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Articles 1 - 4 of 4
Full-Text Articles in Engineering
Fourier Transform Infrared Spectroscopy For The Measurement Of Gesn/(Si)Gesn, Solomon Opeyemi Ojo
Fourier Transform Infrared Spectroscopy For The Measurement Of Gesn/(Si)Gesn, Solomon Opeyemi Ojo
Graduate Theses and Dissertations
Photoluminescence (PL) and Electroluminescence (EL) characterization techniques are important tools for studying the optical and electrical properties of (Si)GeSn. Light emission from these PL and EL measurements provides relevant information on material quality, bandgap energy, current density, and device efficiency. Prior to this work, the in-house PL set-up of this lab which involves the use of a commercially-obtained dispersive spectrometer was used for characterizing both GeSn thin film and fabricated devices, but these measurements were limited by issues bordering on low spectral resolution, spectral artifacts, and poor signal-to-noise ratio (SNR) thereby resulting in the possible loss of vital information and …
Design And Integrity Testing Of Sapphire Optical Windows In A Cryogenic Pressure System, Matthew David Williamson
Design And Integrity Testing Of Sapphire Optical Windows In A Cryogenic Pressure System, Matthew David Williamson
Masters Theses
The performance of cryogenic liquid hydrogen neutron moderators at the Spallation Neutron Source (SNS) is significantly impacted by the ratio of orthohydrogen and parahydrogen present in the moderator vessels. High parahydrogen (>99%) content is desirable for peak brightness and consistent neutronic performance. Liquid hydrogen will naturally stabilize to a high parahydrogen ratio, but the conversion requires 3-7 days to complete (the “satisfactory” parahydrogen level varies between various beamline instruments). Ortho-to-parahydrogen convertor modules will be installed in the Cryogenic Moderator System (CMS) process loops as part of the Proton Power Upgrade Project (PPUP) at SNS. These catalysts will drive a …
Correlating In-Situ Monitoring Data With Internal Defects In Laser Powder Bed Fusion Additive Manufacturing, Andrew J. Harvey
Correlating In-Situ Monitoring Data With Internal Defects In Laser Powder Bed Fusion Additive Manufacturing, Andrew J. Harvey
Browse all Theses and Dissertations
The presence of defects within laser powder bed fusion (LPBF) parts can lead to reduced mechanical properties and life of components. Because of this, the ability to detect these defects within the parts is critical before the part is subject to its intended loading. Normally the parts are subjected to a quality analysis once they are completed however, this process is typically expensive and time consuming. A solution for these problems is to sense the creation of defects and pores in the parts in-situ, while the part is being fabricated. One proposed method of in-situ monitoring is visible spectroscopy to …
Synthesis Of Graphene Using Plasma Etching And Atmospheric Pressure Annealing: Process And Sensor Development, Andrew Robert Graves
Synthesis Of Graphene Using Plasma Etching And Atmospheric Pressure Annealing: Process And Sensor Development, Andrew Robert Graves
Graduate Theses, Dissertations, and Problem Reports
Having been theorized in 1947, it was not until 2004 that graphene was first isolated. In the years since its isolation, graphene has been the subject of intense, world-wide study due to its incredibly diverse array of useful properties. Even though many billions of dollars have been spent on its development, graphene has yet to break out of the laboratory and penetrate mainstream industrial applications markets. This is because graphene faces a ‘grand challenge.’ Simply put, there is currently no method of manufacturing high-quality graphene on the industrial scale. This grand challenge looms particularly large for electronic applications where the …