Development Of Nbn Based Kinetic Inductance Detectors On Sapphire And Diamond Substrates For Fusion Plasma Polarimetric Diagnostics
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Development Of Nbn Based Kinetic Inductance Detectors On Sapphire And Diamond Substrates For Fusion Plasma Polarimetric Diagnostics
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Author : Mazzocchi, Francesco
language : en
Publisher: KIT Scientific Publishing
Release Date : 2022-07-01
Development Of Nbn Based Kinetic Inductance Detectors On Sapphire And Diamond Substrates For Fusion Plasma Polarimetric Diagnostics written by Mazzocchi, Francesco and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-07-01 with Technology & Engineering categories.
This work aimed at designing, studying and producing the first prototypes of KIDs tailored for fusion plasma polarimetric diagnostics. Diamond was considered for the first time as substrate material for low-temperature superconducting detectors given its unmatched optical, radiation hardness and thermal qualities, properties necessary for working environments potentially saturated with radiation. This work represents a first step toward the optimization and final application of this technology.
Dynamic Model Based Analysis Of Oxygen Reduction Reaction In Gas Diffusion Electrodes
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Author : Röhe, Maximilian
language : en
Publisher: KIT Scientific Publishing
Release Date : 2024-01-09
Dynamic Model Based Analysis Of Oxygen Reduction Reaction In Gas Diffusion Electrodes written by Röhe, Maximilian and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-01-09 with categories.
In this work, the first simulation model of oxygen depolarized cathodes (ODC), which are silver catalyst-based gas diffusion electrodes, is presented that considers the phase equilibrium of the gas-liquid interface and structure-related inhomogeneities in electrolyte distribution. By means of the model it has been identified that mass transport of water and ions in the liquid phase is a crucial factor for electrode performance and how it is influenced by the electrode structure.
Understanding Degradation Phenomena In Solid Oxide Fuel Cell Anodes By Phase Field Modeling And Analytics
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Author : Hoffrogge, Paul Wilhelm
language : en
Publisher: KIT Scientific Publishing
Release Date : 2024-10-09
Understanding Degradation Phenomena In Solid Oxide Fuel Cell Anodes By Phase Field Modeling And Analytics written by Hoffrogge, Paul Wilhelm and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-10-09 with categories.
The current work analyzes degradation effects in solid-oxide fuel cell anodes with the phase-field method. A model extension for interface diffusion is formulated and calibrated. Large-scale 3D-simulations provide interesting insights into phenomena at the microscale which are responsible for the degradation
Application Of Data Mining And Machine Learning Methods To Industrial Heat Treatment Processes For Hardness Prediction
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Author : Lingelbach, Yannick
language : en
Publisher: KIT Scientific Publishing
Release Date : 2024-07-24
Application Of Data Mining And Machine Learning Methods To Industrial Heat Treatment Processes For Hardness Prediction written by Lingelbach, Yannick and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-07-24 with categories.
This work presents a data mining framework applied to industrial heattreatment (bainitization and case hardening) aiming to optimize processes and reduce costs. The framework analyses factors such as material, production line, and quality assessment for preprocessing, feature extraction, and drift corrections. Machine learning is employed to devise robust prediction strategies for hardness. Its implementation in an industry pilot demonstrates the economic benefits of the framework. - This work presents a data mining framework applied to industrial heattreatment (bainitization and case hardening) aiming to optimize processes and reduce costs. The framework analyses factors such as material, production line, and quality assessment for preprocessing, feature extraction, and drift corrections. Machine learning is employed to devise robust prediction strategies for hardness. Its implementation in an industry pilot demonstrates the economic benefits of the framework.
Multiscale Modeling Of Curing And Crack Propagation In Fiber Reinforced Thermosets
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Author : Schöller, Lukas
language : en
Publisher: KIT Scientific Publishing
Release Date : 2024-03-15
Multiscale Modeling Of Curing And Crack Propagation In Fiber Reinforced Thermosets written by Schöller, Lukas and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-03-15 with categories.
During the production of fiber-reinforced thermosets, the resin material undergoes a reaction that can lead to damage. A two-stage polymerization reaction is modeled using molecular dynamics and evaluations of the system including a fiber surface are performed. In addition, a phase-field model for crack propagation in heterogeneous systems is derived. This model is able to predict crack growth where established models fail. Finally, the model is used to predict crack formation during curing.
Steigerung Der Thermischen Stabilit T Von Warm Und Kaltgewalztem Wolfram Durch Kalium Dotierung F R Die Fusionsenergietechnik
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Author : Lied, Philipp
language : de
Publisher: KIT Scientific Publishing
Release Date : 2025-02-11
Steigerung Der Thermischen Stabilit T Von Warm Und Kaltgewalztem Wolfram Durch Kalium Dotierung F R Die Fusionsenergietechnik written by Lied, Philipp and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2025-02-11 with categories.
Kaltgewalztes Wolfram mit hohen Umformgraden zeigt eine außergewöhnlich hohe Duktilität. Die dafür nötige ultrafeinkörnige Mikrostruktur ist jedoch thermisch hochgradig instabil. Ein vielversprechender Stabilisierungsansatz bietet sich durch Kalium-Dotierung an, deren Potential im Rahmen dieser Arbeit umfassend analysiert und qualifiziert wurde. K-dotiertes Wolfram könnte die technischen Möglichkeiten thermisch hochbelasteter Komponenten zukünftiger Fusionsreaktoren entscheidend verbessern. - Cold-rolled tungsten with high degrees of deformation exhibits exceptionally high ductility. However, the required ultra-fine-grained microstructure is thermally unstable. A promising stabilization approach is offered by potassium doping, the potential of which was comprehensively analyzed and qualified as part of this work. K-doped tungsten could significantly improve the technical possibilities for components of future fusion reactors under heavy thermal loads.
Impedanzbasierte Spannungspr Diktion Von Lithium Ionen Batterien
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Author : Hauck, Benjamin
language : de
Publisher: KIT Scientific Publishing
Release Date : 2024-07-03
Impedanzbasierte Spannungspr Diktion Von Lithium Ionen Batterien written by Hauck, Benjamin and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-07-03 with categories.
Diese Arbeit präsentiert ein physikalisch motiviertes Modell, welches die Zellspannung einer Lithium-Ionen-Batterie auf Basis der Zellimpedanz vorhersagt. Das Modell wurde an einer kommerziellen Pouchzelle parametriert und validiert. In einer umfassenden Simulationsstudie wird der Einfluss der Elektrodenmikrostruktur auf die Energie- und Leistungsdichte der Zelle quantifiziert. Darüber hinaus wird eine Routine zur Entwicklung anwendungsspezifischer Zelldesigns vorgestellt. - This work presents a physically motivated model that predicts the cell voltage of a lithium-ion-battery based on its impedance. The model was parameterized and validated on a commercial pouch cell. In a comprehensive simulation study, the influence of the electrode microstructure parameters on the energy and power density is quantified. Furthermore, a routine for the development of application-specific cell designs is developed.
Analyse Und Modellbildung Von Pem Brennstoffzellen Mittels Elektrochemischer Impedanzspektroskopie
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Author : Heinzmann, Marcel
language : de
Publisher: KIT Scientific Publishing
Release Date : 2024-01-24
Analyse Und Modellbildung Von Pem Brennstoffzellen Mittels Elektrochemischer Impedanzspektroskopie written by Heinzmann, Marcel and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-01-24 with categories.
Diese Arbeit präsentiert ein physikalisch motiviertes Modell zur Vorhersage des Strom-/Spannungsverhaltens von PEM-Brennstoffzellen. Durch umfangreiche Impedanzmessungen und DRT-Analysen wurden alle Verlustprozesse identifiziert und quantifiziert. Das entwickelte Modell wurde erfolgreich validiert und bietet Einblicke in die internen Vorgänge der Brennstoffzelle. Es ermöglicht eine gezielte Optimierung und zeigt großes Potenzial für die Leistungssteigerung von PEM-Brennstoffzellen. - This work presents a physically motivated model for predicting the current/voltage behavior of PEM fuel cells. Extensive impedance measurements and DRT analyses were used to identify and quantify all loss processes. The developed model was successfully validated and provides insights into the internal processes of the fuel cell. It enables targeted optimization and shows great potential for increasing the performance of PEM fuel cells.
Herstellung Und Charakterisierung Von Nb Und Ta Al O Verbundwerkstoffen F R Hochtemperaturanwendungen
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Author : Kraft, Bastian
language : de
Publisher: KIT Scientific Publishing
Release Date : 2024-11-08
Herstellung Und Charakterisierung Von Nb Und Ta Al O Verbundwerkstoffen F R Hochtemperaturanwendungen written by Kraft, Bastian and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-11-08 with categories.
Grobkörnige refraktäre Nb-/Ta-Al₂O₃-Verbundwerkstoffe mit mehrskaligem Aufbau sind ein neuartiger Lösungsansatz im Bereich der Hochtemperaturanwendungen. Als Grundlage für die Etablierung dieser Werkstoffe werden in dieser Arbeit mittels Field Assisted Sintering (FAST) hergestellte Verbundwerkstoffe untersucht, um den Einfluss der Materialzusammensetzung und der Partikelgrößenverteilung der Ausgangspulver auf die strukturellen, elektrischen und mechanischen Werkstoffeigenschaften zu analysieren. - Newly designed coarse-grained Nb-/Ta-Al₂O₃ refractory composite materials with multi-scale structure are potential candidates for high-temperature applications. As a basis, this work deals with the synthesis of composites using Field Assisted Sintering (FAST) to get a better understanding of both the influence of material composition and the particle size distribution of the starting powders on structural, electrical and mechanical properties.
Materiell Nichtlineare Kontinuumsmodellierung Ferroelektrischer Funktionskeramiken Mit Piezoelektrischen Und Flexoelektrischen Eigenschaften
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Author : Sutter, Felix
language : de
Publisher: KIT Scientific Publishing
Release Date : 2024-03-15
Materiell Nichtlineare Kontinuumsmodellierung Ferroelektrischer Funktionskeramiken Mit Piezoelektrischen Und Flexoelektrischen Eigenschaften written by Sutter, Felix and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-03-15 with categories.
Die vorliegende Arbeit beschäftigt sich mit der Entwicklung eines makroskopischen Kontinuumsmodells zur Untersuchung des Einflusses des flexoelektrischen Effekts auf mikrostrukturelle Domänenumklappprozesse in ferroelektrischen Funktionskeramiken. Dabei ist von Interesse, ob in Piezokeramiken durch direkte Flexoelektrizität ein Polungsprozess in Gang gesetzt werden kann und ob durch indirekte Flexoelektrizität eine Verbesserung der aktorischen Eigenschaften eines IDE-Wafers möglich ist. - The present work deals with the development of a macroscopic continuum model to investigate the influence of the flexoelectric effect on microstructural domain switching processes in ferroelectric ceramics. It is of interest whether direct flexoelectricity can initiate a poling process in piezoceramics and if indirect flexoelectricity can improve the actuator performance of an IDE wafer.