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 34 for “"High-temperature operation."”.
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Design and Manufacture of an Ultrasonic Transducer for Long-term High Temperature Operation
… design of ultrasonic transducers suitable for high temperatures is introduced. The transducers are targeted for trouble-free continuous operation at 700-800 째C for at least two years, with sufficiently wide bandwidth to yield good temporal resolution. The design and manufacturing procedures …
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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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Circuit rating methods for high temperature cables
For the safe and efficient operation of power transmission systems, each system component must have an accurate current rating. Since the advent of formal power networks a wide variety of methods have been employed to calculate the current carrying capacity of power cables, ranging from simple …
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High Power Density and High Temperature Converter Design for Transportation Applications
The continual development of high-power-density power electronic converters is driven particularly by modern transportation applications like electrical vehicles and more electric aircraft where the space and carrier capability is limited. However, there are several challenges related to …
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Investigation of Power Semiconductor Devices for High Frequency High Density Power Converters
… specific requirements like limited space and high ambient temperature etc. This needs the power converter to achieve high power density and high temperature operation. It is usually required that the active power devices operate at higher switching frequencies to shrink the passive components …
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Advancing radiative heat transfer modeling in high-temperature liquid-salts
… communities are investigating the use of high Prandtl number liquid-salts in energy generation systems, including fluoride salt-cooled high-temperature reactors (FHRs), molten salt reactors (MSRs), fusion devices, and concentrated solar power plants. The temperature distribution in the …
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Characterization, Reliability and Packaging for 300 °C MOSFET
… (SiC) is a wide bandgap material capable of higher voltage and higher temperature operation compared to its silicon (Si) counterparts due to its higher critical electric field (E-field) and higher thermal conductivity. Using SiC, MOSFETs with a theoretical high temperature operation and …
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A MEMS thermoelectric generator
… of the thermoelectric effects and the operation of thermoelectric generators. A new analysis of the efficiency of thermoelectric devices, including parasitic losses, is included, with a detailed derivation in an appendix. The design of a prototype MEMS thermoelectric generator is …
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Fiber-Optics Based Pressure and Temperature Sensors for Harsh Environments
Monitoring accurate temperature and pressure profiles in harsh environments is currently in high demand in aerospace gas turbine engines and nuclear reactor simulators. Having the ability to measure both quantities continuously over a region, without thermal coupling, using a sensor with a small …
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Design of a High Temperature GaN-Based Variable Gain Amplifier for Downhole Communications
… to explore deeper wells, where the ambient temperature often exceeds 210 °C. The need for high temperature operation, combined with the need for real-time data logging has created a growing demand for robust, high temperature RF electronics. This thesis presents the design of an intermediate …
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Characterization and Modeling of 4H-SiC Low Voltage MOSFETs and Power MOSFETs
<p>The integration of low voltage and high voltage circuits on SiC has profound applications. SiC power devices have proved their superiority in terms of high temperature operation, faster switching frequencies and larger power densities when compared with Si power devices. The control of SiC power …
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Modelling of semiconductor nanostructures : electronic properties and simulated optical spectra
… μm) wavelength ranges, with great potential for high performance and high temperature operation. As well as simple designs, complex structures incorporating low dimensional components (e.g. quantum wells and quantum dots) are not unusual. Often, the optical and electronic characteristics of these …
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The Development and Packaging of a High-Density, Three-Phase, Silicon Carbide (SiC) Motor Drive
… field are resulting in systems characterized by higher operating efficiencies, reduced footprint, minimal form factor, and decreasing mass. In particular, these attributes and characteristics are being inserted into numerous consumer applications, such as light-emitting diode lighting, compact …
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Electrochemical H insertion in Pd thin films
… between aqueous and solid electrolytes, temperature, and thin film vs. bulk Pd revealed that thinner films, lower temperatures, and aqueous electrolytes tended to promote higher achievable H content, with the highest H:Pd ratio observed being 0.96 ± 0.02. These results not only show high …
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Novel Conceptual Design And Anlysis Of Polymer Derived Ceramic Mems Sensors For Gas Turbine Environment
… for developing micro sensors for Ultra High Temperature and turbine applications lie in that the sensors have to survive extremely harsh working conditions that exist when converting fuel to energy. These conditions include high temperatures (500-1500°C), elevated pressures (200-400 …
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Structural and Opto-Electronic Properties of GaAs and InP Based Quantum Dot Lasers
… dot (QD) lasers is reported. <br/> <br/>A high resolution structural analysis allows a size anisotropy of commercial GaAs based QDs to be determined. A model to simulate the shape of the density of states is then developed which accurately reproduces low temperature PL and room temperature …
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p-GaN Platform for Next-Generation GaN Complementary Transistors and Circuits
… they offer compactness, reduced parasitics, and higher performance compared to discrete transistors or printed circuit board (PCB) integration. The p-GaN platform exhibits tremendous potential in power ICs and recently, in high temperature (500 °C) digital circuits. While the initial …
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Evaluation of ceramic candle filters degradation and damage location using four-point bending tests
… from strength degradation due to persistent high temperature operation, thermal transient events, excessive ash accumulation and bridging, and pulse cleaning. This study proposes a nondestructive evaluation of the structural properties of these ceramic filters. The ceramic candle filter is a …
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Design and Development of High Density High Temperature Power Module with Cooling System
… that pushes the limitations of junction temperature, power rating, and switching frequency of Si devices. These advanced properties will lead converters to higher power density. However, the reliability of the SiC semiconductor is still under investigation, and at the same time, the …
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Mid-IR type-II InAs/GaSb nanoscale superlattice sensors
… decreasing their performance and ability for high temperature operation, including fast Auger recombination rates and high thermal generation rate. These detectors operate at low temperatures (77K-200K) in order to obtain high signal to noise ratio. The requirement of cooling limits the …
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