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 252 for “"High power density"”.
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Development of a high power density rotor
High specific power electric machines are crucial to enabling electric and hybrid-electric aircraft. In order to meet this need, a high specific power electric machine with an unconventional topology is being developed. The topology creates mechanical challenges including expansion due to high speed, …
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Microjet impingement cooling of high power-density electronics
The increasing power density of advanced electronics, and in particular Gallium Nitride (GaN) high electron mobility transistors (HEMTs) in RF power amplifiers, represents a major challenge in thermal management. Reducing the operating temperature, by means of effective cooling, improves both the …
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Piezoelectric Transformer Integration Possibility in High Power Density Applications
… by invoking the ratio of the throughput power to volume represented by the term: power density. The fundamentals of the PT are introduced in chapter two. In chapter three, the fundamental limitations of the PT's capability of transferring power to the load are studied. There are three …
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Design of annular fuel for high power density BWRs
Enabling high power density in the core of Boiling Water Reactors (BWRs) is economically profitable for existing or new reactors. In this work, we examine the potential for increasing the power density in BWR plants by switching from the current solid fuel to annular fuel cooled both on its inside …
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Mechanical design of high frequency, high power density electric machine
… industry due to the advance of battery and power converter technologies. However, large-scale commercial aircraft electrification is hindered by the technology gap of electric machines. This thesis presented a high frequency, high power density (> 13 kW/kg), MW level electric motor design …
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Modeling and fabrication of high power density microscale thermophotovoltaic devices
… following 2-3 decades lacked in efficiency and power density. Later on, the development of III-V materials with low bandgaps promised higher efficiency and power density, and renewed the research interest in TPV. More ideas emerged recently, including the use of two surfaces separated by …
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An evolutionary fuel assembly design for high power density BWRs
… design was studied as a means to increase the power density of current and future BWR cores. The new assembly concept is based on replacing four traditional assemblies and large water gap regions with a single large assembly. The traditional BWR cylindrical UO2-fuelled Zr-clad fuel pin design …
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Doped LiFePO₄ cathodes for high power density lithium ion batteries
… in lithium ion batteries. It has an energy density similar to that of LiCoO 2, the current industry standard for cathode materials in lithium ion batteries, but with a lower raw materials cost and an increased level of safety. An inherent limitation of LiFePO4 acknowledged by researchers …
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The design of high power density annular fuel for LWRs
… fuel. Such fuel may be operated at 30-50% higher core power density than the current operating LWRs, and to a burnup of 80-100MWd/kgU. The models are used to optimize the fuel design so that it is able to achieve high power density and high burnup, and to identify the features of this fuel …
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Innovative fuel designs for high power density pressurized water reactor
… the cost of nuclear energy is to increase the power density of the reactor core. Features of fuel design that enhance the potential for high power density are derived based on characteristics of the pressurized water reactor (PWR) and its related design limits. Those features include: large …
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Packaging of a High Power Density Point of Load Converter
Due to the power requirements for today's microprocessors, point of load converter packaging is becoming an important issue. Traditional thermal management techniques involved in removing heat from a printed circuit board are being tested as today's technologies require small footprint and volume …
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Analysis and design of high power density resonant switched-capacitor converters
This thesis is motivated by the desire for power electronics designers to create power electronic converters that have high energy density (are very small) and high efficiency (few losses). Switched-capacitor (SC) topologies that utilize the high energy density of capacitors are a candidate for …
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Assessment of helical-cruciform fuel rods for high power density LWRs
In order to significantly increase the power density of Light Water Reactors (LWRs), the helical-cruciform (HC) fuel rod assembly has been proposed as an alternative to traditional fuel geometry. The HC assembly is a self-supporting nuclear fuel configuration consisting of 4-finned, axially-twisted …
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High Frequency, High Power Density GaN-Based 3D Integrated POL Modules
… they occupy a considerable foot-print. As the power demands increase for POL converters and the limited real estate of the mother board, the POL converters must be made significantly smaller than what they have demonstrated to date. To achieve these goals, two things have to happen …
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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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Electrical Integration of SiC Power Devices for High-Power-Density Applications
… applications has led to the fast development of high-power-density power electronics converters. High-switching-frequency and high-temperature operations are the two key factors towards this target. Both requirements, however, are challenging the fundamental limit of silicon (Si) based devices. …
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Design and Optimization of a High Power Density Silicon Carbide Traction Inverter
… silicon carbide based 150-kW 25 kW/L DC-AC power conversion unit capable of operation with coolant temperatures up to 90°C. The project goals were met and exceeded by first analyzing the established inverter topologies to find which one would yield the highest power density while still …
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"Development of high-frequency ""airgap"" windings for high-power density electrical machines"
This Thesis was approved for publication on 2016-04-07 at 16:22.
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Printable zirconia membranes for high power density micro solid oxide fuel cells
… technology because of their ability to achieve high energy efficiency and low emissions. Among the various types of fuel cells, solid oxide fuel cells (SOFCs) have emerged as one of the most promising types, because of their fuel flexibility and there efficiency. The problem with SOFCs, however …
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High Frequency, High Power Density Integrated Point of Load and Bus Converters
The increased power consumption and power density demands of modern technologies combined with the focus on global energy savings have increased the demands on DC/DC power supplies. DC/DC converters are ubiquitous in everyday life, found in products ranging from small handheld electronics requiring …
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