Digital Commons Network^™

Effect Of High Cationic Flocculant On Anaerobic Digestion Of Municipal Wastewater., Prathap D. John

Electronic Theses and Dissertations

Anaerobic digestion (AD) of municipal sludge is a widely used stabilization process at municipal wastewater treatment plants. It is highly effective in reducing sludge volume and produces methane gas which is used as fuel in the wastewater plant. Following digestion sludge is sent to a centrifuge to separate the solids from the liquids. Louisville MSD adds flocculent to material in the centrifuge to better coagulate the solids, thereby aiding in separation of the solids from the liquids. The potential for further AD, COD reduction, and methane generation of the liquid effluent from the centrifuge was unknown, particularly in regards to …

Examining The Effects Of Macrophage Populations On Cancerous Tumor Growth., Grace E. Mahlbacher

Electronic Theses and Dissertations

The most abundant immune cell types of the tumor microenvironment macrophages recruited there by tumor-eluted factors. The role of these immune cells in tumor progression, and the interplay between tumor and immune cells is an emerging field of research with potential for novel treatment strategies. Here, a TIE2 expressing macrophage (TEM) subtype is integrated into a virtual tumor model. Within the 2D microenvironment, the TEM will differentiate from an extravasated monocyte precursor, congregate around the abluminal side of the vasculature in response to a chemoattractant gradient, secrete cytokines which favor differentiation of a separate angiogenic macrophage subtype [1]. The effects …

A Novel Mra-Based Framework For The Detection Of Changes In Cerebrovascular Blood Pressure., Yitzhak Atakilt Gebru

Electronic Theses and Dissertations

Background: High blood pressure (HBP) affects 75 million adults and is the primary or contributing cause of mortality in 410,000 adults each year in the United States. Chronic HBP leads to cerebrovascular changes and is a significant contributor for strokes, dementia, and cognitive impairment. Non-invasive measurement of changes in cerebral vasculature and blood pressure (BP) may enable physicians to optimally treat HBP patients. This manuscript describes a method to non-invasively quantify changes in cerebral vasculature and BP using Magnetic Resonance Angiography (MRA) imaging.

Methods: MRA images and BP measurements were obtained from patients (n=15, M=8, F=7, Age= 49.2 …

Civic Pride Or Civic Duty? : An Examination Of Willingness To Support A Professional Sport Stadium Referendum., Alicia M. Cintron

Electronic Theses and Dissertations

Professional sport stadium subsidization is abundant across the United States, where the voting public is sometimes provided the opportunity to approve the measures through referendum. Many of these referendums are approved by the voters (Kellison & Mondello, 2014; Mondello & Anderson, 2004), despite research stating professional sport stadiums bring little to no economic benefit to a municipality (Baade, 1994, 1996; Baade & Dye, 1988a, 1990; Baade et al., 2008; Coates & Humphreys, 1999, 2002; Euchner, 1993; Zipp, 1996). Therefore, the purpose of this study was to understand what factors may influence a constituent’s willingness to support a professional sport stadium …

Intraspecific Differences In Belowground Associations And Seedling Root Morphology For The Biofuel Crop, Panicum Virgatum., Erin Renee Kinnetz

Electronic Theses and Dissertations

The perennial C₄ grass Panicum virgatum (switchgrass) is a promising bioenergy feedstock. Switchgrass is symbiotic with arbuscular mycorrhizal fungi (AMF). I examined 12 varieties of switchgrass grouped into 2 ecotypes (upland, lowland) to see if they differed in AMF abundance and root colonization using the GLBRC Variety Trials experiment. There was higher root colonization of lowland ecotype. A greenhouse experiment evaluated the role of live soil organisms in seedling establishment of 11 varieties. Live soil increased seedling survival, growth and influenced root morphology. Ecotypes differed in root architecture. Lowland developed a higher specific root length (SRL), a trait associated …

The Effect Of Caffeine On Fecundability : Differences In Coffee, Tea, And Cola Consumption., Emily Kathleen Steinmetz

Electronic Theses and Dissertations

This study examined whether intake of caffeinated beverages (coffee, tea, and cola) was associated with fecundability (time to pregnancy) in a prospective cohort study. Data from 470 women from the Mount Sinai Study of Women Office Workers (1990-1994) were analyzed. Intake of coffee, tea, cola, and other variables were recorded in daily diaries and calculated as menstrual cycle level means for up to 20 cycles. Pregnancy was assayed using hCG and confirmed by physician diagnosis. The associations of caffeinated beverages with the probability of becoming pregnant during a given cycle were determined using discrete survival analysis, adjusted for potential confounders. …

The Particulars About Particulates : Metal Exposure And Self-Regulation Of Children Living Near Coal Ash., Clara G. Sears

Electronic Theses and Dissertations

The use of coal combustion for electricity and the storage of coal combustion by-products known as coal ash occur across the United States and around the world. The most abundant type of coal ash, fly ash, contains small particles with metals, some of which are known neurotoxins. Fly ash is currently stored in open-air landfills and surface impoundments that allow fugitive dust to escape into surrounding communities, potentially exposing children to small neurotoxic particles. This dissertation uses preliminary data from a larger cross-sectional study to investigate the relationship between particulate matter exposure, metal exposure, and problems with self-regulation. Recruitment of …

From Damsel In Distress To Active Agent : Female Agency In Children's And Young Adult Fiction., Megan Sarah Mcdonough

Electronic Theses and Dissertations

This dissertation analyzes the different ways in which female characters in children’s and young adult fiction can claim agency. Using adaptation theory, feminist theory, and theories of agency and autonomy, this project examines how portrayals of female protagonists have changed to accept a multiplicity of strong females, and why we need these different kinds of characters within our culture. Working with the definition of agency as the choices one makes and the subsequent actions she takes, this dissertation examines how female characters from paradigm shifting texts claim agency. Each chapter uses a specific feminist lens to explore literary texts and …

Improving Cardiac Cell Therapy: Role Of Hdac1 In Directing Cmc Cell Fate Decisions And Therapeutic Efficacy., John Zhao

Electronic Theses and Dissertations

Cardiac mesenchymal stromal cell (CMC) administration has improved cardiac function in pre-clinical animal models of heart failure. Specifically, both transdifferentiation and secretion of paracrine signaling molecules are potential mechanisms by which transplanted cells exert their cardiac reparative effects. The inhibition of histone deacetylases (HDACs) has been shown to enhance the cardiogenic differentiation capacity of various progenitor cell types. In the current study the consequences of HDAC1 inhibition on CMC in vitro differentiation, in vivo cardiac reparative capabilities, and in vitro cytokine secretion were investigated using either genetic depletion of HDAC1 or pharmacological inhibition with entinostat. CMCs depleted of HDAC1 exhibit …

Application Of Symplectic Integration On A Dynamical System, William Frazier

Electronic Theses and Dissertations

Molecular Dynamics (MD) is the numerical simulation of a large system of interacting molecules, and one of the key components of a MD simulation is the numerical estimation of the solutions to a system of nonlinear differential equations. Such systems are very sensitive to discretization and round-off error, and correspondingly, standard techniques such as Runge-Kutta methods can lead to poor results. However, MD systems are conservative, which means that we can use Hamiltonian mechanics and symplectic transformations (also known as canonical transformations) in analyzing and approximating solutions. This is standard in MD applications, leading to numerical techniques known as symplectic …

Characterization Of A Mutant Oncolytic Adenovirus And The Role Of Jnk In Enhancing Virotherapy., Stephen L. Wechman

Electronic Theses and Dissertations

Oncolytic adenoviruses (Ads) have great therapeutic potential for lung cancer treatment. Cancer selective E1b-deleted Ads are safe; however, their clinical cancer therapeutic efficacy remains limited. The limited efficacy of Ad virotherapy is due to many factors including inefficient cancer cell lysis, Ad release and spread. Progress in overcoming these barriers to Ad virotherapy are hampered by limited knowledge of the genes associated with enhanced Ad release and spread and the dearth of understanding of the mechanisms by which E1b-deleted Ads cause cancer cell lysis. The role of c-JNK n- terminal kinase (JNK) phosphorylation in this process remains unknown. …

New Genres And New Challenges : Five Interdisciplinary Case Studies Of Master's Student Writers., Meghan Lynne Hancock

Electronic Theses and Dissertations

In the area of graduate writing research, Rhetoric and Composition scholarship has focused mainly on students of English and their experiences as novice writing teachers, or on students who are nearing the end of their graduate experience and are in the writing stage of their culminating projects, like dissertations. Few case studies in Rhetoric and Composition have been conducted on graduate student writers, particularly graduate students from multiple disciplines. This dissertation sets out to address this gap in conducting five interdisciplinary case studies of new master’s student writers as they navigate their first semester of graduate school and learn how …

Synthesis And Fundamental Property Studies Of Energy Material Under High Pressure., Meysam Akhtar

Electronic Theses and Dissertations

Recently, high-pressure science and technology has flourished and rapidly advanced to impact a wide domain of materials and physical sciences. One of the most substantial technological developments is the integration of samples at ultrahigh pressure with a wide range of in-situ probing techniques. Applications of extreme pressure have significantly enriched our understanding of the electronic, phonon, and doping effects on the newly emerged two-dimensional (2D) materials. Under high pressure, materials’ atomic volume radically decreases, and electronic density rises, which will lead to extraordinary chemical reaction kinetic and mechanisms. The promising capability of high pressure combine with the significance of novel …

Deceptions., Travis Huff

Electronic Theses and Dissertations

Acceptance: “Happiness can only happen in cceptance” –George Orwell Sanity: “Sanity and happiness are an impossible combination.” –Mark Twain Amends: “If you have behaved badly, repent, make what amends you can and address yourself to the task of behaving better next time.” – Aldous Huxley

Neural Coding Of Natural And Synthetic Speech., Allison Brown

Electronic Theses and Dissertations

The present study examined whether natural and synthetic speech are differentially encoded in the auditory cortex. Auditory event-related potential (ERP) waveforms were elicited by natural and synthetic fricative-vowel stimuli (/sɑ/ and /ʃɑ/) in a passive listening paradigm in adult listeners with normal hearing. ERP response components were compared across conditions. The results indicated that peak latencies to natural speech were significantly earlier than those to synthetic speech. Natural speech also produced significant electrode hemisphere site effects, whereas synthetic speech activated left, midline, and right electrode hemisphere sites equally. Overall, the results suggest that cortical processing of natural and synthetic speech …

Stigma Of Mental Illness And Multicultural Counseling Self-Efficacy : Investigating The Implications Of The Multicultural Training Environment, Mental Health Literacy, And Empathy., Sarah E. Tucker

Electronic Theses and Dissertations

Research has shown that the stigma of mental illness is a pervasive social issue, in the United States and globally (Arboleda-Florez, 2008), one that has been considered by the surgeon general to be one of the single greatest barriers to addressing mental health care in the United States (U.S. Department of Health and Human Services, 1999). Furthermore, research has indicated that mental health care providers hold stigmatizing views toward people with mental illnesses at rates equal to or higher than the general public (Nordt, Rössler, & Lauber, 2006). This experience of being stigmatized because of a mental illness diagnosis by …

Novel Iii-V Alloys For Unassisted Water Splitting., Alejandro Martinez-Garcia

Electronic Theses and Dissertations

Direct conversion of solar energy to fuels by photoelectrochemical (PEC) water splitting has been identified as a promising route for sustainable power generation and storage. However, semiconductor materials with suitable opto-electronic properties have yet to be identified. In this dissertation, band gap engineering of III-V alloys, tuning the light sensitivity of GaP and GaN nitride through alloying Sb, is investigated for developing new semiconductor alloys with appropriate opto-electronic properties and their performance with overall water photoelectrolysis. In addition to III-V materials, copper oxide (Cu₂O) electrode was investigated for p-type semiconductor material. The new III-V alloy anodes were studied …

Environmental Factors, Not Plants, Contribute To Functional Diversity Of Soil Bacteria In The Dunes Of Lake Michigan., Andrea Stark Howes

Electronic Theses and Dissertations

Soil bacteria play important roles in nutrient cycling and other ecosystem functions, and many biotic and abiotic factors can influence bacterial functional diversity. The goal of this field study was to examine differences among bacterial communities in sand dunes of Lake Michigan. I used Biolog Ecoplates™ to compare bacteria functional diversity associated with four different plant species: the native dune-building grass Ammophila breviligulata, invasive species Leymus arenarius and Gypsophila paniculata, and native legume Lathyrus japonicus across 13 sites in Michigan, representing a gradient in abiotic factors such as precipitation and temperature. I found no differences in bacterial function associated with …

Instructional Teacher Job Resources And Student Achievement In Mathematics., Amy Stokes-Levine

Electronic Theses and Dissertations

Research shows that teachers who are supported with job resources are more engaged regardless of the level of demands (Klusmann et al., 2008). Additionally, teachers who are engaged with their work are less likely to report their intention to leave the teaching profession (Klassen et al., 2012), which is particularly important for mathematics teachers who are in high demand (Sutcher, Darling-Hammond, & Carver-Thomas, 2016). Supporting employees with job resources is a commonly accepted practice in many professional fields (e.g., Christian, Garza, & Slaughter, 2011), yet is not a common practice in education (e.g., Bidwell, 2013; Gewertz, 2014; Layton, 2015; Rentner …

Developing Computer Vision Technology To Automate Pitch Analysis In Baseball., Mahdi Moalla

Electronic Theses and Dissertations

Lokator is a baseball training system designed to document pitch location while teaching pitch command, selection and sequencing. It is composed of a pitching target and a smartphone app. The target is divided into a set of zones to identify the pitch location. The main limitation of the current system is its reliance on the user's feedback. After each throw, the pitcher or the coach needs to identify and report the target's zone that was hit by the ball by just relying on the naked eye. The purpose of this thesis is to investigate the possibility of using computer vision …

Horizon Cross : A Parafictional History Through Photographs., Tom Legoff

Electronic Theses and Dissertations

Horizon Cross: A Parafictional History Through Photographs is a body of work that dwells within the intersection between truth and fiction in photography. It is informed by the history of hoax photographs and my fascination with the Large Hadron Collider in Switzerland and black holes, the space-time boundary of which is known as an event horizon. I have imagined into being a community in northern Ontario Province, equipped with the technology of the mid-nineteenth century but also with concepts far ahead of their time. To portray the inhabitants of Horizon Cross I have created photographic portraits of fictional people that …

Performance Analysis Of Organizations As Complex Systems., William C. Harrington Jr.

Electronic Theses and Dissertations

This dissertation provides a method for evaluating the difference in performance after an organization makes a change while considering the stochastic nature in which it operates. A procedure that uses simulation to estimate outcomes by adjusting controllable parameters and leaving uncontrolled parameters unadjusted is proposed. As healthcare organizations are considered as highly complex systems, a case study involving a scheduling tactic change in the mother-baby service line of a hospital is used to demonstrate application of this procedure. The goal in the case study was to reduce delays in transitioning care of mother patients from the labor and delivery unit …

The Implications Of A University Of Louisville First Year Experience Course On Student Success Outcomes Based On Race And Gender., Nadine C. Petty

Electronic Theses and Dissertations

Extant research has shown that across U.S. institutions, the first and second years of college are the most precarious because of high attrition rates. To address this, many colleges and universities implement First Year Experience (FYE) interventions with hopes of increasing first year GPA, retention rates, and overall college success. Over 90% of colleges and universities either offer or make these FYE interventions mandatory for their first-year/first-time freshmen. There is a large body of research regarding the association of FYE interventions and student outcomes, but the findings are mixed. Extant literature also does little to focus on FYE student outcomes …

Thomas Merton : Evil, Suffering, Zen And The Purified Soul Theodicy., David Edward Orberson

Electronic Theses and Dissertations

Thomas Merton was one of the most important Catholic writers of the 20th century. Hundreds of scholarly books and articles have been written about various facets of his life and work. However, one area of personal interest that has not been adequately addressed in Merton’s work is the theodicy question. Merton never wrote a book or even an article dedicated to the problem of evil. In this project, I examine Thomas Merton’s work to determine if he espoused any kind of theodicy. More specifically, I review Merton’s entire canon, i.e., books, journals, correspondence, articles and talks he gave to novice …

Mercury Concentrations In Snowy Plovers And Sediments Of Their Breeding Environments In The Southern Great Plains, Laura Duffie

Electronic Theses and Dissertations

Western snowy plovers (Charadrius nivosus) are philopatric shorebirds sporadically distributed during the breeding season at saline lake and alkali flat breeding environments of the Southern Great Plains (SGP) of Oklahoma, New Mexico, and Texas. The major conservation threat to interior snowy plovers breeding on the SGP derives from anthropogenic modification of breeding environments. The SGP is one of the most intensively cultivated regions in the world, and excessive groundwater mining and resulting deterioration of artesian spring flows reduces site quantity and quality critical for regional successful nesting. Most saline lakes now primarily receive freshwater inputs via irregular precipitation …

Everything Is A Box, Javier F. Vega

Electronic Theses and Dissertations

Everything is a Box is a body of work composed of media sculptures that thematically explore how my exposure to mass media in the form of television, film, video games and technology influence my studio practice. Everything is a Box presents the audience with works made through the lens of an artist raised in the United States during the late 1990s.

Assessment And Characterization Of Microbial Communities In Salt Affected Soils On Galveston Island, Elaine Fowler

Electronic Theses and Dissertations

After Hurricane Ike in 2008, Galveston Island was flooded with sea water that left the soil and groundwater of the island with elevated sodium concentrations. As part of a long-term study that aims to restore plant life to the island, various soil amelioration techniques are being evaluated. Samples from bedded and non- bedded plots treated with gypsum, mulch, or both were assessed for microbial populations. Samples collected in July and October 2016 were cultured on Tryptic Soy Agar (bacteria enumeration), Pseudomonas Agar, Actinomycete Agar, and Rose Bengal Agar (fungi enumeration). Bacteria populations ranged from 4.07 to 5.12 log CFU/gram and …

Airiños: For Orchestra And Two-Part Women's Choir, And A Biography Of The Poet Rosalía De Castro, Scott T. Stobbe

Electronic Theses and Dissertations

ABSTRACT

Spanish poet Rosalía de Castro was a central figure in the Galician

cultural and literary revival of the mid nineteenth-century. One of her most

significant books is Cantares Gallegos, a book of poems written in Galician that

serves as an homage to the language, culture, customs and countryside of

Galicia. The text for the musical portion of this document, a work for orchestra

with extended percussion and two-part women’s choir entitled Airiños, comes

from Castro’s poem Airiños, airiños, aires which was featured in Cantares

Gallegos. To gain a deeper understanding of the author’s importance and

influence in Galicia and …

Observations On Convexity, Chad A. Huckaby

Electronic Theses and Dissertations

This thesis will explore convexity as it pertains to sets of complex-valued functions. These include preliminary looks at established linear and polynomially convex hulls, along with the development of new types of convex hulls. These types will include, but are not limited to the hulls determined by inversions, shift inversions, and Mobius transformations. A convex hull must be preceded by the set of functions involved. These hulls are the smallest convex sets that contain the original set. Justifications and precise definitions are included within the body of the work.

Basement And Cover Structural Analysis Along The Eagle River Gorge, Sawatch Range, Colorado, Kaitlin Lee Askelson

Electronic Theses and Dissertations

The Sawatch Range within the Rocky Mountains of central Colorado exposes Paleoproterozoic basement and overlying Paleozoic sedimentary rocks with a complex history of ductile and brittle deformation.

The goal of this study is to conduct analyses of brittle structures that occur in the basement and cover units to determine geometric relationships between the structures, provide a detailed description of structures and refine a geologic history for structures along the basement-cover contact in the northeastern Sawatch Range along the Eagle River canyon and U.S. Highway 24 from Red Cliff to Gilman, Colorado. Paleoproterozoic basement rocks include the Cross Creek granite, diorites, …