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This cumulative habilitation thesis, proposes concepts for (i) modelling and analysing dependability based on architectural models of software-intensive systems early in development, (ii) decomposition and composition of modelling languages and analysis techniques to enable more flexibility in evolution, and (iii) bridging the divergent levels of abstraction between data of the operation phase, architectural models and source code of the development phase.
Umfang: XI, 126 S.
Preis: 37.00 €
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Modern production systems have become more flexible and agile. For them, a suitable control and planning method is needed. Agent-based systems offer the required characteristics. The contributions of these work are a remodeling of the Shifting Bottleneck heuristic to include limited buffers, the development of a decentralized multi-agent system for production planning, and the adaptation of the heuristic to the agent system. It concludes with evaluations of real-world production systems.
Umfang: IX, 187 S.
Preis: 48.00 €
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The object-based stochastic approach in facies modelling is important in the construction of geologically consistent 3-D reservoir models and in constraining the distribution of petrophysical properties. Tortuosity factor, facies, porosity and cementation factor constitute major uncertainties in the generated 3-D static model of the Niger Delta Basin. Reservoir quality in the Dahomey Basin is mainly controlled by detrital matrix, carbonate cement, and iron oxide and iron oxyhydroxide cements.
Umfang: XI, 158 S.
Preis: 46.00 €
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The research deals with a question about Architecture and its design strategies, combining historical information and digital tools. Design strategies are historically defined, they rely on geometry, context, building technologies and other factors. The study of Architecture´s own history, particularly in the verge of technological advancements, like the introduction of new materials or tools may shed some light on how to internalize digital tools like parametric design and digital fabrication.
Umfang: III, 562 S.
Preis: 45.00 €
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This study systematically investigates the representation of warm conveyor belts (WCBs) in large reforecast data sets of different numerical weather prediction models and evaluates the role of WCBs for the onset and life cycle of Atlantic-European weather regimes. The results emphasize the importance of accurate forecast of WCBs for sub-seasonal prediction on time scales beyond two weeks and tie the low forecast skill of blocked weather regimes over Europe to misrepresented WCBs.
Umfang: XIII, 220 S.
Preis: 48.00 €
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The state of the art in the optical characterization of materials is advancing rapidly. New insights have been gained into the theoretical foundations of this research and exciting developments have been made in practice, driven by new applications and innovative sensor technologies that are constantly evolving.
Umfang: VII ,178 S.
Preis: 44.00 €
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Scheinbar losgelöst von Mobilitätsalternativen in Städten besitzt das Auto immer noch eine hohe Relevanz bei der persönlichen Mobilität. Um die Rolle des Autos zu untersuchen, wird ein Erhebungskonzept zur mehrdimensionalen Betrachtung urbaner Mobilität vorgestellt: das Mobilitätsskelett. Der modulare Aufbau verbindet die Erhebung der Alltagsmobilität in einer typischen Woche mit seltenen Fernverkehrsereignissen als Quasi-Längsschnitt und ermöglicht die Erfassung psychographischer Eigenschaften.
Seemingly detached from attractive mobility alternatives in cities the car remains highly relevant in personal mobility. In order to investigate the role of the car, a new survey concept for a multidimensional analysis of urban mobility is presented: the travel skeleton. The modular design combines the collection of everyday trips in a typical week with occasional long-distance trips in a quasi-longitudinal approach. The concept also captures associated psychographic characteristics.
Umfang: XXII, 404 S.
Preis: 52.00 €
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Carsharing kann wesentlich zur Reduzierung privater PKW beitragen. Dennoch verharrt es in der Nische. Die vorliegende Arbeit sucht nach den Gründen des Nischendaseins und dies mit Fokus auf unterschiedliche Stakeholdergruppen. Neben der Darstellung der Einflusswirkungen sowie deren Einordnung und Auswertung auf der Grundlage des Stakeholder Salience Modell von Mitchell et al. gibt der Autor Handlungsempfehlungen, wie es zu einer Ausweitung des Carsharing in Deutschland kommen kann.
Car sharing can contribute significantly to reducing the number of private cars. Nevertheless, it remains in the niche. This work looks for the reasons for this niche existence and does so with a focus on different stakeholder groups. In addition to the presentation of the effects of influence as well as their classification and evaluation on the basis of the Stakeholder Salience Model by Mitchell et al., the author gives recommendations for action on how an expansion of car sharing in Germany can be achieved.
Umfang: IX, 374 S.
Preis: 68.00 €
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Im Rahmen dieser Arbeit werden Siliziumnitrid–/Siliziumkarbidkompositwerkstoffe für tribologisch hochbeanspruchte Anwendungen entwickelt und charakterisiert. Bei der Charakterisierung der Kompositwerkstoffe wird der Zusammenhang zwischen dem Siliziumkarbidgehalt und der entstehenden Mikrostruktur sowie den mechanischen Eigenschaften dargestellt. Tribologisch wurden die Werkstoffe in Modellversuchen untersucht. Dabei zeigten sie ein sehr gutes Reib- und Verschleißverhalten.
In this work, silicon nitride/silicon carbide composites are manufactured and characterized for tribologically highly stressed applications. The characterization of the composite materials shows the influence of the silicon carbide content on the resulting microstructure and the mechanical properties. The friction properties of the composite materials were characterized in tribological experiments. The composites show very good friction and wear behavior.
Umfang: XX, 185 S.
Preis: 45.00 €
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In this work a process simulation model identifies the most profitable German biogas plant types and sizes. Small manure and large-scale biowaste plants are currently the most economically attractive installations whereas the valorization of energy crops turns out to be unprofitable. Future developments are assessed with the help of a regional optimization model under constraints. Capacity expansion concerns small-scale manure and biowaste installations rather than plants based on energy crops.
Umfang: XXIII, 330 S.
Preis: 53.00 €
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