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 219 for “"High 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 …
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Optimization of Polymer-based Nanocomposites for High Energy Density Applications
… demand 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 …
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Development of high energy density dielectrics for pulse power applications
… (> 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 (DC or pulsed) can also influence the BDS. …
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Breakdown in high voltage, high energy density multilayer ceramic capacitors
… of breakdown, both 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 …
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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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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
… in many astrophysical environments, in which high Mach number flows interact with ambient media, planetary obstacles, and/or spacecraft to generate strongly radiating shocks. Some examples include extrastellar jets from radio galaxies, relativistic jets from quasars and blazars, Herbig-Haro …
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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
… is focused 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 …
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Characterization of mono-energetic charged-particle radiography for high energy density physics experiments
… alphas, has recently been used to image various High-Energy-Density Physics objects of interest, including Inertial Confinement Fusion capsules during their implosions, Laser-Plasma Interactions, and Rayleigh-Taylorinstability growth. An imploded D23He-filled glass capsule - the backlighter - …
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Volumetric creation of ultra-high-energy-density plasma by irradiation of ordered nanowire arrays
Creating appreciable volumes of Ultra-High-Energy Density (UHED) matter in the laboratory is a challenge. Recent developments in the fabrication of vertically aligned nanowire array targets, in coordination with ultra-high-contrast femtosecond laser pulses focused to relativistic intensity, have …
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Synthesis and characterization of mechanically alloyed aluminum-based compounds as high energy density materials
… metastable reactive powders for potential use as high energy density materials in propellants, explosives, and pyrotechnics was developed. These powders are intended to replace aluminum typically added to energetic formulations to increase reaction enthalpy and temperature. The new materials are …
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Characterization of nitrogen effects in high energy density weldments of Nitronic 40 stainless steel
… though the electron beam welds exhibited a higher strength than the laser welds. Standard predictive equations were found to under-predict the strength of the laser welds, even when average grain size or intercept distances were measured. The contribution of nitrogen solid solution …
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High Energy Density Layered Cathodes for Lithium Ion Batteries: New Morphologies and New Compositions
… ion batteries are widely recognised for their high energy density compared to other electrochemical energy storage systems. To be able to compete with the traditional internal combustion engines that consume fossil fuels, however, the energy density of lithium ion battery systems must be …
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High energy density entrainment-based catalytic micro-combustor for portable devices in extreme environmental conditions
The increasing demand for low-cost, high energy density heat sources has motivated the development of compact and lightweight combustion-based devices. In this work, we first optimized the catalytic bed segmentation scheme to enhance fuel management in a mesoscale parallel-plate combustor. After …
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Understanding and Exploiting Anion Redox Process for High Energy Density Positive Electrode Materials for Li-ion Batteries
… vehicles calls for a better solution for energy storage systems. Li-ion battery system give rise to such opportunity by providing reasonable cycle life and energy density. It was widely assumed that Li-ion battery positive electrode materials, Li transition metal oxides, store charges …
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