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Superalloy Metallurgy A Gleeble Study Of Environmental Fracture In Inconel 601, Alan C. Demmons

Master's Theses

At temperatures above 0.5 Tm and in aggressive atmospheres predicting alloy performance is particularly challenging. Nickel alloys used in regimes where microstructure and properties are altered dynamically present unique requirements. Exposure may alter properties with unexpected early failure. The Gleeble is a valuable tool for investigation and simulation of thermo-mechanical properties of an alloy in various regimes up to the threshold of melting. In this study, four regimes of temperature and strain rate were simulated in an argon atmosphere to both investigate and document normal and abnormal failure modes. Commercial Inconel 601 was tested in selected regimes and in two …

Ncma Groundwater Model Using Usgs Modflow-2005/Pest, Brian Matthew Wallace

Master's Theses

A numerical model for the NCMA aquifer complex is presented. The objective of the study is to develop a numerical groundwater model for the NCMA aquifer system to enhance the understanding of subsurface groundwater flow. Infiltration, streamflow, pumping, and return flows are implemented to characterize the aquifer complex over time. The numerical model is calibrated to municipal and monitoring well data, average monthly water balances, and hydraulic contours. Transient aquifer inflows and outflows are assessed in the results of the study and are compared to balance terms from previous studies. The 2007 Todd Engineers Study subsurface inflows and outflows generate …

The Relationship Between Secondhand Tobacco Smoke Exposure And Asthma Severity Among The Pediatric Population In Connecticut, Christtopher Hammel

Master's Theses

Background: Secondhand tobacco smoke exposure (STSE) has been associated with an increased incidence of asthma exacerbations, but the relationship between STSE and asthma severity is less clear.

Objective: To determine whether STSE is associated with asthma severity in children living in Connecticut who have physician-diagnosed asthma and to examine whether it is modified by common markers of community-level socioeconomic status (SES) using the Five Connecticuts study.

Methods: The Easy Breathing database identified 32,691 children with physician-diagnosed asthma living in 161 towns in Connecticut. This large database was linked by participant zip code to census data, allowing classification by community, with …