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Strong winds accompanying extratropical cyclones are commonly associated with various mesoscale features. This work introduces RAMEFI (RAndom-forest-based Mesoscale wind Feature Identification), an objective and flexible identification approach based on key surface characteristics to distinguish these features. RAMEFI is further applied to compile a climatology over Europe, offering a comprehensive analysis of feature frequency, distribution, and characteristics.
Umfang: XIV, 186 S.
Preis: 42.00 €
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This work presents a single molecular motor driven by the current in an STM. Its chiral functional group is supposed to perform a rotation in a preferred direction, proven by Binomial tests to be statistically significant.
The rotation is proposedly driven by the chiral-induced spin selectivity effect (CISS). However, the studies of the rotation on the dependence on the lateral tip position, voltage and current indicate that he CISS is unlikely to cause the preferred rotation direction.
Umfang: II, 148 S.
Preis: 49.00 €
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In the last decades, superconducting devices have emerged as a promising platform for quantum technologies, including quantum sensing and quantum computing. Their key elements are Josephson junctions, which allow for coherent supercurrent tunneling between two weakly linked superconductors. If such a junction is extended in one direction to a long junction, the superconducting phase difference can vary in space and time and may allow for quantized phase windings that drive supercurrent vortices.
Umfang: II, 145 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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Warm conveyor belts (WCBs) are weather systems that substantially modulate the large-scale extratropical circulation. As they can amplify forecast errors and project them onto the Rossby wave pattern, they are of high relevance for numerical weather prediction. This work elaborates on two aspects of WCBs in the context of ensemble forecasts: (1) sensitivities of WCBs to the representation of initial condition and model uncertainties, and (2) the role of WCBs for forecast error growth.
Umfang: XIII, 214 S.
Preis: 46.00 €
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Complementary to scattering techniques, scanning tunnelling microscopy provides atomic-scale real space information about a material's electronic state of matter. State-of-the-art designs of a scanning tunnelling microscope (STM) allow measurements at millikelvin temperatures with unprecedented energy resolution. Therefore, this instrument excels in probing the superconducting state at low temperatures and especially its local quasiparticle excitations as well as bosonic degrees of freedom.
Umfang: III, 190 S.
Preis: 49.00 €
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In this work, a clear pathway is presented to achieve well-defined electronically decoupled chromophores from metallic leads without requiring additional insulating layers. To study such self-decoupled molecules, STM equipped with an efficient light detection setup has been used. Results show that the chromophores mounted on tripodal molecular platforms adsorbed on a gold surface present well-defined and efficient electroluminescence down to the single-molecule level.
Umfang: IV, 130 S.
Preis: 50.00 €
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Präzise Warnungen vor den Begleiterscheinungen von Gewittern sind für Präventionsmaßnahmen unerlässlich. Die dynamische Entwicklung von Gewitterzellen führt oft zu einer großen Diskrepanz zwischen den Echtzeit-Vorhersagen der Wetterdienste und den beobachteten Wetterbedingungen. Daten eines Zellverfolgungsalgorithmus werden mit Modellanalysen kombiniert, um den Lebenszyklus von Gewittern in Deutschland zu analysieren und Verfahren für die Echtzeit-Vorhersage zu entwickeln und zu evaluieren.
Precise warnings of the accompanying effects of thunderstorms are essential for preventive measures. The dynamic development of thunderstorm cells often leads to a large discrepancy between the real-time forecasts (nowcasts) of weather services and the observed weather conditions. Data from a cell tracking algorithm are combined with model analyses to investigate the life cycle of thunderstorms in Germany and to develop and evaluate procedures useful for thunderstorm nowcasting.
Umfang: VI, 398 S.
Preis: 56.00 €
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The annual report of the Institute for Thermal Energy Technology and Safety of KIT summarizes its research activities and provides some highlights of each working group, like thermal-hydraulic analyses for fusion reactors, accident analyses for light water reactors, and research on innovative energy technologies: liquid metal technologies for energy conversion, hydrogen technologies and geothermal power plants. The institute has been engaged in education and training in energy technologies.
Umfang: II, 80 S.
Preis: 43.00 €
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Die Hochtemperatur-Brennstoffzelle (SOFC) als Strom- und Wärmeproduzent der Zukunft stellt eine wichtige Schlüsseltechnologie für eine klimafreundliche Energieversorgung dar. Vorrangige Entwicklungsziele sind die Verbesserung der Lebensdauer und die Verringerung der Kosten der SOFC-Komponenten. In dieser Arbeit werden mikrostrukturelle Veränderungen, die während der Zellherstellung und im Betrieb (Alterungsverlauf) auftreten, durch den Einsatz mehrskaliger Untersuchungsmethoden identifiziert.
The solid oxide fuel cell (SOFC) as electricity and heat producer of the future represents a key technology in the context of a climate-friendly energy supply. Research focuses on the improvement of the lifetime and cost reduction of the SOFC components. In this work, microstructural changes that occur during cell production and operation (aging process) are identified by multiscale examination methods.
Umfang: XI, 209 S.
Preis: 59.00 €
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