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This work offers three solutions tailored to specific applications to overcome NMR challenges in the micro-domain. As the first sub-topic of this work, different potential electrode designs, compatible with NMR technique, are suggested and experimentally evaluated. As the second focus point, this work tackles multinuclear detection challenges. In parallel, a low-cost, broadband insert is discussed to enhance the sensitivity of standard NMR coils when a small sample volume is available.
Umfang: XIV, 206 S.
Preis: 45.00 €
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In dieser Arbeit wurden Thermal Grooving Experimente an Anodenmikrostrukturen, Ni-Polykristallen sowie Ni-Bikristallen durchgeführt und die Korngrenzfurchen mittels eines AFM vermessen. Die Ergebnisse liefern erstmals zuverlässige Werte sowie die komplette Anisotropie der relevanten Materialparameter – der relativen Korngrenzenergien und der Oberflächendiffusionskoeffizienten – von Nickel unter realitätsnahen Betriebsbedingungen einer SOFC-Anode.
In this work, thermal grooving experiments were performed on anode microstructures, Ni polycrystals and Ni bicrystals. The grain boundary grooves were measured by means of an AFM. The results provide for the first time reliable values as well as the complete anisotropy of the relevant material parameters - the relative grain boundary energies and the surface diffusion coefficients - of nickel under realistic operating conditions of an SOFC anode.
Umfang: VIII, 133 S.
Preis: 40.00 €
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Diese Arbeit präsentiert einen analytischen und numerischen Modellansatz zur Vorhersage der effektiven Wärmeleitfähigkeit poröser Elektrodenbeschichtungen als Funktion von Mikrostrukturparametern. Beide Modelle berücksichtigen die morphologischen Parameter und die thermischen Bulkeigenschaften der fundamentalen Batteriezellkomponenten. Die Ergebnisse beider Modelle wurden erfolgreich gegeneinander verifiziert und durch Literaturdaten sowie eigene experimentelle Messungen validiert.
This contribution presents an analytical and a numerical model for predicting the effective thermal conductivity of porous electrode coatings as a function of microstructure parameters. Both models account for the morphological parameters and the thermal bulk materials of the constitutive cell components. The results of both models have been successfully verified against each other and validated with literature data as well as own experimental measurements.
Umfang: XV, 252 S.
Preis: 46.00 €
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Dieser Tagungsband enthält die Beiträge des 31. Workshop Computational Intelligence. Die Schwerpunkte sind Methoden, Anwendungen und Tools für Fuzzy-Systeme, Künstliche Neuronale Netze, Evolutionäre Algorithmen und Data-Mining-Verfahren sowie der Methodenvergleich anhand von industriellen und Benchmark-Problemen.
The proceedings of the 31st Workshop on Computational Intelligence focus on methods, applications, and tools for fuzzy systems, artificial neural networks, deep learning, system identification, and data mining techniques.
Umfang: III, 305 S.
Preis: 47.00 €
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Als Fügungen für die Festoxidbrennstoffzelle werden Materialien verwendet, die gasdicht, mechanisch stabil und isolierend sind. In dieser Arbeit wird gezeigt, dass Glaskeramiken als Fügematerial eingesetzt werden können. Es werden lösemittelbasierte und wasserbasierte Suspensionen aus Erdalkali-Silikatglas hergestellt, rheologisch charakterisiert, Schichten mit dem Siebdruckverfahren aufgebracht und anschließend zwischen Stahl- und Keramiksubstraten verlötet.
Solid oxide fuel cells are used to generate electricity from various fuel gases. The sealants between the stack-components should be gas-tight, mechanically stable and insulating. This work shows that glass ceramics can be used as sealant material for fuel cells. Solvent- and water-based suspensions are made from alkaline earth silicate glass and thick layers are produced using the screen-printing process. To demonstrate the applicability, they are soldered between steel and ceramic substrates.
Umfang: X, 201 S.
Preis: 48.00 €
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Fiber-reinforced materials offer a huge potential for lightweight design of load-bearing structures. However, high-volume production of such parts is still a challenge in terms of cost efficiency and competitiveness. Numerical process simulation can be used to analyze underlying mechanisms and to find a suitable process design. In this study, the curing process of the resin is investigated with regard to its influence on RTM mold filling and process-induced distortion.
Umfang: XIX, 253 S.
Preis: 50.00 €
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In this work, initially, the requirements on a simulation model of the non-isothermal stamp forming process of unidirectional fiber-reinforced, and thermoplastic tape laminates are investigated experimentally. On this basis, different isothermal as well as a fully coupled thermomechanical simulation model under consideration of the crystallization kinetics are developed. For validation, a complex shaped geometry is simulated and compared to experimental forming results.
Umfang: XVI, 298 S.
Preis: 54.00 €
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The gas foil bearing (GFB) technology is a key factor for the transition to oil-free rotating machinery. Among numerous advantages, GFBs offer the unique ability to be lubricated with working fluids such as refrigerants. However, the computational analysis of refrigerant-lubricated GFB–rotor systems represents an interdisciplinary problem of enormous complexity. This work pushes forward existing limits of feasibility and establishes a new strategy that enables stability and bifurcation analyses.
Umfang: XXXI, 137 S.
Preis: 54.00 €
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In dieser Arbeit wird der Einfluss der Kompaktierung von LiNi1/3Co1/3Mn1/3O2- und Graphit-basierten Elektroden in einem weiten Porositätsbereich vom unverdichteten Zustand bis Porositäten < 20% elektrochemisch bei Stromraten zwischen C/20 und 5C charakterisiert. Aus den ermittelten Kapazitäten werden u.a. gravimetrische und volumetrische Betrachtungen in Ragone-Plots dargestellt und mit den Erkenntnissen der Mikrostrukturanalyse korreliert.
In this work, the influence of compaction of LiNi1/3Co1/3Mn1/3O2 and graphite-based electrodes is characterized electrochemically at current rates between C/20 and 5C in a wide porosity range from uncompacted states to porosities < 20%. From the determined capacitances, gravimetric and volumetric considerations, among others, are presented in Ragone plots and correlated with the microstructural analysis findings.
Umfang: XVI, 266 S.
Preis: 50.00 €
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Most storage materials exhibit phase changes, which cause stresses and, thus, lead to damage of the electrode particles. In this work, a phase-field model for the cathode material NaxFePO4 of Na-ion batteries is studied to understand phase changes and stress evolution. Furthermore, we study the particle size and SOC dependent miscibility gap of the nanoscale insertion materials. Finally, we introduce the nonlocal species concentration theory, and show how the nonlocality influences the results.
Umfang: XIV, 189 S.
Preis: 44.00 €
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