Nanoskalige Analytik Der Mikrostruktur Von Hochdosig Bestrahltem Beryllium
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Nanoskalige Analytik Der Mikrostruktur Von Hochdosig Bestrahltem Beryllium
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Author : Zimber, Nikolai
language : de
Publisher: KIT Scientific Publishing
Release Date : 2022-07-12
Nanoskalige Analytik Der Mikrostruktur Von Hochdosig Bestrahltem Beryllium written by Zimber, Nikolai 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 2022-07-12 with Technology & Engineering categories.
In dieser Arbeit wurden die mikrostrukturellen Veränderungen von neutronenbestrahltem Beryllium im Transmissionselektronenmikroskop analysiert. Mit Hilfe der Elektronenenergieverlustspektroskopie konnten zum ersten Mal sowohl Helium als auch Wasserstoff innerhalb von nanoskaligen Blasen quantifiziert werden. Darüber hinaus wurde gezeigt, wie die Tritiumrückhaltung mittels einfach zu bestimmender experimenteller Daten abgeschätzt werden kann. - The aim of the present work is to develop an in-depth understanding of the microstructural changes in neutron-irradiated beryllium. In particular, it aims to reveal the precise mechanisms leading to the observed tritium retention.Both, helium and tritium could be detected for the first time by high-resolution electron energy loss spectroscopy (EELS) within bubbles in the grain interior as well as along grain boundaries.
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.
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.
Entwicklung Und Charakterisierung Von Siliziumnitrid Siliziumkarbidkompositen F R Den Einsatz In Tribologisch Hochbeanspruchten Gleitsystemen
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Author : Zielonka, Paul S.
language : de
Publisher: KIT Scientific Publishing
Release Date : 2023-05-15
Entwicklung Und Charakterisierung Von Siliziumnitrid Siliziumkarbidkompositen F R Den Einsatz In Tribologisch Hochbeanspruchten Gleitsystemen written by Zielonka, Paul S. 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 2023-05-15 with Technology & Engineering categories.
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.
Numerische Modellierung Und Simulation Von Bleifreien Relaxor Ferroelektrikum Kompositen
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Author : Streich, Friedemann
language : de
Publisher: KIT Scientific Publishing
Release Date : 2023-03-24
Numerische Modellierung Und Simulation Von Bleifreien Relaxor Ferroelektrikum Kompositen written by Streich, Friedemann 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 2023-03-24 with Technology & Engineering categories.
Das elektromechanische Verhalten zweier neu entwickelten, auf Natrium-Bismut-Titanat basierenden bleifreier Ferroelektrika sowie daraus bestehenden Zweilagenkompositen wird durch Experimente und numerische Simulationen untersucht. Für die Finite-Elemente-Methode wird hierzu ein dreidimensionales, vollständig elektromechanisch gekoppeltes Materialmodell entwickelt. An Hand einer Parameterstudie werden die elektromechanischen Kopplungseigenschaften der Zweilagenkomposite optimiert. - The electromechanical behavior of two new sodium bismuth titanate based lead-free ferroelectric materials as well as bilayer composites are investigated in experiments and numerical simulations. For the Finite-Element-Method, a fully coupled, three dimensional ferroelectric constitutive model is developed. In a parameter study, the electromechanical coupling of bilayer composite is optimized.
Phasenfeldmodellierung Von Bruchbildungs Kristallisations Und Aufl Sungsvorg Ngen In Hydrothermalen Umgebungen
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Author : Späth, Michael
language : de
Publisher: KIT Scientific Publishing
Release Date : 2022-12-09
Phasenfeldmodellierung Von Bruchbildungs Kristallisations Und Aufl Sungsvorg Ngen In Hydrothermalen Umgebungen written by Späth, Michael 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 2022-12-09 with Technology & Engineering categories.
In dieser Arbeit werden Bruchbildungs-, Kristallisations- und Kristallauflösungsprozesse in unterirdischen hydrothermalen Umgebungen auf Mikroebene numerisch untersucht. Für die Abbildung dieser Prozesse werden Phasenfeld-Modelle vorgestellt. Es werden Bildungsprozesse von Mineraladern in Kalksteinen und in quarzreichen Mikrostrukturen und Auflösungsprozesse von verschiedenen Mineralen modelliert, wobei verschiedene Einflussfaktoren auf die sich bildenden Kristallstrukturen untersucht werden. - This work focuses on the numerical investigation of fracture formation, crystallization, and crystal dissolution processes in subsurface hydrothermal environments on microscale. Phase-field models are presented and applied to these processes. The formation of mineral veins in limestones and in quartz-rich microstructures are modeled to investigate different factors which influence the evolving crystal structure. Moreover, crystal dissolution processes of different minerals are modeled.
Der Spr D Duktil Bergang In Ultrafeink Rnigem Wolfram
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Author : Bonnekoh, Carsten
language : de
Publisher: KIT Scientific Publishing
Release Date : 2023-09-05
Der Spr D Duktil Bergang In Ultrafeink Rnigem Wolfram written by Bonnekoh, Carsten 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 2023-09-05 with categories.
Hohe Spröd-duktil-Übergangstemperaturen schließen den Einsatz von konventionell gefertigtem Wolfram (W) als Strukturwerkstoff aus. Ultrafeinkörnige (UFG) W-Werkstoffe zeigen jedoch den Spröd-duktil-Übergang bereits bei sehr tiefen Temperaturen und weisen folglich Raumtemperaturduktilität auf. Die korrelative Mikrostrukturanalyse offenbarte einen starken Zusammenhang zwischen der Übergangstemperatur und dem mittleren Korngrenzenabstand entlang der Rissfront. - High brittle-ductile transition temperatures preclude the use of conventionally manufactured tungsten (W) as a structural material. Ultrafine grained (UFG) W materials, however, exhibit the brittle-ductile transition at very low temperatures and consequently exhibit room-temperature ductility. The correlative microstructure analysis revealed a strong correlation between the transition temperature and the mean grain boundary spacing along the crack front.
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.
Multiskalige Modellierung Von Lithium Ionen Batterien
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Author : Schmidt, Adrian
language : de
Publisher: KIT Scientific Publishing
Release Date : 2022-09-27
Multiskalige Modellierung Von Lithium Ionen Batterien written by Schmidt, Adrian 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 2022-09-27 with Technology & Engineering categories.
In dieser Arbeit werden Modellansätze für die internen Prozesse großformatiger Lithium-Ionen-Batterien entwickelt sowie experimentell parametriert und validiert. Damit werden sowohl die elektrochemischen Verluste in den Elektroden untersucht als auch deren Wechselwirkung mit der Potential- und Temperaturverteilung großformatiger Zellen. Darüber hinaus werden zulässige Betriebsbedingungen der Zellen identifiziert sowie Potentiale hinsichtlich der Leistungs- und Energiedichtesteigerung aufgezeigt. - In this work, model approaches for the internal processes of large-format lithium-ion batteries are developed, experimentally parameterized, and validated. The electrochemical losses in the electrode’s microstructure are investigated as well as their interaction with the heterogeneous potential and temperature distribution of large-format cells. In addition, permissible operating conditions of the cells are identified as well as potentials with regard to increasing power and energy density.