LOUIS University of Alabama in Huntsville
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Terra Australis Incognita: Captain Cook\u27s Dismissal of a Southern Continent
Get PDFFor centuries, many believed that a southern continent, Terra Australis Incognita, must exist to offset the landmasses in the Northern Hemisphere. In the late 1700s the British Admiralty sent Captain James Cook on his second voyage aboard the HMS Resolution to search for this southern continent. During this expedition, Cook became the first explorer to cross the Antarctic Circle, as he navigated through the high latitudes to find evidence of land. After repeated encounters with pack ice over the three years, he concluded that if a continent existed, it was inaccessible and of no commercial value. This conclusion brought British Antarctic exploration to a halt until the 1820s.https://louis.uah.edu/honors-399/1018/thumbnail.jp
A Monstrous Reflection: \u3ci\u3eFrankenstein\u3c/i\u3e as a Mirror of Mary Shelley\u27s Life
Get PDFMary Shelley’s Frankenstein is intertwined with the personal struggles and passions that defined her life. Shelley’s complex relationships and social defiance played a pivotal role in shaping her greatest literary achievement. The novel’s exploration of isolation, creation, and the consequences of unchecked ambition reflects Mary’s experiences with personal loss, social rejection, and the struggle to find her place within a society that often sought to suppress her. In this way, Frankenstein serves as a personal reflection of Mary’s inner world.https://louis.uah.edu/honors-399/1029/thumbnail.jp
Development and Optimization of a Penning Ion Source for Neutron Generator Applications
No full texthttps://louis.uah.edu/rceu-hcr/1487/thumbnail.jp
Momentum-Based Calibration for Total Impulse Measurement of Detonation-Based Thruster Performance
No full texthttps://louis.uah.edu/rceu-hcr/1489/thumbnail.jp
Addressing the Needs of the Unhoused Population with Education and Wound Care Kits Based on Input from Healthcare Professionals
No full texthttps://louis.uah.edu/rceu-hcr/1491/thumbnail.jp
Project DIAL Designing Instruction for Academic Literacies
No full texthttps://louis.uah.edu/rceu-hcr/1503/thumbnail.jp
Investigation of the Aerodynamic Performance of Bridge Cable under Gust Conditions
No full texthttps://louis.uah.edu/rceu-hcr/1505/thumbnail.jp
Affordability culture in practice : survey validation through a socio-technical lens
No full textAffordability has been a key directive in engineering projects as organizations seek to develop larger and more complex systems on stable or reduced budgets. This dissertation proposes a socio-technical framework of affordability to evaluate current affordability practices in organizations. Socio-technical frameworks have been used in complex organizations due to the ability to examine both social aspects as well as technical aspects as interconnected organizational components, yet previous research is lacking when attempting to approach affordability from this perspective. This research aimed to bridge this gap by validating a survey that examines affordability from both social and technical perspectives to gain a deeper understanding of the dimensionality of affordability in organizations. Using survey data from NASA MSFC, exploratory and confirmatory factor analysis was conducted to examine the dimensionality of affordability, while measurement invariance testing was implemented using a separate set of data obtained through the online participant recruitment platform CloudResearch. Results from this dissertation indicated that while the dimensions of the survey were not socio-technical in nature, a unidimensional survey focusing on affordability culture was validated. This validation also held up during measurement invariance testing, indicating validation across differing group types. This dissertation provided a novel approach to affordability in addition to a validated affordability survey, allowing those in leadership and management positions to apply a similar approach to evaluate strengths and weaknesses related to their organization’s affordability practices
Ammonium perchlorate manufacturing effects on propellant burning rate
No full textThis thesis investigates the effect of ingredient variations on the burning rate of reduced smoke, low burning rate composite solid propellant. The effort focused on identical propellant formulations which presented significant burning rate differences correlated with the ammonium perchlorate (AP) source. A series of 1-gallon propellant mixes were prepared and tested utilizing both Manufacturer A and Manufacturer B ammonium perchlorate to investigate the propellant burning rate and pressure exponent shift anomaly and correlate those findings to the differing ingredient properties between the two AP lots. Each propellant mix was evaluated for burning rate utilizing subscale test motors and a scanning electron microscope characterized the raw AP and cast propellant surfaces. SEM images of the cast propellant surfaces showed cracking of the Manufacturer B AP indicating that the pressure exponent shift and burning rate increase observed could result from AP fracturing during propellant mixing
Evaluating sequential inference via Poisson and change-point frameworks
No full textSequential testing reduces sample size and costs compared to fixed-sample approaches by allowing decision making during data collection. This thesis investigates sequential methods for Poisson processes and change-point detection. Wald’s sequential probability ratio test (SPRT) and efficiency measures are developed. Practical applications of the SPRT are studied, from detecting noisy sources to classification algorithms. The MaxSPRT is derived, and its critical value algorithm is optimized. The MaxSPRT, a Bayesian SPRT, Wilk’s generalized likelihood ratio test, and the Cash statistic are examined. Various change-point algorithms are surveyed, including Shewhart control charts, cumulative sum methods, homogeneity tests, and multiple change-point approaches. These are compared via the Nile River dataset, a Poisson example, and an online change-point detection implementation. Alpha spending functions are compared for their impact on sequential testing and mitigation of false alarms due to repeated hypothesis testing. Future research will investigate Poisson and Bayesian-based sequential analysis and change-point algorithms