Digital Commons Network^™

Evidence Of Multidecadal Recruitment In The Ocean Quahog, Arctica Islandica In The Western Atlantic Ocean, Sara M. Pace

Master's Theses

Ocean quahogs (Arctica islandica) are the longest-lived, non-colonial animals known today, with a maximum life span exceeding 500 years. Limited information is available regarding recruitment, making the sustainable management of this valuable fishery a challenge. The objective of this research was to describe the age structure and growth rates for four populations of ocean quahogs from the mid-Atlantic stock to evaluate long-term recruitment trends. Clams were sectioned for age estimation to develop population age frequencies. Initial colonization began approximately 175-250 years ago depending upon site. All sites experienced an increase in recruitment beginning in the late 1800’s to …

Textural Analysis Of Historical Aerial Photography To Determine Change In Coastal Marsh Extent: Site Of The Present-Day Grand Bay National Estuarine Research Reserve (Gbnerr), Mississippi, 1955-2014, Heather Michelle Nicholson

Master's Theses

Coastal marshlands are among the world’s most highly productive ecosystems but they have diminished greatly in the past several decades owing to sea-level rise and direct anthropogenic influences. An effective means of quantifying loss or gain in marsh area is through the use of aerial image data, which offers synoptic views of the landscape at decadal-scale sampling frequencies. However, a potential problem with older panchromatic, or black-and-white, imagery is the absence of multispectral information that might be used otherwise in remote identification of vegetation types. Nevertheless, the analysis of horizontal variability in image brightness values, or image texture, can be …

Potential Of Ozone And Hydroxyl Radicals To Degrade Emerging Organic Contaminants, Lisa Elaine Vance

Master's Theses

Advanced water treatment processes are necessary for the treatment of emerging organic contaminants. Traditional treatment processes do not filter or treat these contaminants causing humans and animals to come into contact and ingest them, both causing illness. Advanced oxidation processes are a good alternative method, but are cost and time intensive.

Previous research on ozone and hydroxyl radicals leads to the conclusion that they might be a vial option for advanced water treatment processes. To test the effects of ozone and hydroxyl radicals on the destruction of algae, ozonated phosphate buffer was mixed with Anabaena and modified BG11 culture media …

Strategies For Increasing The Release Of Pigments In Red Wine, Briana Heywood

Master's Theses

The perception of wine’s quality is directly influenced by its color. Anthocyanin molecules are responsible for imparting color to red wines. They are extracted from grape skins during alcoholic fermentation. This work compares the effects of three parameters: berry integrity, enzyme addition, and fermentation temperature, on phenolic compound extraction (total phenol, tannin and anthocyanin) during the production of Paso Robles’ Cabernet Sauvignon wine. Analyses on phenolic compounds were completed during alcoholic fermentation and barrel aging over the course of eighteen months. Berry integrity compared the degree of berry crushing (whole destemmed berries versus fully crushed berries). Results showed that phenolic …

Investigation Of Ammonia And Nitrate Removal From Municipal Wastewater Using Biowish, Emily Holland

Master's Theses

This research entails investigation of ammonia, nitrate, and nitrite removal from wastewater using a proprietary blend of bacteria known as BiOWiSH^TM. The degradation rates of ammonia, nitrate, and nitrite for Aqua were determined using wastewater at the San Luis Obispo Water Resource Recovery Facility (SLO WRRF). Laboratory and field experiments were conducted to test how Aqua compared with natural bacteria for removal of nitrogen compounds. Preliminary data suggested that Aqua performed nitrate removal best in SLO WRRF wastewater at the secondary clarifier. Aqua could perform anoxic and aerobic denitrification in secondary clarifier wastewater. In mineral media, Aqua removed …

Multi-Scale Assembly Methodologies Of Poly(3-Hexylthiophene) Derivative Systems For Enhanced Optoelectronic Anisotropy, David William Bilger

Master's Theses

Conjugated polymers represent a class of semi-conducting materials with numerous applications in optoelectronic devices, including organic light-emitting diodes, field-effect transistors, and photovoltaics. Because of the numerous advantages of macromolecular systems, including solution processing and mechanical flexibility, conjugated polymers have become a burgeoning field of research with the hopes of producing cost-effective solution-based electronics. Importantly, optoelectronic device performance is heavily influenced by conjugated polymer backbone orientation and overall thin film morphology. As such, the processing conditions of these systems are important to the construction of high- performance optoelectronics. Polythiophenes are model conjugated polymers that have been studied extensively in halogenated organic …

Removal Of Nitrates From Stormwater Using Nanoclays, Rubia Siddiqi

Master's Theses

Creeks and rivers are often polluted as a result of stormwater runoff that carries various contaminants in to open water bodies, causing adverse environmental and health effects. Low impact development (LID) techniques are currently employed to treat this runoff prior to discharge. Nitrate, however, is not consistently removed by these LID techniques. This study analyzed the ability of several nanoclays to remove nitrate in runoff and determined the feasibility of using them as a soil supplement for LID implementation. Six different nanoclays and HCl-treated clays were compared (pre-modified trimethyl stearyl ammonium nanoclay, pre-modified dimethyl dialkyl amine nanoclay, unmodified hydrophilic bentonite, …

Austin (22tu549): Mississippian Emergence In The Northern Yazoo Basin, Elizabeth Kay Hunt

Master's Theses

The Austin Site (22TU549) is a known transitional Late Woodland to early Mississippian village located in Tunica County, Mississippi. Compared with the cultural phases that have been developed in other regions the northern Yazoo Basin lacks a clearly defined “Emergent Mississippian” phase. This study examined the ceramic assemblage (n=30,567) from a 25% random sample of pit features to measure transitional change as a way to define an early Mississippian phase. It also explored the ways in which this site experiences the Mississippian transition and how it fits into the larger trajectory of the Mississippian phenomenon in the Southeastern United States …

A Close Encounter With Death: Narration In Markus Zusak's The Book Thief, Erin M. Gipson

Master's Theses

While critics have discussed Markus Zusak’s The Book Thief (2005) in terms of the Holocaust, its generic hybridity, and its crossover readership for child and adult audiences, I offer the first narratological reading of its unusual narrator: Death. This reading focuses on the rhetorical strategies underlying Death’s contradictory narration, which is at once anthropomorphized and constitutively nonhuman. Scholars of The Book Thief often assume the narrator’s omniscience, but I find that Death is crucially not omniscient; rather, he merely performs omniscience to mask his humanlike limitations. Since current terminology falls short of describing Zusak’s narration, I propose the new classification …

Sedimentary Characteristics And Nutrient Sequestration Of Embanked Floodplains Along The Lower Mississippi River, Mississippi And Louisiana, R M Malitha Rathnayake

Master's Theses

The Mississippi River Basin is the largest river basin in North America and the third largest river basin in the world. Most of the corn, soybeans, wheat, cattle, and hogs harvested in the United States come from the Mississippi River Basin and about 58% of the entire drainage basin is croplands. Runoff from these lands carries sediments and nutrients, and the Mississippi River transports these downstream and ultimately deposits them in the Gulf of Mexico. The northern Gulf of Mexico is one of largest human-caused hypoxic zones in the world. Hypoxia is the phenomena where the dissolved oxygen level decreases …

Effects Of A Function-Based Peer Management Intervention With Middle-School Students With Adhd, Kate A. Helbig

Master's Theses

Attention Deficit/Hyperactivity Disorder (ADHD) is characterized by impairment in functioning due to inattention, hyperactivity, or impulsivity, as well as difficulties in school with social rejection and academic underachievement (American Psychiatric Association, 2013). The purpose of this study was to investigate the effectiveness of a peer-mediated non-contingent reinforcement (NCR) intervention informed by functional assessment data to decrease disruptive behavior for students with a special education classification of OHI-ADHD. Participants included three student dyads in a middle school setting located in the Southeastern United States. An A/B/A/B withdrawal design was used to evaluate the effectiveness of this intervention. The primary dependent variables …

Born To Run: A Grounded Theory Study Of Cheating In The Online Speedrunning Community, Christopher G. Brewer

Master's Theses

Video games represent a growing genre of media quickly becoming one of the leading forms of entertainment (Jordan, 2014). This popularity has allowed new playstyles to emerge across the video game genre, such as e-Sports and speedrunning. In particular, the speedrunning community has somewhat redefined what it means to “cheat” in a video game by accepting the use certain software and hardware violations that could be seen as “cheating” to the general gaming community. This paper examined the social construction of cheating in this digital community through the use of grounded theory methods.

Eignefunctions For Partial Differential Equations On Two-Dimensional Domains With Piecewise Constant Coefficients, Abdullah Muheel Momit Aurko

Master's Theses

In this thesis, we develop a highly accurate and efficient algorithm for computing the solution of a partial differential equation defined on a two-dimensional domain with discontinuous coefficients. An example of such a problem is for modeling the diffusion of heat energy in two space dimensions, in the case where the spatial domain represents a medium consisting of two different but homogeneous materials, with periodic boundary conditions.

Since diffusivity changes based on the material, it will be represented using a piecewise constant function, and this results in the formation of a complicated mathematical model. Such a model is impossible to …

The Classroom Password: An Independent Group Contingency Targeting Academic Engagement And Disruptive Behaviors In High School Classrooms, Kayla E. Bates-Brantley

Master's Theses

The classroom password, an independent class-wide group contingency, was implemented in a high school setting in effort to determine its effects on academically engaged behaviors, disruptive behaviors and passively off-task behaviors. This was done using a reversal design across three classes. The focal point of this study was to determine if the classroom password would increase academic engagement. The classroom password was implemented by having the teacher select a word of the day that was then incorporated into the classes lecture. The students were given the word for the day before the lectures began and were required to code each …

For King And Country: Reconsidering The Great War Soldier In Britain, 1914-1945, Nicholas John Schaefer

Master's Theses

In the postwar period historians argued that the horrors of the First World War created an irreparable disconnect between soldiers’ pre and postwar lives. Scholars led by Paul Fussell and Eric Leed presented the Great War as a futile waste of life for a meaningless cause. This historiography argues that the generation which survived the Western Front returned to Britain as jaded shells of their former selves unable to relate to their old lives and families. Bitterness and apathy replaced belief in cause and country. In contrast, recent historiography asserts that British soldiers maintained belief in their country’s cause and …

When We Were Monsters: Ethnogenesis In Medieval Ireland 800-1366, Dawn Adelaide Seymour Klos

Master's Theses

Ethnogenesis, or the process of identity construction occurred in medieval Ireland as a reaction to laws passed by the first centralized government on the island. This thesis tracks ethnogenesis through documents relating to change in language, custom, and law. This argument provides insight into how a new political identity was rendered necessary by the Anglo-Irish. Victor Turner’s model of Communitas structures the argument as each stage of liminality represents a turning point in the process of ethnogenesis.

1169 marked a watershed moment as it began the Anglo-Norman invasion of Ireland. English nobles brought with them ideas of centralized power. In …

The Influence Of Perceived Job Flexibility And Spousal Support On The Marital Satisfaction Of Parents Of Children With Special Needs, Katie M. Perlowski

Master's Theses

Parents of children with special needs can experience more stress in their marriage than parents of children without special needs. Previous work has focused on the child as a major influence for the marital relationship, however this research sought to examine less commonly discussed factors that influence marital satisfaction for these parents. Perceived job flexibility and perceived spousal support in parenting were targeted as potential influencers. A mediation model was attempted to explain the mediating role of perceived spousal support in parenting in the relationship between perceived job flexibility and marital satisfaction. Results showed no correlation between perceived job flexibility …

Solitary And Social Object Play In The Bottlenose Dolphin (Tursiops Truncatus), Briana M. Cappiello

Master's Theses

Many comparative studies have focused on the emergence of solitary and social play in early development. However, few consider observer and parallel forms of solitary play. In this study, use of video analysis revealed that there is a significant difference between the frequency of solitary, observer, parallel, and social object play states, in calf, juvenile, subadult, and adult bottlenose dolphins (Tursiops truncatus). While juveniles engaged in solitary play significantly more than any other age group, both juveniles and calves engaged in observer and social play significantly more than adults and subadults. Within their own age group, calves, juveniles, …

Effects Of Wave Action On The Structure Of Fish Assemblages Across An Exposure Gradient, Lauren Liddon

Master's Theses

Disturbance affects the function and diversity of ecosystems. Increased wave exposure to salt marsh can disturb sediments and cause a loss of habitat. The purpose of this study was to explore the effects of increased wave exposure on diversity, abundance, and functional ecology of estuarine fishes. If increased wave exposure is acting as a disturbance to these habitats, ecological theory (Intermediate Disturbance Hypothesis) predicts that diversity will peak at intermediate frequencies and intensities of disturbance. Fish were sampled from 10 sites monthly for 6 years. The sites were assigned to different exposure categories (Open, Intermediate, and Sheltered) using an exposure …

"To Mississippi, Alone, Can They Look For Assistance:” Confederate Welfare In Mississippi, Lisa Carol Foster

Master's Theses

In 1860, few destitute white citizens lived in Mississippi, and they were supported by their home counties. The Civil War drastically increased county indigent levels due to the high service and casualty rates of Mississippi soldiers. This thesis explores how Mississippi provided for its soldiers and their families during and immediately after the war (1861-1868), through post-war pensions (1888-1992), and through the Beauvoir Jefferson Davis Memorial Soldiers’ Home (1903-1957). This thesis challenges the existing historiography, showing that Mississippi began aiding indigent soldiers and families as early as 1861, and the 1888 pension law operated outside the Lost Cause movement, providing …

Environmentally-Driven Variation In The Population Dynamics Of Gulf Menhaden (Brevoortia Patronus), Grant D. Adams

Master's Theses

Gulf Menhaden (Brevoortia patronus) is an abundant forage fish distributed throughout the Northern Gulf of Mexico (NGOM). Gulf Menhaden support the second largest fishery, by weight, in the United States and represent a key linkage between upper and lower trophic levels. Variation in the population dynamics can, therefore, pose consequences for the ecology and economy in the NGOM. Here we aim to understand variation in the individual and population dynamics of Gulf Menhaden throughout ontogeny and how such variation relates to environmental processes. We utilized a suite of fishery-dependent and –independent, remote sensing, modeled, and in situ data …

Investigating The Potential Of Plant-Derived Antimicrobials And Probiotic Bacteria For Improving The Microbiological Safety Of Dry Pet Food, Chi-Hung Chen

Master's Theses

No abstract provided.

Comparison Of White Spot Lesions Among Clear Aligners, Self-Ligating Brackets And Conventional Brackets - A Randomized Controlled Clinical Trial, Hussin Alshatti

Master's Theses

No abstract provided.

Neurophysiological Characteristics Of Magnetic Seizure Therapy Vs. Electroconvulsive Therapy In Geriatric Patients With Severe Depression, Monica T. Ly

Master's Theses

Objective: Magnetic seizure therapy (MST) is under development as an alternative to electroconvulsive therapy (ECT), as it offers reduction in depression symptoms with fewer adverse cognitive effects. This study examined the feasibility and efficacy of MST versus ECT in a randomized trial of geriatric patients with severe depression, then compared the neurophysiological characteristics of seizures induced by MST or ECT and investigated potential links between seizure expression and therapeutic response.

Method: Six patients (mean age: 64.8) with severe depression were randomized to receive MST (n=3) or ECT (n=3) until maximal antidepressant effect (mean number of sessions: 14.67). Depression symptoms were …

Force And Fatigue Development Following Electrical Stimulation: The Effect Of Frequency And Fiber Type, Maria Vromans

Master's Theses

Functional electrical stimulation (FES) has been used broadly during rehabilitation and sport injuries to expedite tissue and muscle recovery. More recently, attention has been given to the use of electrical stimulation at the cellular level for muscle regeneration. One of the challenges, however, is understanding the optimal FES characteristics to stimulate a muscle without causing fatigue or adverse injury to the muscle. The purpose of this research is to evaluate the effect of different FES frequencies (10, 35, and 50Hz) on the onset of skeletal muscle fatigue, defined by a drop in muscle force. Further, to evaluate the electrical activity …

Two-Implant Supported Maxillary Overdentures: One-Year Assessment Of Patient-Centered Outcomes., Florian R. Kernen

Master's Theses

No abstract provided.

Advantages And Limitations Of Different Resolution Force Fields To Study Membrane Active Peptides, Michael Ward

Master's Theses

No abstract provided.

Microwave Interferometry Diagnostic Applications For Measurements Of Explosives, Loren A. Kline

Master's Theses

Microwave interferometry (MI) is a Doppler based diagnostic tool used to measure the detonation velocity of explosives, which has applications to explosive safety. The geometry used in existing MI experiments is cylindrical explosives pellets layered in a cylindrical case. It is of interest to Lawrence Livermore National Labs to measure additional geometries that may be overmoded, meaning that the geometries propagate higher-order transverse electromagnetic waves. The goal of my project is to measure and analyze the input reflection from a novel structure and to find a good frequency to use in an experiment using this structure. Two methods of determining …

A Comparative Analysis Of The Nutrient Composition And Digestibility Of California Perennial And Annual Grasses At Four Stages Of Growth, Elaina Cromer

Master's Theses

Beef products represent the fourth largest agricultural commodity in the state of California, valuing more than $3 billion from 2013 to 2015 (CDFA, 2016) and procure 90% of the income for the range livestock industry (FRAP, 2003). Forages found on California’s coastal, desert, foothill, and mountain ranges are the basis of the state’s beef cattle industry. Understanding their nutritional quality of these forages is important for their effective use (George et al., 2001a; Waterman et al., 2014). The objectives of this research were to investigate the nutritional characteristics, and in situ digestbilities in Angus beef cattle, of common California annual …

Iota: Internet Of Things Assistant, Brandon M. Okumura

Master's Theses

The Internet of Things is the networking of electronic devices, or “Things”, that enables them to collect and share data, as well as interact with their physical surround- ings. Analyzing this collected data allows us to make smarter economic decisions. These interconnected networks are usually driven by low-powered micro-controllers or cheap CPUs that are designed to function optimally with very little hardware. As scale and computational requirements increase, these micro-controllers are unable to grow without being physically replaced.

This thesis proposes a system, IoTA, that assists the Internet of Things by pro- viding a shared computational resource for endpoint devices. …