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.
Results
Showing 1 to 20 of 77 for “"material processing"”.
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Material processing of quantum well infrared photodetectors
The material and device characterization of furnace and rapid thermally annealed (RTA) GaAs/AlGaAs multiple quantum well (MQW) infrared (IR) photodetectors (QWIPs) epitaxially grown on GaAs and Si substrates is presented. The advances in epitaxial growth allow the precise control of the dimensions, …
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Simulation of Magnetically Confined Inductively Coupled Plasma
… consistent distribution, suitable for large-area material processing. Fluid model simulations of 3D argon inductively coupled plasma (ICP) were performed in COMSOL for the proposed coil and a conventional single cylindrical coil with the same impedance to be used as reference, to compare and …
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A variational framework for multi-scale defect modeling in strained electronics and processing of composite materials
With the recent advances in material processing technologies and the introduction of the material genome initiative, material processing has gained an increased level of attention in the research community. Primary challenges in most material processing technologies and specifically in composite …
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The Role of The Plasma During Laser-Gas and Laser-Metal Interactions
… The recent advances in industrial laser material processing and modeling efforts warrant a detailed study of laser-plasma-target interactions.
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Annealing Techniques for Color Center Formation
… annealing. In this thesis, we develop advanced material processing methods and characterization techniques to address critical challenges in the formation of high-performance diamond color centers to advance towards the efficient creation of desired dopant-vacancy centers with minimal formation …
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Characterization of silicon photovoltaic wafers using polarized infrared imaging
Photovoltaic (PV) solar industry uses low-cost material processing methods to produce silicon wafer-based solar cells. Thermal process can introduce crystal defects and residual stress in a PV wafer, which can impact the electrical performance and mechanical reliability of a finished solar cell. …
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Design tools for linear viscoelastic fluids
… design often makes use of conventional materials such as hard, elastic solids and simple, Newtonian fluids. Rheologically-complex materials (non-Newtonian fluids and soft solids) demonstrate useful and novel properties in both engineered and biological systems. Incorporating these …
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Aqueous reactivity of glassy industrial byproducts in alternative cementitious systems
… cement (OPC). CO₂ emissions inherent to source-material processing (i.e., firing of limestone at 1450 °C) and annual OPC production volumes of 4.1 billion metric tons cause an estimated 5-11% of global annual greenhouse gas (GHG) emissions. Material substitution with lower-footprint resources is …
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Investigations of three-dimensional optical transfer functions
The performance of two-dimensional image processing systems has been well documented. In this thesis we study the performance of three-dimensional imaging systems. Such a study helps in understanding the fundamental restrictions of the propagation of three-dimensional (3-D) wavefields. The …
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An evaluation of skills development in a sample of metal and engineering firms in Gauteng
… metals beneficiation value chain, namely: raw material processing firms; intermediate product producing firms and finished product producing firms.
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Sustainable materials from renewable protein feedstock and waste rubber
This thesis focuses on developing sustainable materials from underutilized feedstock, namely proteins and waste rubber from used car tires. Valorization of proteins for use in engineering plastics can reduce reliance on fossil fuels for materials manufacturing, as well as increase economic …
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Investigating the Behavior of Boron Nitride Nanomaterials in Aqueous Surfactant Solutions
Boron nitride nanomaterials are an exciting and understudied class of materials with enticing properties for a wide range of applications. They’re extremely lightweight and strong, with high thermal and chemical stability, and a wide bandgap that makes them electrically insulating and transparent …
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Utilizing bioinspired metal-coordinate bonding in the solidification of soft gels via crosslinking, dehydration and mineralization
… and compliant state and go through a series of material solidification processes to serve a multitude of complex functions at various life stages. Many of these material transitions occur via an organic-inorganic processing pathway that involves a genetically programmed hierarchy of …
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Developing a Multi-axis Femtosecond Laser Micromachining Platform for Laser Induced Refractive Index Modification: Fiber Bragg Gratings, Waveguides, and Beyond
… flexibility for high precision laser material processing.
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Mechanical design for advancing small-scale solid state additive manufacturing to enable deposition of commercial metal alloys
… creates or repairs parts without melting the material. This research focuses on developing a small-scale version of AFSD, including new machine designs and tools for handling miniaturized materials. The study demonstrates successful deposition of high-strength alloys, like marten-sitic steel …
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Deposition of electronic and plasmonic materials inside microstructured optical fibres
… capabilities of optical fibres and the signal processing properties of semiconductors devices. Only recently, with the advent of microstructured optical fibres and templating material processing methods, it has been possible to create optical fibres with solid-state material inclusions. An …
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Power scaling and nonlinear conversion in fiber-based sources at novel wavelengths
… applications in imaging, communication, and material processing. This dissertation focuses on different ways to increase the power of fiber-based laser systems at novel wavelengths outside the typical gain emission spectrum of rare-earth gain dopants. The first part of this thesis focuses on …
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Application of HTML/VRML to Manufacturing Systems Engineering
… products, information systems and data, material processing, handling, and storage systems. Because of this complexity, systems must be modeled using a variety of views and modeling formalisms. In order to design and analyze manufacturing systems, the multiple views and models often need …
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Surface Modification of Multimaterial Multifunctional Fibers Enabling Biosensing Applications
… different phenomena using light. Furthermore, material processing technologies and micro fabrication methods have exponentially advanced, allowing engineers and scientists to develop new and more complex sensors on optical fibers platforms; specifically attractive for life science and …
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Experimental Verification for Microwave Processing of Materials in a Single Mode Rectangular Resonant Cavity
The benefits of applying microwave energy to material processing techniques have been well documented and studied. The potential benefits over conventional oven heating include faster processing times, more uniform heating, more consistent product quality, and the possibility of precise control. …
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