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 679 for “"energy density"”.
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Heteroatom-containing carbons for high energy density supercapacitor
The supercapacitor is one of the most important energy storage devices as its construction allows for addressing many of the drawbacks related to batteries, but the low energy density of current systems is a major issue. In this doctoral dissertation, with a view to attaining high energy density …
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Ceramic dielectrics for high energy density capacity application
… of titanium oxide (TiO₂) dielectrics for high energy density capacitor applications. The effects of aliovalent dopants on the dielectric properties of TiO₂ ceramics were investigated, aiming to further improve the desired dielectric properties especially at elevated temperatures (up to 200°C). …
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Analysis and Comparison of Three Acoustic Energy Density Probes
… sound pressure is directly related to potential energy density. Consequently, the measurement of sound pressure alone does not inherently provide insight into the total energy density of the sound field. Specifically, no information about the kinetic energy density of the sound field is available …
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Energy density correlations in the three-dimensional Ising model
The energy-density-energy-density correlation function is studied in the three-dimensional Ising model in zero external field, for various spins on the fcc lattice. An extension of the linked-cluster technique is used to obtain high-temperature series expansions for the correlation function and its …
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Energy density method and its applications to defect energies
… a method to study various defects using an energy density formulation in density functional theory. Unlike traditional total energy methods that find a single energy as the difference between two calculations, this approach can provide the formation energies for more than one point defect, …
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Optimization of Polymer-based Nanocomposites for High Energy Density Applications
… for flexible, lightweight and compact high energy density dielectrics. This limitation in performance is due to the trade-off between dielectric constant and dielectric breakdown. Insulating polymers are of interest owing to their high inherent electrical resistance, low dielectric loss, …
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Development of high energy density dielectrics for pulse power applications
<p>"Pulsed power applications require large dielectrics (> 10" diameter and ~0.125 thick) with high breakdown strength (BDS). The presence of porosity and increasing grain size lowers the BDS. Testing conditions such as sample thickness, electrode area, electrode design, and form of applied voltage …
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Breakdown in high voltage, high energy density multilayer ceramic capacitors
… mechanical and electrical, in high voltage, high energy density, BaTiO₃ multilayer ceramic capacitors were studied. The flexural strength of the capacitors was 96 +/- 13 MPa. Failure was due to surface defects or pores close to the surfaces of the samples. The dielectric breakdown strength of the …
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Fabrication and demonstration of high energy density lithium ion microbatteries
… have only experienced mild improvement in energy and power performance, which remains one of the main hurdles for their widespread implementation in applications outside of powering compact portable devices, such as in electric vehicles. Li-ion batteries must be advanced through a …
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Interfacial adhesion of thin film high energy density anode materials
Future energy storage needs are rapidly moving beyond the capabilities of current Li-ion battery technologies. The demand for greater energy density, performance, and longevity has led to the development of numerous three-dimensional (3D) structured anodes that can leverage the incredible Li …
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A bio-inspired approach to increase device-level energy density
… of the active materials that directly store energy. This research has resulted in active materials with higher specific capacity, increased the voltage of batteries in order to store more energy per electron, and lead to the development of electrolytes and binders compatible with …
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Active Minimization of Acoustic Energy Density in a Mock Tractor Cab
… modified for the minimization of acoustic energy density (ED), rather than the more traditional minimization of squared acoustic pressure (SP). Three loudspeakers produced control signals within a mock cabin composed of a steel frame with plywood sides and a Plexiglas® front. An energy …
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Constant-Flux Inductor with Enclosed-Winding Geometry for Improved Energy Density
… been searching for ways to improve the magnetic energy density and reduce the package size of magnetic parts. The "constant-flux" concept discussed herein is leveraged to achieve high magnetic-energy density by distributing the magnetic flux uniformly, leading to inductor geometries with a volume …
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Improvements on carbon nanotube structures in high-energy density ultracapacitor electrode design
Ultracapacitors are a class of electrochemical energy storage device that is gaining significant industrial traction due to their high charging rate and cycle life compared to rechargeable batteries; however, they store significantly less energy on a per-volume basis. The quest to find an electrode …
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Laboratory Experiments of High-Energy-Density Shocks in Magnetized Supersonic Plasma Flows
… environments using pulsed-power driven high-energy-density-plasma laboratory experiments, by generating hypersonic, magnetized large-Reynolds’ number plasma flows, using exploding z-pinch wire arrays on the MAGPIE facility (1.4 MA peak current, 250 ns rise time). Plasma flows from adjacent …
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Crosslinked polymer-based electrolytes for high- energy density Li-based batteries for EVs
L'abstract è presente nell'allegato / the abstract is in the attachment
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Modeling and simulations of diphasic composites for development of high energy density dielectrics
… on diphasic dielectric composites for high energy density storage applications in pulsed power and power distribution systems. Composite materials are particularly attractive because they can synergistically combine high permittivity with high breakdown strength of the individual phases. …
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Sound Absorption and Sound Power Measurements in Reverberation Chambers Using Energy Density Methods
… obtain suitable measurements. The total acoustic energy density provides greater spatial uniformity than squared pressure, which requires fewer source-receiver positions to produce similar or better accuracy in measurement results. This paper explores the possibility of using energy density in …
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Responsiveness of Cobb MV × 700 Broilers to Dietary Amino Acid and Energy Density
… In particular, amino acids (AA) and dietary energy have been identified as key drivers of live performance and carcass composition. In addition, increased nutrient density in broiler diets have been linked to an increase in breast muscle myopathies such as white striping and woody breast. …
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