The German Free State of Saxony has a high density of independent local and regional television broadcasters. From the antenna communities at the time of the GDR, private TV broadcasters developed after the reunification. In the period of the social transformations in the 1990s, these local TV stations documented the profound changes of the everyday life of the individual, of the local communities and the historical transformations in society and economy during the early years after the German reunion. These recordings are a substantial part of the cultural heritage of Saxony and of the highest interest for social, cultural and media research. Due to how the original material was produced on consumer videotapes, today the recordings are threatened by decay. In the next few years the recordings will be lost, if not acted quickly. Some state and private institutions are currently developing concepts for the preservation of the audiovisual heritage in Saxony In this paper, we discuss how these media objects should be scientifically investigated, in the sense of media and sociocultural dimensions, questions and categories. Based on our experiences and investigations, we present a technical concept which shows how to digitalize, index, describe and categorize copious amounts of videotapes for the preservation, archiving and public access of this important part of the cultural heritage of Germany.

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Mass communication through the print and the electronic media has not been spared by the post-Cold-War wind of change that is sweeping across Africa and the rest of the world. According to Wilcox (1974: 37), in 1974 over 70 percent of all the newspapers that were printed in Africa were government-owned; in the same year, almost all radio and T.V. stations were owned by government. In the changing socio-eonomic climate, however, a state monopoly of the mass media in many Sub- Saharan African countries is now a thing of the past (see for instance, Bourgault 1995). Where, for example, there used to be only one or two newspapers owned by the government or the ruling party, there now exists a plethora of privately owned competing newspapers and other publications; and where there used to be only one sycophantic radio and T. V. station owned by the government, there now exist several radio and T. V. stations, many of them privately-owned commercial broadcasters. The general philosophy behind the liberalization of the mass media is what has come to be called `the freedom of speech`. Citing the liberalization of the electronic media in Kenya, this paper argues that the liberalization of the media in many Sub-Saharan countries has not been matched by policies that encourage the entrenchment, spread and full utilization of African indigenous languages. It is further argued that the lack of media policy that favours African indigenous languages is likely to lead to negative consequences for the languages of Africa.

To summarize this entire thesis, MW-assisted spectroscopy has been proposed as a promising approach to investigate the optical properties of VSi and VV spin defects in 4H- and 6H-SiC. The MW-assisted spectroscopy has enabled to separate the spectrally overlapped contribution of different types of defects. From a PL spectrum containing no overlapping spectral contributions of other defects, the local vibrational mode of all measured VSi and VV in 4H- and 6H-SiC has been found along with the phonon energy and DW factor. The interaction of local vibrational modes with point defects has allowed to understand the spin, optical, mechanical, and thermal properties of these defects. In the investigation of V2 in 4H-SiC, a perfect agreement between the experimental data and theoretical calculation have been obtained. The MW-assisted spectra measured at different resonant frequencies associated with the same defect have been found to reveal the same vibrational mode and DW factor. Furthermore, some new ODMR lines to certain defects have been assigned, which have never been reported before. From the investigation of the V2 VSi in 6H-SiC, it has been found that the temperature does not have a clear influence on the DW factor, but high-fluence electron irradiation has been shown to decrease the DW factor. In the polarization investigation, it has been found that in 6H-SiC, V1 possesses no polarization, V2 shows a strong E||c-axis polarization, while V3 exhibits a strong E⊥c-axis polarization. It has also been demonstrated that the temperature and the orientation of the excitation laser have no influence on the photon polarization. In short, this thesis has demonstrated that MW-assisted spectroscopy is a powerful technique to investigate a large number of spin defects in wide-bandgap semiconducting materials.

This thesis considers the Two-Stage Vehicle Routing Problem (VRP) with Profits and Buffers, which generalizes various optimization problems that are relevant for practical applications, such as the Two-Machine Flow Shop with Buffers and the Orienteering Problem. Two optimization problems are considered for the Two-Stage VRP with Profits and Buffers, namely the minimization of total time while respecting a profit constraint and the maximization of total profit under a budget constraint. The former generalizes the makespan minimization problem for the Two-Machine Flow Shop with Buffers, whereas the latter is comparable to the problem of maximizing score in the Orienteering Problem. For the three problems, a theoretical analysis is performed regarding computational complexity, existence of optimal permutation schedules (where all vehicles traverse the same nodes in the same order) and potential gaps in attainable solution quality between permutation schedules and non-permutation schedules. The obtained theoretical results are visualized in a table that gives an overview of various subproblems belonging to the Two-Stage VRP with Profits and Buffers, their theoretical properties and how they are connected. For the Two-Machine Flow Shop with Buffers and the Orienteering Problem, two metaheuristics 2BF-ILS and VNSOP are presented that obtain favorable results in computational experiments when compared to other state-of-the-art algorithms. For the Two-Stage VRP with Profits and Buffers, an algorithmic framework for Iterative Search Algorithms with Variable Neighborhoods (ISAVaN) is proposed that generalizes aspects from 2BF-ILS as well as VNSOP. Various algorithms derived from that framework are evaluated in an experimental study. The evaluation methodology used for all computational experiments in this thesis takes the performance during the run time into account and demonstrates that algorithms for structurally different problems, which are encompassed by the Two-Stage VRP with Profits and Buffers, can be evaluated with similar methods. The results show that the most suitable choice for the components in these algorithms is dependent on the properties of the problem and the considered evaluation criteria. However, a number of similarities to algorithms that perform well for the Two-Machine Flow Shop with Buffers and the Orienteering Problem can be identified. The framework unifies these characteristics, providing a spectrum of algorithms that can be adapted to the specifics of the considered Vehicle Routing Problem.:1 Introduction 2 Background 2.1 Problem Motivation 2.2 Formal Definition of the Two-Stage VRP with Profits and Buffers 2.3 Review of Literature on Related Vehicle Routing Problems 2.3.1 Two-Stage Vehicle Routing Problems 2.3.2 Vehicle Routing Problems with Profits 2.3.3 Vehicle Routing Problems with Capacity- or Resource-based Restrictions 2.4 Preliminary Remarks on Subsequent Chapters 3 The Two-Machine Flow Shop Problem with Buffers 3.1 Review of Literature on Flow Shop Problems with Buffers 3.1.1 Algorithms and Metaheuristics for Flow Shops with Buffers 3.1.2 Two-Machine Flow Shop Problems with Buffers 3.1.3 Blocking Flow Shops 3.1.4 Non-Permutation Schedules 3.1.5 Other Extensions and Variations of Flow Shop Problems 3.2 Theoretical Properties 3.2.1 Computational Complexity 3.2.2 The Existence of Optimal Permutation Schedules 3.2.3 The Gap Between Permutation Schedules an Non-Permutation 3.3 A Modification of the NEH Heuristic 3.4 An Iterated Local Search for the Two-Machine Flow Shop Problem with Buffers 3.5 Computational Evaluation 3.5.1 Algorithms for Comparison 3.5.2 Generation of Problem Instances 3.5.3 Parameter Values 3.5.4 Comparison of 2BF-ILS with other Metaheuristics 3.5.5 Comparison of 2BF-OPT with NEH 3.6 Summary 4 The Orienteering Problem 4.1 Review of Literature on Orienteering Problems 4.2 Theoretical Properties 4.3 A Variable Neighborhood Search for the Orienteering Problem 4.4 Computational Evaluation 4.4.1 Measurement of Algorithm Performance 4.4.2 Choice of Algorithms for Comparison 4.4.3 Problem Instances 4.4.4 Parameter Values 4.4.5 Experimental Setup 4.4.6 Comparison of VNSOP with other Metaheuristics 4.5 Summary 5 The Two-Stage Vehicle Routing Problem with Profits and Buffers 5.1 Theoretical Properties of the Two-Stage VRP with Profits and Buffers 5.1.1 Computational Complexity of the General Problem 5.1.2 Existence of Permutation Schedules in the Set of Optimal Solutions 5.1.3 The Gap Between Permutation Schedules an Non-Permutation Schedules 5.1.4 Remarks on Restricted Cases 5.1.5 Overview of Theoretical Results 5.2 A Metaheuristic Framework for the Two-Stage VRP with Profits and Buffers 5.3 Experimental Results 5.3.1 Problem Instances 5.3.2 Experimental Results for O_{max R, Cmax≤B} 5.3.3 Experimental Results for O_{min Cmax, R≥Q} 5.4 Summary Bibliography List of Figures List of Tables List of Algorithms

Die vorliegende kumulative Arbeit untersucht, inwiefern lokale Aushandlungsprozesse im Umgang mit extrem rechten Mobilisierungen zu deren Normalisierung beitragen. Die Studie adressiert zwei Forschungsdesiderate: Erstens externalisieren viele Beiträge die extrem Rechte von städtischen Demokratien. Folglich ist die Literatur nicht in der Lage zu erfassen, wie extrem rechte Agenden und Ideologien innerhalb lokaler partizipativer Prozesse in liberalen Demokratien normalisiert werden. Zweitens sind die Akteure und Prozesse, welchen diesen lokalen Aushandlungen zugrunde liegen, nicht ausreichend untersucht. Um diese Lücken zu schließen, verbindet die Studie Theoriestränge aus der Urban Governance - Literatur mit sozialwissenschaftlichen Debatten über den Aufstieg der extrem Rechten. Der methodische Rahmen der Arbeit besteht aus einem qualitativen Forschungsdesign in Form einer explorativen Einzelfallstudie in der Stadt Cottbus. Die Analyse zeigt, dass das Narrativ der Externalisierung in dreierlei Hinsicht eine falsche Dichotomie zwischen der extremen Rechten und lokalen Aushandlungsprozessen schafft: Erstens ignoriert es, dass deliberative Prozessen zwar das Versprechen auf Demokratisierung innewohnt, dieses aber durch bestehende gesellschaftliche Machtverhältnisse durchkreuzt wird, die Näherböden für autoritäre Mobilisierung bieten können. Zweitens übersieht es die Verflechtung zwischen Rassismus und den städtischen Institutionen, die auf extrem rechte Mobilisierung reagieren, und oftmals Anknüpfungspunkte für extrem rechte Ideologien bieten. Drittens wird argumentiert, dass dies auf den lokalen Staat als umkämpftes Terrain hinweist. / This doctoral dissertation explores to what extent local negotiations of far-right contestations contribute to the latter’s normalisation. The project is prompted by the crux that even though the central role of cities and local participatory planning processes in countering far-right contestations is widely acknowledged, far-right contestations have hardly been challenged. It seeks to address two scholarly blind spots: First, mainstream accounts engaging with the question of how municipalities deal with far-right contestations have largely externalised the far right from urban democracy. Consequently, the current literature is not able to grasp how far-right agendas and ideologies can indeed be normalised within local participatory processes. Second, the actors and processes involved in the local negotiation of far-right contestations remain understudied. To fill these gaps, the cumulative dissertation connects discussions on urban governance with recent debates on the rise of the far right. The methodological framework of this thesis consists of a qualitative, explorative single-case study in the city of Cottbus, Germany. The analysis reveals that the liberal narratives of externalisation create a false dichotomy between far-right contestations and local negotiations in liberal democracies in a threefold way. First, they ignore how far-right contestations can be strengthened within traditional deliberative processes, as their promise of equal participation for all citizens is juxtaposed with the inability of such processes to re-negotiate the power relations aggravating the social inequalities giving rise to the far right in the first place. Second, by externalising the divisiveness propagated by far-right contestations, they overlook the interconnectedness between racism and the institutions governing cities, which offers points of contact for far-right ideology. Third, it is argued that this points to the local state as contested terrain.

Dieser Artikel enthält vier Kapitel. Das erste Kapitel ist berechtigt, '''' lokalen Quantil Regression"und seine Zusammenfassung: Quantil Regression ist eine Technik, bedingte Quantil Kurven zu schätzen. Es bietet ein umfassendes Bild über ein Antwort-Kontingent auf erklärenden Variablen. In einem Rahmen flexible Modellierung ist eine besondere Form der bedingten Quantil-Kurve nicht von vornherein festgelegt. Dies motiviert eine lokale parametrische anstatt einer globalen feste Modell passend Ansatz. Eine nichtparametrische Glättung Schätzung der bedingte Quantil Kurve erfordert, zwischen lokalen Krümmung und stochastische auszugleichen Variabilität. In den ersten Essay empfehlen wir eine lokale Modellauswahl Technik, die eine adaptive Schätzung der bedingte bietet Quantil-Regression-Kurve bei jedem Entwurf-Punkt. Theoretische Ergebnisse behaupten, dass das vorgeschlagene adaptive Verfahren als führt gut als Orakel die würde das Risiko der lokalen Abschätzung für die Aufgabenstellung minimieren. Wir veranschaulichen die Leistung der Trolle. / This article includes four chapters. The first chapter is entitled ``Local Quantile Regression", and its summary: Quantile regression is a technique to estimate conditional quantile curves. It provides a comprehensive picture of a response contingent on explanatory variables. In a flexible modeling framework, a specific form of the conditional quantile curve is not a priori fixed. This motivates a local parametric rather than a global fixed model fitting approach. A nonparametric smoothing estimate of the conditional quantile curve requires to balance between local curvature and stochastic variability. In the first essay, we suggest a local model selection technique that provides an adaptive estimate of the conditional quantile regression curve at each design point. Theoretical results claim that the proposed adaptive procedure performs as good as an oracle which would minimize the local estimation risk for the problem at hand. We illustrate the performance of the procedure by an extensive simulation study and consider a couple of applications: to tail dependence analysis for the Hong Kong stock market and to analysis of the distributions of the risk factors of temperature dynamics.

In dieser Arbeit wird eine unrestricted Coupled-Cluster CC2 Response-Methode für die Berechnung von Eigenschaften erster und zweiter Ordnung, mit dem elektronischen g-Tensor als Schwerpunkt, präsentiert. Lokale Korrelations- und Dichtefittingnäherungen wurden verwendet. Die fundamentalen Konzepte notwendig für das Verständnis von Coupled-Cluster-Theorie, Dichtefitting, lokaler Korrelation, allgemeinen Coupled-Cluster Eigenschaften und dem elektronischen g-Tensor werden diskutiert. Die berechneten g-Tensoren werden mit denen durch Coupled-Cluster Singles and Doubles, Dichtefunktionaltheorie und Experiment erhaltenen verglichen. Effizienz und Genauigkeit der Näherung wird untersucht. Ein detailierter Anhang beschreibt die diagrammatische Coupled-Cluster-Theorie sowie ihre Anwendung zur Herleitung der verwendeten Arbeitsgleichungen. Die in dieser Arbeit entwickelte Methode ermöglicht es, den elektronischen g-Tensor von ausgedehnten Systemen mit einer Methode, die nicht auf Dichtefunktionaltheorie basiert, quantitativ vorherzusagen. Damit ist sie ein wichtiger Schritt hin zur Entwicklung von niedrig skalierenden Coupled-Cluster-Methoden höherer Ordnung für diese Art von Problem. / This work presents an unrestricted coupled-cluster CC2 response method using local correlation and density fitting approximations for the calculation of first and second order properties with particular focus on the electronic g-tensor. The fundamental concepts related to coupled-cluster theory, density fitting, local correlation, general coupled-cluster properties and the electronic g-tensor are discussed. The calculated g-tensors are benchmarked against those obtained from coupled-cluster singles and doubles, density functional theory and experiment. Efficiency and accuracy of the approximations is investigated. A detailed appendix covers the fundamentals of diagrammatic coupled-cluster and its application to the derivation of the working equations. The method presented in this thesis enables the quantitative prediction of the electronic g-tensor of extended systems with a method other than density functional theory. It represents an important step towards the development of low-scaling higher order coupled-cluster methods for this type of problem.

In dieser Arbeit wird eine unrestricted Coupled-Cluster CC2 Response-Methode für die Berechnung von Eigenschaften erster und zweiter Ordnung, mit dem elektronischen g-Tensor als Schwerpunkt, präsentiert. Lokale Korrelations- und Dichtefittingnäherungen wurden verwendet. Die fundamentalen Konzepte notwendig für das Verständnis von Coupled-Cluster-Theorie, Dichtefitting, lokaler Korrelation, allgemeinen Coupled-Cluster Eigenschaften und dem elektronischen g-Tensor werden diskutiert. Die berechneten g-Tensoren werden mit denen durch Coupled-Cluster Singles and Doubles, Dichtefunktionaltheorie und Experiment erhaltenen verglichen. Effizienz und Genauigkeit der Näherung wird untersucht. Ein detailierter Anhang beschreibt die diagrammatische Coupled-Cluster-Theorie sowie ihre Anwendung zur Herleitung der verwendeten Arbeitsgleichungen. Die in dieser Arbeit entwickelte Methode ermöglicht es, den elektronischen g-Tensor von ausgedehnten Systemen mit einer Methode, die nicht auf Dichtefunktionaltheorie basiert, quantitativ vorherzusagen. Damit ist sie ein wichtiger Schritt hin zur Entwicklung von niedrig skalierenden Coupled-Cluster-Methoden höherer Ordnung für diese Art von Problem. / This work presents an unrestricted coupled-cluster CC2 response method using local correlation and density fitting approximations for the calculation of first and second order properties with particular focus on the electronic g-tensor. The fundamental concepts related to coupled-cluster theory, density fitting, local correlation, general coupled-cluster properties and the electronic g-tensor are discussed. The calculated g-tensors are benchmarked against those obtained from coupled-cluster singles and doubles, density functional theory and experiment. Efficiency and accuracy of the approximations is investigated. A detailed appendix covers the fundamentals of diagrammatic coupled-cluster and its application to the derivation of the working equations. The method presented in this thesis enables the quantitative prediction of the electronic g-tensor of extended systems with a method other than density functional theory. It represents an important step towards the development of low-scaling higher order coupled-cluster methods for this type of problem.

Diese Dissertation umfasst vier Essays, die einen Beitrag zur empirischen Literatur über die Determinanten der Veränderungen in der Beschäftigungs- und Lohnstruktur in Deutschland leisten. Im ersten Aufsatz wird der Zusammenhang zwischen technologischem Wandel und Wachstum von Beschäftigung am unteren Ende der Lohnverteilung untersucht. Eine ökonometrische Analyse zeigt, dass technologischer Wandel die Arbeitsnachfrage von routine-intensiven Berufen hin zu Berufen verschiebt, die niedrig entlohnte manuelle Tätigkeiten erfordern und sich nicht zur Substitution durch Informationstechnologien eignen. Damit trägt er zur Polarisierung der Beschäftigungsstrukturen bei. Der zweite Aufsatz untersucht die Rolle von technologischem Wandel in der Entstehung räumlicher Lohnungleichheiten. Es wird gezeigt, dass technologischer Wandel zu einem Zuwachs in der Entlohnung von nicht-routine kognitiven Tätigkeiten und zu einem Rückgang der Entlohnung für routine und nicht-routine manuelle Tätigkeiten führte und damit zur Vergrößerung der inter- und intra-regionalen Lohnungleichheit beitrug. Der dritte Aufsatz untersucht die Beschäftigungswirkung von Produktmarktderegulierung am Beispiel der Liberalisierung der Ladenschlussgesetze, wobei regionale Variation in der Gesetzgebung zur Identifikation des kausalen Effekts dient. Es wird gezeigt, dass die Beschäftigung im Einzelhandel durch die Deregulierung um etwa 19.000 vollzeitäquivalente Stellen zurückging. Dem zugrunde liegt ein signifikanter Rückgang an kleinen Unternehmen, die personalintensiver arbeiten als große Unternehmen. Im vierten Aufsatz werden die Auswirkungen von öffentlicher Beschäftigung auf die Beschäftigung im Privatsektor untersucht. Ergebnis ist, dass die Schaffung öffentlicher Beschäftigung erhebliche Verdrängungseffekte auf die Gesamtbeschäftigung im Privatsektor hat, wobei hauptsächlich der handelbare Sektor von Beschäftigungsverlusten betroffen ist. / This thesis consists of four essays that contribute to the empirical literature on the determinants of recent changes in the employment and wage structure in Germany. The first essay analyzes recent employment growth at the lower tail of the wage distribution and its relation to technological progress. An econometric analysis suggests that tech-nological progress has shifted the demand from routine intensive occupations towards low-paying service occupations that require non-routine manual tasks, which are difficult to be replaced by information technologies, thereby contributing to the polarization of the employment structure. The second essay explores the role of technological change in the evolution of spatial wage inequality. The results indicate technological change is one driver of wage inequality by increasing the compensation for non-routine cognitive tasks, and by decreasing the compensation for routine and non-routine manual tasks. The third essay exploits regional variation in the liberalization of shop-closing legislation in Germany to identify the causal impact of product market deregulation on employment outcomes in the retail sector. The results from the empirical analysis suggest that the deregulation had moderately negative effects on retail employment, leading to a loss of approximately 19,000 full-time equivalent jobs. The reason is that deregulation induced a change in the market structure by significantly decreasing the number of small retail stores which are relatively more personnel-intensive than larger formats. The fourth essay provides an empirical analysis of the impact of changes in public sector employment on employment in the private sector at the level of local labor markets. It shows that expansions in public employment can be associated with a sizeable crowding out effect on private sector employment. Moreover, the results indicate that employment losses are concentrated in the tradable sector.