Digital Commons Network^™

Identifying And Quantifying Sediment Sources And Sinks In The Root River, Southeastern Minnesota, Justin Collin Stout

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Fine sediment, normally understood to refer to sand, silts, and clays; is a natural constituent in all rivers. When in excess this fine sediment can degrade the habitat for aquatic life in these rivers, and carry with it many pollutants and nutrients which can cause adverse effects on wildlife and human populations.

Understanding how this fine sediment moves through a river system, from erosion off of hillslopes, transport through the river, and finally export from the mouth of the system is vital part to land and river management. However, predicting how fine sediment moves through a system is a difficult …

Carbon Sequestration On Utah Rangelands: A Landowner Perspective, Seth Cook

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Carbon sequestration is the removal of carbon dioxide from the air and storing it in plants and soil through natural processes. Rangelands can be managed to sequester carbon and mitigate climate change. Supported by the Utah Agricultural Experiment Station, this study assessed Utah rangeland owners’ perceptions of carbon sequestration and explored factors influencing their likelihood of participation in relevant programs. Data were collected through interviews and a statewide survey of Utah rangeland owners. Over two-thirds of respondents were aware of carbon sequestration and viewed it positively. Those who thought the climate had been changing over the past 30 years tended …

Cattle Browsing Sagebrush Steppe During Fall: Effects On Plant Community Structure And Influence Of Experience On Cattle Foraging Behavior And Body Weights, Charles A. Petersen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Historic and repetitious spring grazing by livestock, combined with altered fire regimes, has increased the density and abundance of big sagebrush and reduced the frequency of perennial grasses and forbs on many western landscapes. Periodic disturbance is critical for maintaining and improving sagebrush ecosystems. Compared with traditional disturbances – chemical, mechanical, and fire – strategic grazing with livestock offers several benefits. They include creating locally adapted cattle that can rejuvenate sagebrush steppe, which reduces costs associated with mechanical and chemical rejuvenation treatments and feeding cattle during winter, the major cost of ranch operation.

I evaluated the practicality of strategically timed …

Integration Of Water-Column And Benthic Processes And Their Effect On Dissolved Oxygen Fluctuations In Small Northern Utah Streams, Ruba A. Mohamed

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Dissolved oxygen (DO) is an important element for aquatic organisms as it is used for respiration by most organisms. Certain concentrations of DO are required in aquatic ecosystems depending on the type and needs of the aquatic organisms. In general, DO concentrations less than 5 mg/L stress many types of aquatic organisms including fishes. In order to maintain DO concentration above the stress level, respiration is one of the factors that should be maintained by controlling the excess growth of aquatic plants. Many factors cause the outbreak of plant growth, including abundance of nutrients and presence of sun light. In …

Characterization Of The Function And Interaction Of Proteins Involved In Exopolysaccharide Synthesis In Streptococcus Thermophilus, Streptococcus Iniae, And Lactococcus Lactis Subsp. Cremoris, Angela D. Cefalo

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Many microorganisms produce capsules of repeating sugar units that surround the cell called exopolysaccharides. The synthesis of these capsules is a complex process that involves numerous protein components. A better understanding of the way these proteins function and interact with one another will benefit many industrial processes by aiding in the construction of bacterial strains with enhanced properties and could also lead to new treatment strategies against microbial pathogens in which capsule production is important in their ability to cause disease. In this study, the function of one of the proteins involved in the regulation of capsule synthesis in the …

Exitus: An Agent-Based Evacuation Simulation Model For Heterogeneous Populations, Matthew T. Manley

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Evacuation planning is important for businesses given the continuing occurrence of both natural and human-caused disasters throughout the world. Unfortunately, the traditional fire-drill approach is impractical for many large organizations but especially those responsible for airports and sports arenas. The purpose of this research was to develop a new computer program capable of simulating large scale evacuations in such buildings. The program, called Exitus, is different from other evacuation simulators in the way it considers the physical, psychological, and social characteristics of individuals with disabilities during emergency situations.

In this research, Exitus was used to simulate evacuations of three buildings …

Evaluating Complementary And Alternative Medicine (Cam) Utilization In A College Sample: A Multisite Application Of The Sociobehavioral Model Of Healthcare Utilization, Kimberly M. Pratt

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The use of complementary and alternative medicine (CAM) among U.S. college students and the general public is substantial and growing; however, research on the characteristics of college students who use CAM and the factors that influence their decision to use CAM is scarce. Even fewer studies have explored such factors within the framework of an empirically supported theory. The college years are seen as an important time for developing long-lasting health behaviors and in many ways college students play an important role in setting the foundation for future healthcare. Thus, it is important for healthcare practitioners to have a clear …

Adaptive Re-Segmentation Strategies For Accurate Bright Field Cell Tracking, Nare Hayrapetyan

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Cell migration is central for many fundamental biological processes and development of multi-cellular organisms. The failure of cells to migrate or migration of cells to inappropriate locations during embryo development can result in life threatening consequences such as brain malfunctions. In adults, cell migration plays an important role in wound healing and immune responses. Failure in these processes can have dramatic medical implications and can lead to vascular diseases and tumor formation. Therefore, studying cell migration is critical to helping prevent and cure diseases.

Cell migration is usually studied by observing cells photographed through a microscope at regular time intervals. …

Latent Classes Of Self-Reported Adolescent Depression In A Clinical In-Patient Population, Jonathan F. Doti

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The depressive disorders are among the most common mental health problems with substantial financial and quality-of-life costs. Depression has generated considerable debate as to the underlying structure/taxonomy and continues to be frequently debated. Adolescents who meet diagnostic criteria for major depressive disorder often experience anxiety (and vice versa). Therefore, understanding the underlying structure of depression as well as the co-occurrence of anxiety in a population of adolescents adds to our conceptual understanding of these disorders and facilitates treatment clarity.

This investigation sought to investigate the following research questions for adolescents’ self-reported symptoms of depression, and self-reported symptoms of depression and …

Cross Flow Filtration For Mixed-Culture Algae Harvesting For Municipal Wastewater Lagoons, Misheka Wilson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The City of Logan Environmental Department has a goal to remove chemicals from the municipal wastewater that can cause algae growth in Cutler Reservoir that will impair use for recreation. The proposed plan to accomplish the goal is to grow algae within the 460-acre Logan Lagoon wastewater system, and then remove the algae from the treated wastewater that enters Cutler Reservoir. The collected algae may be used to produce biodiesel to fuel the City solid waste vehicles. The City will coordinate the development and implementation of this project with the assistance of the Utah State University Biological Engineering Department. The …

Planning, Acting, And Learning In Incomplete Domains, Christopher H. Weber

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The engineering of complete planning domain descriptions is often very costly because of human error or lack of domain knowledge. Learning complete domain descriptions is also very challenging because many features are irrelevant to achieving the goals and data may be scarce. Given incomplete knowledge of their actions, agents can ignore the incompleteness, plan around it, ask questions of a domain expert, or learn through trial and error.

Our agent Goalie learns about the preconditions and effects of its incompletely-specified actions by monitoring the environment state. In conjunction with the plan failure explanations generated by its planner DeFault, Goalie diagnoses …

Modeling Spatial Surface Energy Fluxes Of Agricultural And Riparian Vegetation Using Remote Sensing, Hatim M.E. Geli

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Evapotranspiration (ET) represents the amount of water consumed by vegetation through transpiration plus the direct evaporation from the soil surface. Understanding the amount of ET is important as it represents a portion of fresh water that is consumed and not available for further use. ET is used as indication of how much water needed for agricultural activities. This research is aimed towards providing improved estimates of ET.

The technological advances in remote sensing provide us with images of the Earth’s surface from space, using satellites, and sometimes with more detail from aircraft. We used these data in …

Biochemical Characterization Of Sac9, A Putative Phosphoinositide Phosphatase In Arabidopsis Thaliana, And Its Role In Cellular Abnormalities, Almut H. Vollmer

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Since the early colonization of land by fungi and plants some 700 million years ago, plants have been continuously faced with changes in their environment. Unlike animals, plants are not free to move about, and can therefore not evade many stress factors. How plants sense and respond to their environment has been of interest not only to scientific research but also in more practical applications such as agriculture.

Signals (such as light or salinity) from the outside of plant cells trigger a flow of information to the inside of the cell. The final target for most of the information is …

Robust Computational Tools For Multiple Testing With Genetic Association Studies, William L. Welbourn Jr.

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The mapping of the human genome and the completion of the Human HapMap project over the past decade have significantly altered how research is conducted with respect to the genetic epidemiology of human disease. Study designs and analytic approaches have evolved rapidly from investigations involving relatively few targeted candidate genes to hypothesis-free genome-wide association studies, where thousands – and now even millions – of single molecular mutations are simultaneously analyzed to identify regions of the genome that may influence disease. As laboratory techniques continue to improve and costs decrease, the volume of genetic data will inexorably rise, and robust tools …

Outcomes And Presurgical Correlates Of Lumbar Fusion In Utah Workers' Compensation Patients: A Replication Study, Jessica M. Gundy

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Over the past 2 decades, lumbar fusion surgeries performed in the United States have increased dramatically, particularly for compensated workers. Costs for these procedures have also risen substantially in the past decade, primarily due to the use of more sophisticated surgical devices such as interbody fusion cages. While surgical instrumentation and technology may improve the rates of solid bony vertebral fusion, overall improvements in quality of life and pain outcomes related to this new technology are still inconclusive.

In collaboration with the Workers Compensation Fund of Utah (WCFU) and Utah State University (USU), a psychology professor, Dr. M. Scott DeBerard, …

Explaining The Paradox: Perceived Instructor Benefits And Costs Of Contributing To Massachusetts Institute Of Technology Opencourseware, Preston Paul Parker

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Massachusetts Institute of Technology (MIT) OpenCourseWare (OCW) project offers potential benefits and costs to three main categories of people: users, the
institute itself, and the instructors who provided the materials to the project. Little is known about the benefits and costs of the instructors, so that is what this study examines. Instructors put together the original educational materials and would seem to have the most to lose by contributing to OCW.

It appears that instructors recognize benefits of: (1) improved reputation, (2) networking, (3) supplementary opportunities, (4) improved course content, (5) course
feedback, (6) students accessing materials, and (7) …

Exploring Aspects Of Strong Remarriages, Marci Campbell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Remarriage is often studied with a focus on the difficulties associated with the complexities of remarriage. The focus of this study was to explore aspects of strong remarriages. Ten couples that had been remarried for 5 years were interviewed separately about their strong remarriage. Prevalent topics were compiled and organized into factors that contribute to a strong remarriage. These factors include: commitment, love, religion/spirituality, communication, compatibility, financial agreement, and physical intimacy. Additionally, expectations of remarriage were explored. The majority of the individuals expressed that their remarriage exceeded their expectations. A discussion of suggestions for future research is included.

A Study Of Mothers’ Perceptions And Practices Of Kindergarten Readiness, Kirsten Smith

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study was conducted to understand what mothers with children enrolled in a developmentally appropriate preschool program believe and are actually doing to help prepare their children for kindergarten, something of key importance, as kindergarten success is a foundation for later school success. There is very little research on the topic of parental perceptions and practices in kindergarten readiness and the transition into kindergarten.

A survey was sent home to 60 families who had their child enrolled in the Adele and Dale Young Child Development Laboratory at Utah State University during the 2010-2011 school year. In the survey, parents were …

Increasing The Retention Of Lipid-Soluble Components In A Curd Matrix, Megan Tippetts

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Megan Tippetts, under the direction of Dr. Silvana Martini at Utah State University, proposes to demonstrate that it is possible to increase the retention of lipid-soluble components (e.g. vitamin D) in a curd matrix (e.g. Cheddar cheese). This project was coordinated with the Western Dairy Center for the initial phase of the project.

The initial phase used vitamin D₃ fortified emulsions stabilized with a dairy-based emulsifier. The objective was to determine if vitamin D₃ delivered in an emulsion form to the milk before cheesemake would have higher retention in the cheese versus vitamin D₃ oil added directly …

The Relationship Between Salinity And Drought Tolerance In Turfgrasses And Woody Species, Nisa Leksungnoen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Both salt and water deficit make it difficult for plants to uptake water from soil. Thus, plants under those conditions may respond and deal with them similarly. The overall objectives of this study were to 1) determine visual appearance and physiological responses, and mechanisms to deal with salt and water deficit of turfgrasses and woody species, and 2) determine the relationship between salt and water deficit tolerance ability in those species.

Five turfgrass entries, ‘Gazelle’ and ‘Matador’ tall fescue (TF), ‘Midnight’ Kentucky bluegrass (KBG), PI368233 (Tolerant KBG), and PI372742 (Susceptible KBG), and three woody species, bigtooth maple (xeric-non saline), bigleaf …

Assessing And Enabling Independent Component Analysis As A Hyperspectral Unmixing Approach, Matthew R. Stites

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Perhaps the most common way to distinguish materials is by color. For example, this is typically how one determines, from some distance, whether a material on the ground is grass (green), soil (brown), or asphalt (black). To accomplish this, most digital cameras (along with the human eye) produce images that are comprised of three different colors, called spectral bands: red, green, and blue. The combination of these bands enables material discrimination. Working in the same way, but on a much larger scale, hyperspectral imaging sensors produce images that are comprised of hundreds of spectral bands. This combination of bands enables …

Social Organization And Decision Making In North American Bison: Implications For Management, Ryan A. Shaw

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Social organization varies widely among herbivores, and the level of social organization in bison is widely debated. I hypothesized that when mother-daughter relationships are allowed to develop, bison form long-term associations. In my study, 25 treatment mothers were selected from a free-ranging herd and kept together with their calves, while 25 control females had their calves forcefully removed. Treatment mothers and offspring had by far the greatest number of associations with a greater percentage of individuals with a half weight index (HWI) > 0.50. The strongest associations (HWI > 0.31) were among treatment mothers and their offspring. Moreover, these associations persisted over …

Systematics Of Multillidae (Hymenoptera) With Special Emphasis On Dasymutilla And Their Allies, Kevin A. Williams

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Velvet ants are solitary wasps that are excellent candidates as model organisms for studying evolutionary phenomena like mimicry and biogeography. They can also be used in conservation studies because of their local abundance. Their abundance, coupled with parasitic lifestyle on native pollinators, suggests they will be economically important as native pollinators are implemented more widely. Velvet ants, however, are rarely studied and their research potential is drastically hindered by lack of phylogenetic and taxonomic data and lack of interest in the scientific community. In this dissertation, I sought to overcome the hindrances to mutillid research with a holistic systematic research …

The Role Of Fine-Scale Habitat Associations In Structuring Spider Assemblages: Determinants Of Spatial Patterns In Community Composition, Stephanie M. Cobbold

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Ecologists strive to identify the mechanisms that drive the identity and abundance of species in different locations, because a better understanding of such factors enables them to better predict the effects of habitat modification on organisms, and to identify landscapes in which species are likely to benefit from conservation interventions. However, there is still no consensus on the mechanisms behind geographical variation in species diversity. The primary objective of this dissertation was to focus on spider assemblages to investigate how the fine-scale habitat associations of organisms may drive the composition of their communities at larger scales. Research was conducted in …

Spider Community Composition And Structure In A Shrub-Steppe Ecosystem: The Effects Of Prey Availability And Shrub Architecture, Lori R. Spears

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Habitat structure is cited as an important factor influencing organisms, but few studies investigate whether habitat structure interacts with other environmental variables to affect community dynamics. The purpose of this study was to determine, using field experiments, the importance of prey availability and shrub architecture on a spider community in northern Utah, USA. We were also interested in determining whether surrounding shrub architectures influence spider and prey responses.

Our results suggest that spider distribution, abundance, and biodiversity are influenced by shrub architecture. Shrub architecture influenced spiders both directly and indirectly via associated changes in prey availability. Spiders were also directly …

Problem Solving In Latino Families, Eliza Torres

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this dissertation is to learn if the quality of problem solving, parent engagement, and child engagement improve as a result of participating in a parenting intervention. The quality of problem solving was coded by independent observers watching a 5-minute videotaped task. Parent and child engagement were also coded by an observer and were evident in behaviors such as making eye contact, using good social skills, using humor, minimizing problems, and showing empathy were also rated by individual coders who were blinded to treatment/control groups. Each parent-child pair had a total of three scores, one for each variable …

Planning And Management Modeling For Treated Wastewater Usage, Leila Ahmadi

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Population growth, urbanization and water scarcity in many parts of the world has resulted in transfer of agricultural water to municipal and industrial users on one hand and excessive production of wastewater on the other hand. Due to importance of agriculture in food production and in the economy of many regions around the world,
water resources management and considering new water resources (such as treated wastewater) is critical.This study focused on analyzing the effects of population and
urban growth on water demand for various users and municipal wastewater quantity changes; as well as investigating the feasibility of wastewater reuse projects. …

Duckweed Uptake Of Phosphorus And Five Pharmaceuticals: Microcosm And Wastewater Lagoon Studies, Jonathan Bay Farrell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Utah State University students under the direction of Dr. R. Ryan Dupont, Environmental Engineering, have been enthusiastically involved in researching ways to improve wastewater treatment at the nearby Wellsville Municipal Sewage Lagoons. Wellsville City, along with several other Cache Valley communities, has experienced some problems with their current wastewater facility, particularly with phosphorus removal, which will become more difficult to address as the population increases in the future. Excessive phosphorus causes unappealing algae blooms in ponds and reservoirs while also posing a threat to local fish. Brittany Wilkes, Brett Housley, and Naho Orita first looked into reducing phosphorus discharge by …

Web Usage Mining: Application To An Online Educational Digital Library Service, Bart C. Palmer

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This dissertation examined how users of the Instructional Architect (IA; http://ia.usu.edu) utilized the system in order to find online learning resources, place them in a new online instructional activities, and share and use them with students. The online learning resources can be found in educational digital libraries such as the National Science Digital Library (NSLD; http://nsdl.org) or the wider Web. Usage data from 22 months of IA use were processed to form usage features that were analyzed in order to find clusters of user behavior using latent class analysis (LCA).

The users were segmented into two samples with 5–90 and …

Livestock Foraging Behavior In Response To Sequence And Interactions Among Alkaloids, Tannins, And Saponins, Tiffanny L. Jensen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

During the past several decades, people worldwide have expressed a growing interest in reconstructing ecosystems to enhance ecological, economic, and social values. Yet, to do so we must find ways to enhance biodiversity, environmental quality and the sustainability of grazing lands. In all these instances, plants are the glue that binds soils, water, herbivores, and people. However, monocultures or simple grass-legume mixtures are not always ideal for intensively managed pastures due to their seasonality, susceptibility to pests, and monotony of plant nutrients and toxins. All plants contain so-called “toxins,” more appropriately referred to as secondary compounds, which are crucial in …