Theses and Dissertations from UMD
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New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM
More information is available at Theses and Dissertations at University of Maryland Libraries.
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Item Influence of Latinx Fathers' Behaviors, Cognitions, Affect, and Family Congruence on Youth Energy Balance-Related Health Outcomes(2022) Rodriguez, Matthew Rene; Roy, Kevin; Hurtado Choque, Ghaffar Ali; Family Studies; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)For decades, researchers have studied and theorized about the ways fathers interact with children and other members of the family. While this research provides important evidence, few father involvement studies have included Latinx fathers. Numerous father involvement conceptual frameworks have helped us understand the ways fathers interact with their families. Much of this research has focused on fathers' behaviors, but research suggests other domains need more investigation, such as fathers' cognitions and affect. Understanding these additional domains of father involvement can provide important evidence for understanding the ways fathers influence the health of children. Fathers influence the health of their children within different cultural and socio-political contexts. When considering Latinx father involvement within a social determinants of health approach, research has encouraged focusing on upstream factors that can contribute to the health of Latinx families. Addressing these upstream factors can shape the health and wellbeing of children. Currently, Latinx youth suffer disproportionately from obesity compared to all other racial and ethnic groups in the U.S. Through investigating Latinx father involvement, I fill an important gap by researching the extent to which Latinx fathers' affect, behaviors, and cognitions shape youth health outcomes. I also investigate theorized moderators that may influence the relationship between fathers' involvement and youth health outcomes. Using a cross sectional study design with a community-based sample of Latinx fathers and youth (ages 10-14) (n=193), I use latent moderation structural analyses to test the theorized causal mechanisms.Item Quantification of the Past and Future Anthropogenic Effect on Climate Change Using the Empirical Model of Global Climate, an Energy Balance Multiple Linear Regression Model(2020) Hope, Austin Patrick; Salawitch, Ross J; Canty, Timothy P; Atmospheric and Oceanic Sciences; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)The current episode of global warming is one of, if not the, biggest challenge to modern society as the world moves into the 21st century. Rising global temperatures due to anthropogenic emissions of greenhouse gases are causing sea level rise, extreme heat waves, droughts and floods, and other major social and economic disruptions. To prepare for and potentially reverse this warming trend, the causes of climate change must not only be understood, but thoroughly quantified so that we can attempt to make reasonable predictions of the future rise in global temperature and its associated consequences. The project described in this dissertation seeks to use a simple model of global climate, utilizing an energy balance and multiple linear regression approach, to provide a quantification of historical temperature trends and use that knowledge to provide probabilistic projections of future temperature. By considering many different greenhouse gas and aerosol emissions scenarios along with multiple possibilities for the role of the ocean in the climate system and the extent of climate feedbacks, I have determined that there is a 50% probability of keeping global warming beneath 2 °C if society can keep future emissions on the pathway suggested by the RCP 4.5 scenario, which includes moderately ambitious emissions reductions policies, and a 67% probability of keeping global warming beneath 1.5 °C if society can keep emissions in line with the very ambitious RCP 2.6 scenario. These probabilities are higher, e.g. more optimistic, than similar probabilities for the same scenarios given by the most recent IPCC assessment report. Similarly, we find larger carbon budgets than those from GCM analyses for any warming limitation target and confidence level, e.g. the EM-GC predicts a total carbon budget of 710 GtC for limiting global warming to 1.5 °C with 95% confidence. The results from our simple climate model suggest that the difference in future temperatures is related to an overestimation of recent warming by the IPCC global climate models. We postulate that this difference is partially due to an overestimation of cloud feedback processes in the global climate models. Importantly, though, I also reaffirm the consensus that anthropogenic emissions are driving current warming trends, and discuss both the effects of shifting the energy sector toward increase methane emissions and the timeline we have for emitting the remainder of our carbon budget – less than a decade if we wish to prevent global warming from exceeding the 1.5 °C threshold with 95% certainty.Item Energy Balance, Water Balance, and Plant Dynamics of a Sloped, Thin Extensive Green Roof Installed in the Mid-Atlantic Region of the United States(2014) Tjaden, Scott William; Tilley, David; Environmental Science and Technology; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)Vegetated extensive green roofs can reduce peak runoff amounts during rain events. As the desire to install green roofs expands beyond roofs with little slope to those with steeper slopes, often found on residential homes, there is a need to understand how slope affects runoff. WaterShed, the University of Maryland's winning entry in the 2011 U.S. Department of Energy Solar Decathlon competition, is used as an applied research site where studies like the runoff analysis can be completed, while helping to promote and demonstrate environmental sustainability and energy consumption efficiency. Instrumentation installed on the roof will allow high-resolution data analysis, producing hydrographs. The research has related the sloped green roof to different moisture holding capacities throughout the different elevations, resulting in a unique energy balance for the installed green roof. The thin substrate did not significantly contribute to overall runoff reduction, rather it helped to reduce the overall peak runoff and elongate the runoff lag after a rain event. This living technology's performance over time in a new application to sloped roofs is crucial both to ensure regulatory standards are met and to provide feedback for future improvements to the design and technology itself.