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 64 for “"Materials Characterization"”.
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Unidirectional Magnetoresistive Behaviors: Materials, Characterization, and Prospects
Spin-orbit torque (SOT) materials and devices have become one of the most promising candidates for future memory and computing systems due to their high endurance, high speed, high storage density, and low energy consumption. However, using the three-terminal magnetic tunnel junction structure for …
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Solar thermoelectric power conversion : materials characterization to device demonstration
… to measure the properties of thermoelectric materials including the Seebeck coefficient, the electrical resistivity and the thermal conductivity are prone to large errors. Therefore, we introduce in this thesis novel experimental techniques to measure all relevant properties with improved …
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Materials characterization and structural design of ceramic micro turbomachinery
… includes the effect of length scale on materials and structural response, material characterization, structural analysis and failure probability, and heat transfer analysis. Due to the differences in length scales between the microengine and conventional macroscale turbomachinery, a …
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Materials Characterization and Spectroscopy for a Methane Abatement Catalyst
… potential performance at 400 and 950 C. Using materials characterization and spectroscopy techniques including scanning-electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Brunauer-Emmett-Teller analysis (BET), differential scanning calorimetry (DSC), and X-ray diffraction …
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MATERIALS CHARACTERIZATION FOR SUB-MICRON SUPERCONDUCTING INTERCONNECTS IN RECIPROCAL QUANTUM LOGIC CIRCUITS
… dissertation presents work on three aspects of materials characterization of RQL interconnects: implementing a method to deconvolve superconducting and dielectric losses, evaluating losses in three generations of RQL fabrication, and understanding the microscopic physics that determines the …
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Materials characterization and transmission analysis in erbium-doped gallium nitride microresonator structures
GaN:Er is an attractive material for room temperature 1.54 pm luminescence enhancement devices for use in telecommunications because it does not experience thermal quenching at room temperature like Si:Er and can be electronically pumped. GaN:Er layers grown by molecular beam epitaxy (MBE) on …
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Cryogenic Shape Memory Alloy Actuators For Spaceport Technologies: Materials Characterization And Prototype Testing
… its thermomechanical processing, subsequent characterization using dilatometry and differential scanning calorimetry and implementation in the conduction switch configuration are addressed. This work was funded by grants from NASA KSC (NAG10-323) and NASA GRC (NAG3-2751).
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Development of a Low-Cost PCB-Based High-Frequency AC Susceptometer for Magnetic Materials Characterization
… susceptometer designed to characterize magnetic materials up to 200 MHz. Leveraging a low-cost printed circuit board (PCB) design and commercially available high-frequency electronics, femtoMag addresses limitations in conventional susceptometry by enabling measurements of magnetic powders and …
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Non-invasive microwave and millimeter wave reflectometry and imaging for human skin diagnosis and materials characterization
"Microwave and millimeter wave reflectometry and synthetic aperture radar (SAR) imaging techniques have been successfully applied in many applications, such as nondestructive testing and evaluation (NDT&E), security inspection and medical diagnosis. In this dissertation, the feasibility of using …
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Materials characterization of reduced iron oxide samples and atmospheric H2 plasma assisted reduction at low temperatures
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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In-situ Scanning Electron Microscopy for Electron-beam Lithography and In-situ One Dimensional Nano Materials Characterization
… (EBL) and in-situ one dimensional nano materials electrical characterization. A precise voltage contrast image positioning for in-situ EBL to integrate nanowires into suspended structures for nanoswitch fabrication has been developed. The in-situ EBL eliminates the stage movement error …
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Liquid dynamic compaction spray deposition of commercial and modified 3003 Al-alloy : process application and materials characterization
… Institute of Technology, Dept. of Materials Science and Engineering, 1996.
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Frequency and Field Strength Materials Characterization with Complementary Split-ring Resonators, Coplanar Waveguides, and the Virtual Ground Method
… complex permittivity and permeability of materials that undergo metal–insulator transitions is a significant challenge which is important for defense and commercial applications. This thesis attempts to articulate barriers in the prior art, and how the techniques described herein overcome …
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Acoustooptical techniques for ultrasonic materials evaluation: optical fiber interferometry and pulse-echo systems
… of two acoustooptical systems for ultrasonic materials characterization has been investigated. The first system uses an optical fiber interferometric technique to detect directly slowly varying residual stresses and both high frequency continuous and transient ultrasonic waves characteristic …
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Advanced Characterization of Materials for Superconducting Radiofrequency Accelerator Cavities
… radio-frequency (SRF) acceleration. From a materials perspective this means reducing residual surface resistance or raising the operating temperature (currently ~2 K) of SRF cavities. Both are pursued by materials modification: nitrogen doping/infusion in the first instance and coating with …
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An intelligent workstation for reliable residual stress determination using x-ray diffraction
… as well as to enhance the understanding of such materials characterization data. The hurdle to date is the variety of skills necessary in a wide range of scientific and engineering disciplines and which are not commonly found in a single individual. We suggest that a computer-based system, …
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Reactive Sputter Deposition of Lithium Phosphorus Oxynitride Thin Films, A Li Battery Solid State Electrolyte
… the methodologies of sputter deposition and materials characterization of the LiPON thin film electrolytes. The LiPON thin films were deposited under varying conditions of process gas, substrate bias, and deposition temperature. To understand the variations in ionic conductivity observed, the …
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Single Crystal Sapphire Photonic Crystal Fibers
… the fiber. The fibers were also examined using materials characterization equipment to see how the harsh environments impacted the optical and mechanical stability of the bundled fiber.
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Dynamical effects in crystalline solid state systems: theory of temperature dependent optical response of bulk gaAs and vibrational modification of C(111) 2 x 1 Surface in Comparison to Experiment
… of the dynamical processes in a range of materials. This establishes technologically important correlation with experimentally measured macroscopic properties and materials characterization. This method—the first of its kind—is a natural and long overdue extension of customary …
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Evaluation and modeling of repeated load test data of asphalt concrete for mechanistic-empirical flexible pavement design
… <p>In addition, a conceptual framework for materials characterization of routinely used HMA mixtures was developed. The conceptual framework will aid state highway agencies in developing a mixture catalog that will help streamline the mix design process, it will also provide guidance in …
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