Publications

Since its introduction, the European Emissions Trading Scheme (EU ETS) has been struggling with an oversupply of emission allowances and a highly volatile allowance price. One reason for the price decline is technological progress and ist demand-reducing effect, which is only partially taken into account in the system. We propose a simple benchmark approach to endogenously adjust the supply of allowances to technical progress. Using a non-parametric benchmark approach, we measure the required adjustment of the allowance supply to avoid a technologyinduced price decline and to maintain the incentive to invest in low-carbon technologies.

This study investigates news sourcing practices in climate change reporting in Indonesia, a country that contributes significant carbon emissions and is among the world’s most vulnerable nations in the face of climate crises. This paper examines two types of news sources: sources in the form of persons or actors whom journalists ask for information and sources in the form of international news flows from news wires and international media organizations. Through qualitative study using semi-structured interviews with 14 journalists and two editors-in-chief, I found three types of news sourcing practices that are currently adopted: news sourcing practices that use national actors as the main source; practices that use international news sources as cognitive inventory; and practices that rely on the international news flow. These practices are highly influenced by audience needs, the internet algorithm, and the news platforms for which the journalists work. The analysis also elucidates the transnational cooperation practices of several foreign public broadcasts in Indonesia.

In our study, we examine how category density affects entrepreneurs? propensity to engage in category spanning, and investigate the moderating effects of category fuzziness, regional density, and the number of entrants in a system of categories. We test our hypotheses by focusing on 3707 bands in the British metal music industry. Our findings indicate that increased category density reduces the degree of category spanning, but this effect is attenuated by increased category fuzziness and an increase in the number of new ventures founded in the same market. Regional density has no moderating effect, but its positive main effect points to the independence of the effects of categorical and regional density on category spanning. Our findings facilitate theory building regarding the antecedents of category spanning and the evolution of the categorical system of markets.

Teil 1: Grundlagen der quantitativen Unternehmensplanung. Grundfragen der Planung -- Quantitative Planung im Unternehmen -- Teil 2: Optimierungsmodelle und Optimierungsmethoden. Lineare Optimierung. Ganzzahlige Optimierung -- Nichtlineare Optimierung -- Teil 3: Projektplanung und Netzplantechnik. Graphentheoretische Grundlagen -- Grundbegriffe und Darstellungsformen für Netzpläne -- Zeitplanung mit Vorgangsknotennetzen -- Zeitplanung mit Vorgangspfeilnetzen -- Optimale Flüsse in Digraphen -- Planung von Projektkosten -- Teil 4: Stochastische Modelle. Homogene Markovketten -- Warteschlangen -- Lagerhaltungsmodelle -- Teil 5: Nichtexakte Lösungsverfahren. Heuristische Verfahren -- Simulation -- Literaturverzeichnis -- Stichwortverzeichnis.

Mit „Evaluationsforschung“, „wissenschaftlicher Evaluation“ oder kurz „Evaluation“ ist die Bewertung eines Gegenstandes mit Hilfe sozialwissenschaftlicher Methoden durch Evaluationsfachleute gemeint (Widmer/De Rocchi 2012: 11). Die Evaluationsforschung ist ein boomendes interdisziplinäres Forschungsfeld, in dem sowohl qualitative als auch quantitative Methoden der empirischen Sozialforschung zum Einsatz kommen (Döring 2022). In zahlreichen Bereichen des öffentlichen Lebens werden Evaluationsmaßnahmen inzwischen rechtlich vorgeschrieben.