Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 98 for “"Temperature applications"”.
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Photonic crystals for high temperature applications
… of metallic photonic crystals (MPhCs) for high temperature applications, for instance thermophotovoltaic (TPV) energy conversion and selective solar absorption. We begin with the exploration of refractory two-dimensional (2D) MPhC slabs as selective thermal emitters that approach the emittance …
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GaN Electronics for High-Temperature Applications
… which have given rise to high-performance (room temperature) transistors for RF, power, MEMS, and mixed-signal applications. Previous works on high-temperature (HT) electronics have been typically limited to two aspects, namely, the high-temperature robustness of discrete transistors and basic …
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GaN electronics for high-temperature applications
Gallium nitride is a promising candidate for high-temperature applications. However, despite the excellent performance shown by early high-temperature prototypes, several issues in traditional lateral AlGaN/GaN HEMTs could cause early degradation and failure under high-temperature operation (over …
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Nanoelectronic and nanomechanical devices for low temperature applications
Cooling physical experiments to low temperatures removes thermal excitations to reveal quantum mechanical phenomena. The progression of nanotechnologies provides new and exciting research opportunities to probe nature at ever smaller length scales. The coupling of nanotechnologies and low …
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Development of High Entropy Alloys for High Temperature Applications
High Entropy Alloys, Spark Plasma Sintering, Ball milling, AlCoCrFeNI HEA, CO- Free HEA, Oxidation, Corrosion
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Design and Fabrication of Microreactors for High Temperature Applications
Microreactors show promise because of the phenomenon of higher heat and mass transfer rates as the length scale decreases. This thesis describes the fabrication and characterization of SiC and SiCN inverted beaded catalyst supports, which have high chemical and thermal stability (are stable to …
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Sapphire Fiber Based Sensing Technologies for High Temperature Applications
… fiber based sensing technology for sensing applications in temperature beyond 1000°C. Several sensing schemes have been proposed and studied to date including sapphire fiber extrinsic and intrinsic Fabry-Perot interferometers, fiber Bragg gratings and long period gratings inscribed in …
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An Investigation of Geopolymers for Use In High Temperature Applications
… the use of various geopolymer concretes at high temperatures. Geopolymer cement concretes (GCCs) do not require hydration to maintain a stable structure. This is beneficial in high temperature conditions, such as a core meltdown at a nuclear power plant or a structural fire, where dehydration of …
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A Silicon Carbide Power Management Solution for High Temperature Applications
… power devices capable of operating in high temperature and high voltage applications has spurred on the research of semiconductor materials with the potential of breaking through the limitations of traditional silicon. Gallium nitride (GaN) and silicon carbide (SiC), both of which are wide …
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Langasite bulk acoustic wave resonant sensor for high temperature applications
… conductivities and mass change as functions of temperature, dopant level and pO₂. Given that the magnitudes of conductivity and mass change directly affect the resolution and sensitivity limits of langasite resonators, their predictions allowed for the definition of acceptable operating limits …
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Thermal and Optical Properties of Oxide Coatings for High-Temperature Applications
Oxide coatings are used in several high-temperature applications to provide thermal insulation on account of their low thermal conductivity. However, many of them that are currently used, such as zirconia, mono- and disilicates, and zirconates, are translucent to thermal radiation up to 3 – 6 …
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Manufacturing of advanced continuous fiber reinforced composites for high temperature applications
… as attractive alternatives in structural applications that require material to be stronger, lighter and/or more resilient to environmental effects. The current work is on the development of processes to produce continuous fiber reinforced materials from two state of the art resin systems. …
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Memory Module Design for High-Temperature Applications in SiC CMOS Technology
… make this material a viable choice for high-temperature electronics systems. Leveraging the high-temperature capability of SiC is crucial to automotive, space exploration, aerospace, deep well drilling, and gas turbines. A significant issue with the high-temperature operation is the …
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Modeling of gallium nitride transistors for high power and high temperature applications
… for high power, high frequency, and high temperature applications. In order to utilize the full potential of GaN-based power transistors, proper device modeling is essential to verify its operation and improve the design efficiency. In this view, this research work presents modeling and …
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Improving Oxidation Resistance in Polycrystalline Ni-based Superalloys for High-Temperature Applications
… oxidation resistance can enable higher operating temperatures in aeroengines with increased fuel efficiencies and minimised CO₂ emissions. This thesis investigated the oxidation behaviour in polycrystalline Ni-based superalloys with a combination of experimental and computational methods. The …
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Durability of Polyimide Adhesives and Their Bonded Joints for High Temperature Applications
The objective of this study was to evaluate and develop an understanding of durability of an adhesive bonded system, for application in a future high speed civil transport (HSCT) aircraft structure. The system under study was comprised of Ti-6Al-4V metal adherends and a thermosetting polyimide …
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TRANSITION METAL COATINGS FOR ENERGY CONVERSION AND STORAGE; ELECTROCHEMICAL AND HIGH TEMPERATURE APPLICATIONS
… to dilute the pure O2 feed and reduce the flame temperature. Refractory metal diffusion coatings of Ti and Zr atop P91 steel were created and tested for their ability to prevent corrosion in an oxidizing atmosphere at elevated temperature. Using pack cementation, diffusion coatings of thickness …
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Synthesis and characterization of thermally stable palladium-based composite membranes for high temperature applications
… the rate of increase of the nitrogen leak in the temperature range of 500-600 ºC was determined. The results showed that doping Pd with Pt or Ru significantly reduces the leak growth rate compared to a pure Pd membrane by almost one order of magnitude. The addition of Ru to Pd was sufficient to …
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Comparison of refrigerants R410a and R404a for use in low temperature applications: A computer model study
… and environmentally friendly refrigerants in low temperature applications. This study provides a perspective for comparison of refrigerant R410a with R404a. As R410a is now widely used commercially, further knowledge is desired on how different an R410a system is from established refrigerant …
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Nickel-based designed materials manufactured via laser-based powder bed fusion of metals for high-temperature applications
… are probably going to have higher hot gas temperatures in both scenarios. As a result, hot gas components must become more temperature resistant, for example by using high-temperature alloys or cutting-edge cooling techniques. Using open-porous structures made from superalloys for …
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