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Articles 1 - 6 of 6
Full-Text Articles in Engineering
Atomic-Level Mechanisms Of Fast Relaxation In Metallic Glasses, Leo W. Zella
Atomic-Level Mechanisms Of Fast Relaxation In Metallic Glasses, Leo W. Zella
Doctoral Dissertations
Glasses are ubiquitous in daily life and have unique properties which are a consequence of the underlying disordered structure. By understanding the fundamental processes that govern these properties, we can modify glasses for desired applications. Key to understanding the structure-dynamics relationship in glasses is the variety of relaxation processes that exist below the glass transition temperature. Though these relaxations are well characterized with macroscopic experimental techniques, the microscopic nature of these relaxations is difficult to elucidate with experimental tools due to the requirements of timescale and spatial resolution. There remain many questions regarding the microscopic nature of relaxation in glass …
3d Experimental Studies Of Temperature And Crystallographic Effects On Creep And Strength In Rock Salt, Amirsalar Moslehy
3d Experimental Studies Of Temperature And Crystallographic Effects On Creep And Strength In Rock Salt, Amirsalar Moslehy
Doctoral Dissertations
Salt domes utilization as storage reservoirs in the energy sector has led to extensive studies on rock salt’s mechanical and geothermal behavior. These important facilities’ safety and serviceability rely on understanding rock salt’s compressive strength and creep behavior under various loading directions, water contents, in-situ stresses, and temperatures. Despite numerous studies on rock salt’s mechanical behavior in the literature, there are still many unanswered questions about rock salt’s behavior. This dissertation was aimed at utilizing state-of-the-art experimental techniques such as 3D synchrotron micro-computed tomography (SMT) and 3D x-ray diffraction (3DXRD) along with hundreds of compression and creep experiments to enhance …
Additive Manufacturing Of Magnetic Materials For Electric Motor And Generator Applications, Haobo Wang
Additive Manufacturing Of Magnetic Materials For Electric Motor And Generator Applications, Haobo Wang
Doctoral Dissertations
This work details the research into the 3D Printing, also known as Additive Manufacturing (AM), of both impermanent and permanent magnets. This work also details the research in enabling such AM magnets in electrical machine applications, primarily motors and generators. The AM processes of many types of magnets are described in detail. The material properties of such AM magnets are also described. The two main types of AM magnets that are discussed in detail are AM NdFeB, and AM Silicon Steel. The implementation of AM NdFeB as rotor magnets, and the implementation of AM Silicon Steel as rotor and stator …
The Synthesis And Optimization Of Sulfide And Halide Solid Electrolytes For All Solid-State Batteries, Teerth Brahmbhatt
The Synthesis And Optimization Of Sulfide And Halide Solid Electrolytes For All Solid-State Batteries, Teerth Brahmbhatt
Doctoral Dissertations
Countries and organizations around the world have established ambitious targets to transition away from fossil fuel-based energy sources and devices. The transition is focused on cleaning up power generation by converting coal, natural gas, and oil-based power generation to renewables and nuclear energy. Decarbonizing other sectors of energy use, transportation for example, will require broader electrification. To drive this move away from fossil fuel powered transportation will require portable energy storage devices. Conventional lithium-ion batteries are a popular candidate to lead this shift. However, these batteries often rely on flammable liquid electrolytes and carbon anodes that suffer from low energy …
Non-Collinear Magnetic Textures Studied By Neutron Scattering, Nan Tang
Non-Collinear Magnetic Textures Studied By Neutron Scattering, Nan Tang
Doctoral Dissertations
Non-collinear magnetic structures, where the magnetic moments do not align along a single axis, can lead to interesting physical phenomena and potential device applications. In this dissertation, two specific non-collinear magnetic textures are studied which includes soft/hard bilayer and skyrmions. Soft/hard magnetic bilayer thin films have been widely used in data storage technologies and permanent magnet applications. Here, we use polarized neutron reflectometry (PNR) to study magnetic configuration in soft-hard bilayer heterostructure thin films designed with different sample geometry and material properties under a range of temperatures and fields. Comparing the PNR results to the micromagnetic simulations reveals that the …
Development And Characterization Of Stable Low-Cost Salt Hydrate-Based Phase Change Materials For Thermal Energy Storage Applications, Damilola Olayinka Akamo
Development And Characterization Of Stable Low-Cost Salt Hydrate-Based Phase Change Materials For Thermal Energy Storage Applications, Damilola Olayinka Akamo
Doctoral Dissertations
Energy storage technologies are gaining attention due to rising utilization of renewable energy sources. One of the viable energy storage technologies is thermal energy storage (TES) in which system stores and releases thermal energy for various uses. Applications for TES systems include building systems, space heating and cooling, and refrigeration. Several TES systems use phase change materials (PCMs) to operate near-isothermally owing to phase change latent heat. Inorganic salt hydrate PCMs are popular because to their inexpensive cost, high energy density, and near ambient phase transition temperature. However, salt hydrate PCMs have phase separation, low thermal conductivity, and supercooling issues …