Digital Commons Network^™

Experimental Investigation Into Utilizing Synthetic Jet Actuators To Suppress Bi-Modal Wake Behavior Behind An Ahmed Body, Daniel Jacob Baratta

Master's Theses

Testing done on the flat-back Ahmed Body and other bluff bodies has shown the existence of a bi-stable reflectional symmetry-breaking wake at Reynolds numbers ranging from 340 to 2.41 x 10⁶. Several methods of flow control, both active and passive, have been used to improve the efficiency of the Ahmed body but their effect on the bi-stable nature of the wake has not been investigated. This work details the experimental investigation done to determine if piezoelectrically driven synthetic jet actuators are capable of suppressing the bi-stable wake effects observed behind the Ahmed Body. The synthetic jets were designed …

Utilizing Trajectory Optimization In The Training Of Neural Network Controllers, Nicholas Kimball

Master's Theses

Applying reinforcement learning to control systems enables the use of machine learning to develop elegant and efficient control laws. Coupled with the representational power of neural networks, reinforcement learning algorithms can learn complex policies that can be difficult to emulate using traditional control system design approaches. In this thesis, three different model-free reinforcement learning algorithms, including Monte Carlo Control, REINFORCE with baseline, and Guided Policy Search are compared in simulated, continuous action-space environments. The results show that the Guided Policy Search algorithm is able to learn a desired control policy much faster than the other algorithms. In the inverted pendulum …

Development Of A Tailored Flight Test Approach For Small Unmanned Aircraft Systems, Neil A. Wolfe

Master's Theses

This document contains the details of a study conducted to determine an effective performance flight test approach specifically for small Unmanned Aircraft Systems (sUAS). This was done by taking proven procedures and documentation from the FAA and the Air Force for manned aircraft and tailoring them specifically for use with sUAS flight test programs. A ‘sUAS Flight Testing Handbook’ was created from the proceedings to aid commercial organizations and recreational developers conducting sUAS research without access to flight test experience. A performance flight test program was conducted with the AeroVironment RQ-20 Puma sUAS using the developed approach to verify that …

Millimeter Wave Radar Object Detection Through Frequency Selective Surfaces, Jacob D. Trevithick

Master's Theses

Millimeter wave (mmWave) radar systems are a leading technology in autonomous vehicle object sensing. The radar’s ability to detect surrounding objects is critical to its performance. One method of increasing object detection performance is to enhance object visibility. Frequency selective reflectors can increase object visibility. This work examines the performance of a mmWave 77 GHz radar system developed by Texas Instruments in conjunction with frequency selective surfaces. Two bandpass frequency selective surfaces are designed and fabricated using a loaded cross aperture configuration to analyze their application to object detection. The chosen design frequencies are 8 GHz and 79 GHz. The …

A Comparison Of Crushing Parameters Of Graphite Composite Thin-Walled Cylinders Cured In Low And High Pressures, Trenton John Matson

Master's Theses

Out-of-Autoclave (OoA) processes for manufacturing aerospace-grade parts needs to be better understood to further the development and success of industries that are manufacturing reusable launch vehicles, military and commercial aircraft, and spacecraft. Overcoming the performance limitations associated with OoA, also known as low-pressure prepreg curing, methods (void count, energy absorption, etc.) will help decrease the costs associated with aerospace composite manufacturing and the negative environmental effects correlated with high-pressure composite curing methods. Experimental, theoretical, and numerical approaches are used to explore both low and high-pressure curing cycles and how the two different processes affect final cured parts. Quasi-static uniaxial compression …

Evaluation Of Chilling Efficiency, Meat Tenderness, And Microbial Analysis Of Broiler Carcasses Using Sub-Zero Saline Solutions, Samira Viliani

Master's Theses

The poultry industry is seeking an advanced chilling system that can improve chilling efficiency, microbial safety, and water consumption without compromising meat quality. The objective of this study was to evaluate the effects of sub-zero saline chilling methods on chilling efficiency, breast fillet tenderness and microbial reduction of broiler carcasses. Following evisceration and rinsing, broiler carcasses were randomly assigned to one of three chilling solutions: 1) 0% salt or ice water control (0% NaCl/0.5^oC), 2) 3% salt (3% NaCl/-1.8^oC), and 3) 4% salt (4% NaCl/-2.41^oC) solutions. Broiler carcasses in sub-zero saline solutions reached the …

The Effects Of Cluster Thinning On Vine Performance, Fruit, And Wine Composition Of Pinot Noir (Clone 115) In The Edna Valley Of California, Paul F W Mawdsley

Master's Theses

A three-year study was conducted at a commercial vineyard site in California’s Edna Valley AVA to evaluate the physiological and agronomical effects of the timing of cluster thinning on Pinot noir (clone 115) grapevines. Vines were thinned to one cluster per shoot at three selected time-points during the growing season (bloom, bloom + 4 weeks, bloom + 8 weeks), and fruit from each treatment was harvested and made into wine. Across all growing seasons, yield decreased 43% in thinned vines relative to un-thinned control vines. No effect of cluster thinning or interaction with growing season was found in vine shoot …

Predictors Of Ransomware From Binary Analysis, Aaron M. Otis

Master's Theses

Ransomware, a type of malware that extorts payment from a victim by encrypting her data, is a growing threat that is becoming more sophisticated with each generation. Attackers have shifted from targeting individuals to entire organizations, raising extortions from hundreds of dollars to hundreds of thousands of dollars. In this work, we analyze a variety of ransomware and benign software binaries in order to identify indicators that may be used to detect ransomware. We find that several combinations of strings, cryptographic constants, and a large number loops are key indicators useful for detecting ransomware.

Floral Preformation In The Warming Boreal Forest: The Effects Of Temperature On The Development Of Vaccinium Vitis-Idaea, Eileen Schaub

Master's Theses

The boreal forest is experiencing climate change at twice the rate of other regions. Although changes in flowering phenology are a known consequence of warming temperatures, much is unknown about the effects of temperature anomalies on floral development. Boreal angiosperms preform flowers a year or more in advance and are consequently subject to varied environmental conditions across that time. My thesis examines the effects of temperature on floral development in order to understand how boreal taxa will respond to climate change.

Collection of Vaccinium vitis-idaeafrom natural populations in Fairbanks, Alaska was carried out over the growing seasons of 2017 …

Identification Of Factors That Influence The Cell Density Dependent Growth Of Porphyromonas Gingivalis, Archana Palakkal Meethil

Master's Theses

No abstract provided.

Liquid Crystalline Brush-Like Imidazolium Co-Polymer Membranes For Energy Conversion, Edirimuni Iyomali Abeysekera

Master's Theses

Anion exchange membrane (AEM) research is primarily focused to develop suitable AEMs with high ion conductivity for high pH and high-temperature environments used in water electrolysis and fuel cells. To address these issue research has been done on improving the ion exchange head group to obtain high ion conductivity and designing a rational polymer architecture to improve chemical and mechanical stability.

Most widely used ionic head groups are based on quaternary ammonium ions due to its high ion conductivity. However quaternary ammonium ion containing membranes degrades with time resulting in low ion exchange capacity (IEC) and low alkaline stability due …

Community Attitudes Toward Complementary, Alternative And Integrative Medicine In North Hartford, Connecticut, Andria Matthews

Master's Theses

Background: This study explores the attitudes of residents of North Hartford, CT toward Complementary, Alternative and Integrative Medicine. Methods: Twenty-five semi-structured, 10-15 minute in-person interviews were conducted at five sites over a two-week period in March 2019. Results: Few respondents were familiar with the term “Integrative Medicine.” Familiarity with modalities such as massage was higher (92%). Massage therapy was most often tried in the past (56%). Meditation and relaxation and yoga were the most frequently requested offerings. Cost, transportation, time of day and day of week, all emerged as potential barriers to participation. Pain-related complaints were prevalent amongst respondents. Conclusions: …

The Effects Of Creative And Cognitive Exercises On Body Balance, Gina Digiacomo

Master's Theses

No abstract provided.

Predictors Of Appraisal And Coping Profiles In Response To Workplace Incivility Experiences, Courtney Pfeifer

Master's Theses

At least seventy percent of employees report experiencing an incivility incident in recent years (Cortina, 2008), and incivility has been linked to negative outcomes, such as stress and turnover (Beattie & Griffin, 2014). The current study applies Lazarus and Folkman’s (1984) transactional model of stress to examine predictors of incivility targets’ patterns of appraisal and coping. In particular, I propose that the frequency with which incivility occurs, resilience, and work contexts, such as organizational justice and civility norms, can influence the target’s appraisals and coping. Additionally, incivility research has utilized different time frames to examine incivility and predictors (Cortina, Kabat-Farr, …

An Examination Of Whether Perceived Stress Mediates The Effects Of Income On Engagement And Weight Loss Loss Outcomes In An Online Behavioral Weight Loss Intervention, Kristen Volz

Master's Theses

Individuals with lower income have higher rates of obesity and are underrepresented in weight loss treatment. Moreover, when individuals with lower income do enroll in face-to-face interventions, their adherence and weight loss outcomes are worse due to known treatment barriers, including unreliable transportation, lack of childcare, and scheduling constraints associated with multiple jobs and unconventional work hours. Because online interventions are asynchronous and can be accessed any time of day, they hold significant promise for reducing treatment barriers and improving adherence and weight loss outcomes in lower income populations. However, one drawback of online interventions is that they are self-directed, …

3d Printed Robotic Arm As A Developmental Platform For Education, Samuel Soifer

Master's Theses

Modern engineering courses provide students with exposure to the theory and derivations of problems. Rarely do these courses require students to apply their theoretical knowledge to problems that an engineer would face in industry, thus leaving a gap in a student’s education. In order for future engineers to effectively prepare to apply their engineering education to problems in industry, it is vital that engineering students take courses in which they can learn how to integrate different engineering topics and apply theoretical knowledge to industry problems.

The objective of this thesis is to develop an educational platform that both integrates and …

Experimental Investigation And Numerical Simulation Of Loop Thermosyphons, Sara A. Kloczko

Master's Theses

A Non-phase change heat pipe (NPCHP) with no wick was proposed recently as a new heat pipe which is not dependent on a wick or phase change at steady state operation and where the heat transfer is driven by the pressure response to a heat input, rather than phase change. The NPCHP is not a new device as suggested but is a loop thermosyphon with very high fill ratio. This effort focuses on proving the NPCHP, as an overfilled loop thermosyphon, is an effective heat transfer device through experiments and numerical simulations. An analysis of the operation and effectiveness of …

Monitoring Hydrologic Factors Influencing Bog Turtle Persistence At A Site In Connecticut, Julie Webb

Master's Theses

A calcareous fen that supported one of the few populations of bog turtles (Glyptemys muhlenbergii) in Connecticut has been shown by the Connecticut Department of Energy and Environmental Protection (DEEP) to have declined with no sitings reported since 2004. This study evaluates the current hydrology of the fen in question to provide insight as to why it may be no longer habitable. Possible reasons for turtle decline identified at the outset of the project included salt contamination from deicing of a state road, periodic flooding from seasonal storms, nutrient and pesticide runoff from the draining farms, potential drying …

Tidally Resolved Carbon And Nutrient Exchange Through Eastern Long Island Sound, Allison L. Byrd

Master's Theses

Long Island Sound (LIS) is an urbanized estuary that undergoes seasonal hypoxia in its western and central regions. Approximately 90% of the water exchange between LIS and the adjacent continental shelf, the Middle Atlantic Bight (MAB), occurs at the eastern LIS (ELIS) boundary. The contribution (import/export) of carbon (C), nitrogen (N) and phosphorous (P) from ELIS to the MAB has not been well constrained, though it is important for the management of LIS and coastal biogeochemical budgets. As a tidal estuary, sampling efforts are subject to a degree of natural variation that is currently not well quantified. To assess the …

Coastal Adaptation To Sea Level Rise: Effects Of Residential Proximity To The Coast, Climate Change Perceptions, And Attitudes Toward Government For Valuing Ecosystem Outcomes, Kristin B. Raub

Master's Theses

In a changing climate, there has been an increase in the frequency and severity of hazards impacting coastal communities. Traditionally, hard defenses (sea walls) have been constructed to protect these communities, even though they can have negative impacts throughout the nearby coastal environment. There has been increasing consideration of alternative shoreline protection strategies, such as living shorelines, or managed retreat. However, each of these coastal management strategies comes with a series of monetary, environmental, and social tradeoffs making individual preferences dependent on multiple scenario-specific attributes. Ecosystem service valuation is a useful tool for understanding how humans relate to the environment …

Constraining The Miocene Slip History Of The Southern San Andreas Fault Through Sedimentary Provenance Analysis, Jacqueline Giblin

Master's Theses

Tectonic reconstructions of the southern San Andreas Fault (SAF) system (California, USA) have produced conflicting estimates of cumulative strike-slip offset from middle Miocene to present. We propose that the sedimentary record can resolve both spatial and temporal development of this system, allowing us to reconstruct the paleogeography of this system in the past 10 Ma. An important, but unresolved consideration is whether the Miocene Coachella Fanglomerate, located on the northwestward migrating Pacific side of the dextral SAF transform plate can be correlated to the Bear Canyon Conglomerate located ~200 km to the southeast in the foothills of the southerly Chocolate …

Influence Of Endodontic Sealers On Dentin Strength In Endodontically Treated Teeth, Andrew Fossum

Master's Theses

Introduction: Gutta-percha is not compressible and tooth fracture can be initiated when force is applied to the gutta-percha. The aim of this study was to apply a hoop stress to roots which have been obturated with either gutta-percha and no sealer, gutta-percha and AH Plus sealer, gutta-percha and EndoSequence Bioceramic Sealer, gutta-percha and Tetranite®, or Tetranite® and no gutta-percha until fracture occurred and then compared the failure stresses. Methods: Teeth were divided into five groups based on the sealer type used, no sealer used or only sealer used. The teeth were then sectioned into 2mm thickness discs and load was …

The Ecology And Evolution Of The Freshwater Turtles Of Southern Mississippi, Gabrielle Berry

Master's Theses

Turtles are one of the most threatened group of animals in existence today. The Southeastern United States is one of two global biodiversity hotspots for turtle species, including the state of Mississippi, where over 30 species can be found. However, very few studies have occurred within the state. This lack of research is even more startling given the ongoing decline, or even extirpation, of numerous turtle species across the world, due to a number of factors, including habitat degradation, and harvest for food or the pet trade.

The overarching goal of this project was to perform a species inclusive freshwater …

Their Culture Against Them: The Assimilation Of Native American Children Through Progressive Education, 1930-1960s, Jamie Henton

Master's Theses

The failure of the Bureau of Indian Affairs (BIA) to successfully assimilate Native Americans, especially Native children through education tactics such as boarding schools, led to a shift in the mid-twentieth century for pro-Indian reform. From the 1930s through the 1950s, BIA education reformers pursued progressive education. They imagined progressive education would allow the BIA to use Native American traditions and culture to educate and mold Native students into modern contributing American citizens. To appeal to students, the BIA commissioned a series of educational materials, primarily children’s books, designed to use Native culture to teach children how to adapt to …

Perceptions On The Effectiveness Of Diversity And Inclusion Hiring: Are We Really Getting Ahead? [2019], Deidre D. Pierson

Master's Theses

Diversity and inclusion hiring in NCAA Division III athletic departments has seen some improvement over the last two decades, but questions remain on whether we are really getting ahead. There continues to be a lack of diversity, particularly in private Northeast institutions. The purpose of this study was to determine the perceived effectiveness of hiring practices and initiatives utilized by athletics departments. The study utilized tenants of critical theory which supported the in-depth questioning and centering of the lived experiences of participants. This study used semi-structured interviews of nine Division III female head coaches of women’s sports to examine their …

Emotion Reactivity, Emotion Dysregulation, And Non-Suicidal Self-Injury Among At-Risk Adolescents: A Multiple Mediation Analysis, Paula N. Floyd

Master's Theses

Non-suicidal self-injury (NSSI) is defined as deliberate self-inflicted damage to bodily tissue without the intent to die. NSSI has been identified as a major health concern, as it is related to both poor psychosocial outcomes and increased suicide risk. NSSI is especially important to understand among adolescents, as age of onset is typically during adolescence and prevalence rates are highest among this age group. One of the most well-established correlates of NSSI is emotion dysregulation. While many studies have examined emotion dysregulation and its subcomponents in relation to self-injury, there has been far less work devoted to factors that may …

Extended-Range Oscillations And The First Sharp Diffraction Peak In Amorphous Silicon: A Systematic Study, Devilal Dahal

Master's Theses

The first sharp diffraction peak (FSDP), which characterizes the static structure factor of many glassy systems near the wave vector region of 1-2 Å^-1 has been observed depending on the temperature, pressure and the degree of annealing of the system. The presence of the FSDP is indicative of the intermediate range order (IRO). In current work, we study the role of the extended- range oscillations on the parameters of the FSDP, i.e., intensity, position, area, and the full width at half maximum (FWHM) by using high-quality simulated models of amorphous silicon. The radial distance up to half of the …

Spring-Guided Electromagnetic Vibrations Energy Harvester, Ghufran Jaber Aldawood

Master's Theses

In recent years, vibration based energy harvesting techniques showed a promising alternative to power wireless sensor networks (WSN). Billions of low power sensors are currently used widely in wireless sensor networks (WSN) and the Internet of Things environment (IoT). These sensors are currently powered by a traditional power source, i.e. a disposable battery. Vibrations are an abundant source of kinetic energy that can serve as the power source for these sensor nodes. This approach eliminates the necessity for frequent battery replacement due to their short-life span and hazardous disposal process. The adverse and irreversible effect from the disposal of these …

Heat Activation Of Bacillus Anthracis Persists Over A Seven Day Period, Nathan T. Ross

Master's Theses

Bacteria of the Bacillus genera are capable of forming dormant and resilient cells called spores in response to starvation. Spores can break dormancy in the presence of nutrients in a process called germination. Historically, spores are exposed to sublethal heat treatments to increase the extent and rate of germination. This process is known as heat activation (HA). Previous studies on Bacillus species indicate the effects of HA are reversible after 72 hours. After this time period, the spores must be reactivated. However, spores of Bacillus anthracis, a member of the Bacillus family, have not been tested to see how long …

Metal Related Nanoparticles' Physical Behaviors In Different Physiologica Environments, Muhetaer Tuerhong

Master's Theses

In the past decades, the development of nanotechnology has had tremendous successes in material science. In this technology, the pertinent materials are used at the intermediate scale between individual molecules and their size in the nanometer region(1-100nm) compared to bulk materials. This nanoscale size provides a larger surface area; therefore, nanoparticles would be perfect essential components of nanotechnology. The reduced size of nanoparticles has a larger surface ratio to volume, which can modify their chemical, mechanical, structural, and electrical properties.

In this study, the main goal is to test different metal related nanoparticles, such as CuNPs (Copper nanoparticles), FeNPs (Iron …