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 128 for “"power densities"”.
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Improving energy and power densities of three-dimensional next generation secondary battery electrodes
3D mesostructured electrodes have been intensively investigated since the beginning of this century, based on the concept of shortening diffusion length of Li ions and electrons using either structured current collector or carbon-based additives, e.g. carbon nanotubes, reduced graphene oxides, etc. …
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Combustion systems for power-MEMS applications
… to develop a micro-scale gas turbine engine for power generation and micro-propulsion applications, this thesis presents the design, fabrication, experimental testing, and modeling of the combustion system. Two fundamentally different combustion systems are presented; an advanced homogenous …
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Gallium Nitride-Based HEMT Devices Modeling and Performance Characterization
… for microwave applications due to its high power and low noise characteristics at such frequencies. As a result of improved material growth and processing technologies, microwave power densities have been demonstrated in AlGaN/GaN HEMTs that are five to ten times greater than that of …
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Feasibility assessment and design of micro hydraulic solid-state transducers
… that are capable of exploiting the inherent power densities of piezoelectric materials. The ability of these solid-state materials to exert large forces at high frequencies engenders them with specific power levels (mass normalized) that are often several orders of magnitude greater than …
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Electrical Power Generation in Microbial Fuel Cells Using Carbon Nanostructure Enhanced Anodes
… waste streams while simultaneously generating power which can offset energy associated with the biological treatment of wastewater. During the oxidation of organic and inorganic wastes, microorganisms known as exoelectrogens have the ability to move electrons extracellularly. MiFCs generate …
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Development of three-dimensional passive components for power electronics
As component and power densities have increased, printed circuit boards (PCBs) have taken on additional functionality including heatsinking and forming constituent parts of electrical components. PCBs are not well suited to these tasks. A novel fabrication method is proposed to develop an enhanced …
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Modal analysis of laser vibrated structures
… As found by other authors, single high-power laser pulses ablate the irradiated surface material and may impulsively excite structural vibration; however, the use of laser power densities above the ablation threshold causes significant surface damage. This work extends current optical …
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A high resolution programmable thermal test chip
As silicon technology continues to scale, power densities in integrated circuits are rising, driving the need for more accurate and fine-grained thermal characterization methods. While numerical simulation remains a powerful tool for predicting on-chip temperature distributions, its accuracy …
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Investigation On the Surface Morphology Of Metal Anodes In Zinc Air Batteries With Non-Aqueous Aprotic Deep Eutectic Solvent Electrolytes
… for flexible energy storage systems with large power densities are required. While traditional Lithium ion battery systems cannot support these flexible devices, the Zinc-air system with its high energy and power density, is a very promising alternative. However, its widespread application is …
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A Variable-Structure Variable-Order Simulation Paradigm for Power Electronic Circuits
Solid-state power converters are used in a rapidly growing number of applications including variable-speed motor drives for hybrid electric vehicles and industrial applications, battery energy storage systems, and for interfacing renewable energy sources and controlling power flow in electric power …
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Microstructure and mechanical properties of laser shocked iron-based alloys
… ps pulse length and up to 200 J energy) with power densities above 10$\sp{11}$ W/cm$\sp2$. Shock waves were generated by volume expansion of the plasma formed when the material was laser irradiated. Maximum shock wave intensities were obtained using an energy-absorbing black paint coating …
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Design of a microfluidic device for the analysis of biofilm behavior in a microbial fuel cell
… as low as Ra = 100nm for a 55 [mu]m deep cut. Power densities as high as 0.4mW · m⁻², (28mV at open circuit) in the first ever polarization curve for a laminar-flow microbial fuel cell. A model was developed for biofilm behavior incorporating shear and pore pressure as mechanisms for biofilm …
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Design, Modeling and Characterization of a Multiscale Heat Exchanger for High-Temperature, High-Pressure Applications
… in many industrial processes, such as steam power plants, refrigeration, chemical plants, nuclear plants, refineries, and next-generation renewable energy storage processes. Recent advancements in power generation techniques and heat engine cycle structures offer potential improvements to the …
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Semi-solid redox flow battery
… offers significant increases in energy and power density (200 Wh/kg compared to 25-35 Wh/kg for current commercial vanadium redox batteries). The implementation of a redox flow system allows for energy to be stored outside the cell and for the power and energy of the battery to be decoupled. …
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Treatment of azo dyes in industrial wastewater using microbial fuel cells
… bioelectricity generation in two-chamber MFCs. Power densities up-to 37 mWm-2 were observed in the two-chamber MFC system during AO-7 decolourisation. Co-metabolic reductive degradation of azo dye mixtures using dye acclimated mixed microbial populations under industrially relevant conditions …
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Enabling HF power conversion : magnetic components and a wide voltage range converter
High frequency switching in power converters offers the benefits of high power density and faster transient response; however, high frequency losses have limited efforts to increase frequency into the HF (3-30 MHz) regime. This thesis addresses two of the dominant frequency-dependent loss …
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Development of solar thermophotovoltaic systems = Desarrollo de sistemas termofotovoltaicos solares
… efficiency is achieved for negligible electric power densities and under severe restrictive conditions. Chapter 3 presents a more complete multivariable model, based on the detailed balance theory, which contemplates (among other things) possible optical losses. The model shows that efficiencies …
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Doped LiFePO₄ cathodes for high power density lithium ion batteries
… with this doped cathode material may produce power densities high enough for consideration as a future battery system for hybrid electric vehicles and other high rate applications.
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Improving particle confinement in inertial electrostatic fusion for spacecraft power and propulsion
… and reduced radioactivity compared with fission power. Unfortunately, the most promising means of generating fusion power on the ground (Tokamak based reactors like ITER and inertial confinement reactors like NIF) require very large and heavy structures for power supplies and magnets, in the case …
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Characterization of Thermophotovoltaics and Materials for High-Temperature Thermal Energy Storage
… the potential to boost TPV efficiency as well as power density, which lowers costs. However, the operation and characterization of devices under >2000 °C light sources and at view factors required to achieve high power densities presents many challenges. In this thesis, we characterize …
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