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Graduate Theses and Dissertations

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Screening A Set Of Tomato Genotypes For Resistance To Bacterial Wilt And A Genomic Wide Association Study And Genomic Prediction For Yield-Related Traits In ‘Lcp 85-384’. I. Sugarcane, Theresa Makawa Phiri Aug 2023

Screening A Set Of Tomato Genotypes For Resistance To Bacterial Wilt And A Genomic Wide Association Study And Genomic Prediction For Yield-Related Traits In ‘Lcp 85-384’. I. Sugarcane, Theresa Makawa Phiri

Graduate Theses and Dissertations

This thesis comprises two studies that focused on screening tomato genotypes for bacterial wilt resistance and a genome-wide association study and genomic prediction for yield-related traits in sugarcane with the aim of contributing to the breeding programs. In the first chapter, 40 tomato accessions from the USDA collection were evaluated for their resistance to Ralstonia solanacearum isolate P822 under controlled greenhouse conditions. The plants were inoculated, and disease symptoms were visually assessed. Disease severity was rated on a scale of 0 to 4, where 0 represented no wilting and 4 indicated complete leaf wilting. Among the tested accessions, five (PI …

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The Future Of Public And Private Plant Breeding According To Plant Scientists, Lexie Burris Aug 2023

The Future Of Public And Private Plant Breeding According To Plant Scientists, Lexie Burris

Graduate Theses and Dissertations

Plant breeding has been effective in addressing food insecurity by increasing agricultural yields and productivity. Historically, public plant breeding programs have long-term, integrated approaches to plant breeding research, germplasm enhancement, and variety development, but as funding is reduced the future is less certain as to areas of focus. This survey builds off those before it and asks the next logical question, if a divergence between private and public breeding is taking place, what aspects should each sector focus on? The impetus of this study was to ask opinions of plant breeders globally regarding the direction they believe the public and …

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Factors Affecting Food Security And Participation In Food Pantries In The U.S., Alexis Jade Skinner Aug 2023

Factors Affecting Food Security And Participation In Food Pantries In The U.S., Alexis Jade Skinner

Graduate Theses and Dissertations

Given the rise in food inflation, reduction of SNAP benefits, and the increased demand for food pantry participation, a more holistic understanding of potential barriers to obtaining assistance from non-Federally regulated food pantries is warranted. In May of 2022, 625 surveys were administered to low-income participants in the United States who participated in food collection from a food pantry in the previous month. Those participants were asked to select what information they were asked to provide during their visit, including home address, place of employment, Social Security card, driver’s license, household size, blood test, or others. Some forms of the …

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How Systematically Increasing Estimator Variables Affects The Confidence-Accuracy Relationship, Amber M. Giacona Aug 2023

How Systematically Increasing Estimator Variables Affects The Confidence-Accuracy Relationship, Amber M. Giacona

Graduate Theses and Dissertations

Researchers have used signal-detection theory-based approach to show that when police use proper practices with eyewitnesses, highly confident witnesses will be highly accurate even when viewing conditions may be suboptimal (Wixted & Wells, 2017). This is referred to as the pristine conditions hypothesis. There have been multiple, and often contradictory, studies that have investigated the relationship between viewing conditions and memory degradation (Giacona et al., 2021; Grabman et al., 2019; Lockamyeir et al, 2020; Semmler et al., 2018). In the current study, I systematically manipulated five estimator variables (lighting, distance, retention interval, exposure duration, and race) as either suboptimal or …

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Consumer Valuation Of Rice Quality In Colombia, Juliann Phillips Aug 2023

Consumer Valuation Of Rice Quality In Colombia, Juliann Phillips

Graduate Theses and Dissertations

Rice is a crucial contributor to global food security and is an important staple for over half the world’s population. In Colombia, total rice consumption has grown by 25% in the last decade (2011-2021), reaching 1.9 MMT in 2021, yet in 2021 around 15.5 million Colombians were classified as food insecure. Colombia is the third largest rice producer in Latin America, producing 1.8 million metric tons (milled basis) in 2021. Increasing rice consumption coupled with high levels of food insecurity highlights the necessity that rice markets effectively price rice according to consumer preferences. Therefore, the goal of this study focuses …

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Social And Economic Changes In A Mid-Size University City: The Case Of South Fayetteville, Arkansas, Korab Vranovci Aug 2023

Social And Economic Changes In A Mid-Size University City: The Case Of South Fayetteville, Arkansas, Korab Vranovci

Graduate Theses and Dissertations

The constant growth of the city of Fayetteville is attributed to regional economic growth and an increase in student enrollment, to name a few. As a middle-sized college city, Fayetteville is an anchor city with the University of Arkansas as its anchor institution. These changes have caused a significant increase in the city's urban development and neighborhood changes. This research identifies three areas of work with the potential to assist in the study of the urban redevelopment in the South Fayetteville neighborhoods: (1) the social demographics, economic, and land use changes in neighborhood populations, (2) the stakeholder's perceptions toward city …

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The Roles Of Estrogen Receptor Alpha-Interacting Rnas And Exosomes In Breast Cancer, And E-Cadherin In Carcinomas, Brihget Catalina Sicairos-Meza Aug 2023

The Roles Of Estrogen Receptor Alpha-Interacting Rnas And Exosomes In Breast Cancer, And E-Cadherin In Carcinomas, Brihget Catalina Sicairos-Meza

Graduate Theses and Dissertations

Carcinomas are malignancies of epithelial cells and account for >80% of cancer-related deaths. Approximately 75% of breast cancers express estrogen receptor alpha (ERα). ERα promotes breast cancer progression by enhancing cancer cell proliferation. Tamoxifen is commonly used to treat ERα-positive breast cancers but can result in endocrine therapy resistance. The mechanisms underlying endocrine therapy resistance remain elusive. The Du lab recently found that ERα is an RNA-binding protein. However, the significance of the ERα-RNA interaction is unknown. We fractionated ERα-positive MCF7 cells into cytoplasmic and nuclear fractions, followed by immunoprecipitation of ERα with associated RNAs and RNA-sequencing. We identified many …

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Liquid Crystalline Coacervates Composed Of Chromonic Mesogens And Polyelectrolytes, Elizabeth Adeogun Aug 2023

Liquid Crystalline Coacervates Composed Of Chromonic Mesogens And Polyelectrolytes, Elizabeth Adeogun

Graduate Theses and Dissertations

Complex coacervates are formed by liquid-liquid phase separation of an aqueous solution of oppositely charged ions. Although several mixtures of molecules of natural and synthetic macro-ion have been shown to form complex coacervates, the formation of liquid crystalline (LC) coacervates are sparsely reported. LC coacervates have a unique property in that they can change their shape and optical property in response to external stimuli such as changes in temperature, pH, or the presence of specific molecules. This property makes LC coacervates useful as a sensor, as they can be engineered to respond to specific stimuli and generate a measurable signal …

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Evaluation Of Heat Stress And Dietary Amino Acid Density On Nutrient And Energy Partitioning In Broilers, Jean-Remi Teyssier Aug 2023

Evaluation Of Heat Stress And Dietary Amino Acid Density On Nutrient And Energy Partitioning In Broilers, Jean-Remi Teyssier

Graduate Theses and Dissertations

The simultaneous increase in the global demand for animal-based protein products and the rise in temperature associated with global warming pose important challenges to the poultry industry. Heat stress (HS) occurs when an animal’s heat production (HP) surpasses its capacity to dissipate heat into the surrounding environment, ultimately leading to reduced feed intake (FI) and negative impacts on performance. A better understanding of bird responses to elevated temperatures is required to propose effective nutritional strategies that mitigate the adverse effects of HS. Therefore, this dissertation aimed to characterize the nutritional and physiological mechanisms explaining the loss in performance and carcass …

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Understanding Peripheral Blood Pressure Signals: A Statistical Learning Approach, Md Abul Hayat Aug 2023

Understanding Peripheral Blood Pressure Signals: A Statistical Learning Approach, Md Abul Hayat

Graduate Theses and Dissertations

Proper estimation of body fluid status for human or animal subjects has always been a challenging problem. Accurate and timely estimate of body fluid can prevent life threatening conditions under trauma and severe dehydration. The main objective of this research is the estimation, classification and detection of dehydration in human and animal subjects using peripheral blood pressure (PBP) signals. Peripheral venous pressure (PVP) and peripheral arterial pressure (PAP) signals have been investigated in this research. Both PVP and PAP signals are PBP signals. A dataset of PVP signals was collected using standard peripheral intravenous catheters from human subjects suffering from …

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Poly(Ionic Liquid)S For Magnetic, Ionic, And Electrical Stimuli-Responsive Applications, Kayla Ann Foley Aug 2023

Poly(Ionic Liquid)S For Magnetic, Ionic, And Electrical Stimuli-Responsive Applications, Kayla Ann Foley

Graduate Theses and Dissertations

Poly(ionic liquid)s (PILs) are a fascinating subclass of strong polyelectrolytes formed from polymerizable ionic liquids. As a result of their unique properties and counterion exchangeability, PILs can exhibit conformation structure or material property changes in response to external stimuli such as changes in pH/ionic environment, magnetic fields, and electric potentials. In Chapter 1, a comprehensive review of PILs design as well as their stimuli-responsive behavior is provided. Additional motivation for each dissertation chapter is also discussed. In Chapter 2, magnetically responsive PILs (MPILs) are developed from complexing paramagnetic salts with a random PIL copolymer containing a metal-coordinating co-monomer, acrylamide. A …

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A Pilot Study Of Students’ Ethical Decision Making And Emotional Intelligence, Casandra K. Cox Aug 2023

A Pilot Study Of Students’ Ethical Decision Making And Emotional Intelligence, Casandra K. Cox

Graduate Theses and Dissertations

Demand for ethical leaders in agriculture is high to meet 21st century goals, while ethics course offerings in land-grant institutions are limited. The purpose of this case study was to establish a baseline of current University of Arkansas Bumpers College of Agriculture, Food and Life Science (Bumpers College) agriculture and natural resource program students’ ethical decision making (EDM), as measured by the DIT-2, and emotional intelligence (EI), as measured by STEM-B and STEU-B, determine if EI mean scores predict EDM, and identify relationships between EDM or EI and demographic characteristics or lifespan experiences. An online survey design with probability sampling …

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Considering Contextual Factors In The Perception And Attribution Of Racial Microaggressions, Roselee Ledesma Aug 2023

Considering Contextual Factors In The Perception And Attribution Of Racial Microaggressions, Roselee Ledesma

Graduate Theses and Dissertations

Black, Indigenous, People of Color (BIPOC) experience interactions with subtle or ambiguous racial undertones that may be perceived as discriminatory, benign, or even complimentary. These interactions have been labeled microaggressions or a subtle form of everyday discrimination. Microaggressions are associated with detrimental health and cognitive effects (Lui & Quezada, 2019; Ozier et al., 2019). To better understand and label microaggressions, it is important to consider contextual factors. For example, the same statement or behavior is likely interpreted differently depending on who is involved, what is said or done, when it occurs, where it takes place, and why the statement or …

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Spatial Layout At Isgrig: A Menard Complex Site In The Lower Arkansas River Valley, Noelle King Aug 2023

Spatial Layout At Isgrig: A Menard Complex Site In The Lower Arkansas River Valley, Noelle King

Graduate Theses and Dissertations

Late Mississippian sites in the Lower Arkansas River Valley, or Menard Complex sites, are not well understood especially as they relate to the larger question of Mississippian response to colonial contact. In this thesis, I will explore how the Menard Complex manifests at Isgrig (3PU0015), a site located on the Arkansas River south of Little Rock. I will examine the spatial layout of the site and use ceramic analysis to understand if the site changed significantly over time. Finally, I will compare Isgrig with other Menard Sites in the Lower Arkansas Valley to understand regional trends in site function during …

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Statewide Implementation Of Child-Adult Relationship Enhancement (Care) In Early Childhood Educational Centers: Examination Of Implementation Determinants, Kathryn Parisi Aug 2023

Statewide Implementation Of Child-Adult Relationship Enhancement (Care) In Early Childhood Educational Centers: Examination Of Implementation Determinants, Kathryn Parisi

Graduate Theses and Dissertations

To expand reach of evidence-based strategies for the treatment and prevention of childhood mental health issues, implementation efforts have been focused on educational settings. However, little is known about what facilitates the success of these programs. Implementation determinants provide insight about processes impacting success at the administrative and individual provider level. The current investigation examined data collected from a statewide implementation of Child-Adult Relationship Enhancement (CARE) in early childhood education centers and preschools. Two-hundred, seventeen teachers from 10 early childhood centers and preschools provided ratings of their students’ behavior for several weeks before and after participating in CARE training. Participants …

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Sharing Economy Last Mile Delivery: Three Essays Addressing Operational Challenges, Customer Expectations, And Supply Uncertainty, Nicolò Masorgo Aug 2023

Sharing Economy Last Mile Delivery: Three Essays Addressing Operational Challenges, Customer Expectations, And Supply Uncertainty, Nicolò Masorgo

Graduate Theses and Dissertations

Last mile delivery has become a critical competitive dimension facing retail supply chains. At the same time, the emergence of sharing economy platforms has introduced unique operational challenges and benefits that enable and inhibit retailers’ last mile delivery goals. This dissertation investigates key challenges faced by crowdshipping platforms used in last mile delivery related to crowdsourced delivery drivers, driver-customer interaction, and customer expectations. We investigate the research questions of this dissertation through a multi-method design approach, complementing a rich archival dataset comprised of several million orders retrieved from a Fortune 100 retail crowdshipping platform, with scenario-based experiments. Specifically, the first …

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The Effect Of Sleep Deprivation On The Ability To Reappraise Negative Situations, Rebecca Campbell Aug 2023

The Effect Of Sleep Deprivation On The Ability To Reappraise Negative Situations, Rebecca Campbell

Graduate Theses and Dissertations

Sleep and emotion regulation are important components of mental health and may function interdependently in the development and maintenance of mental health disorders. Unfortunately, there is limited experimental work on the impacts of sleep deprivation on reappraisal, a common emotion regulation strategy, in adults. Furthermore, increases in negative and decreases in positive affect are often associated with sleep loss. This study aimed to examine the relation between sleep deprivation and emotion regulation by asking adults to reappraise a series of vignettes before and after a randomly assigned night of sleep deprivation or normal sleep. Additionally, measures of self-reported emotion regulation …

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Chip- And System-Level Reliability On Sic-Based Power Modules, Pengyu Lai Aug 2023

Chip- And System-Level Reliability On Sic-Based Power Modules, Pengyu Lai

Graduate Theses and Dissertations

The blocking voltage, switching frequency and temperature tolerance of power devices have been greatly improved due to the revolution of wide bandgap (WBG) materials, such as silicon carbide (SiC) and gallium nitride (GaN). Owing to the development of SiC-based power devices, the power rating, operating voltage, and power density of power modules have been significantly improved. However, the reliability of SiC-based power modules has not been fully explored yet. Thus, this dissertation focuses on the chip- and system-level reliability on SiC-based power modules. For chip-level reliability, this work focuses on on-chip SiC ESD protection devices for SiC-based integrated circuits (ICs). …

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Non-Physical Abuse In Sports: Organizational Culture’S Role, Ian O'Rourke Aug 2023

Non-Physical Abuse In Sports: Organizational Culture’S Role, Ian O'Rourke

Graduate Theses and Dissertations

The purpose of this study was to explore the perceptions of sport professionals who worked in organizations that tolerated non-physical abuse. This qualitative study used active interviewing and grounded-theory design to guide the data collection and coding efforts. The data identified emerging themes to generate essential theory. The research collected data through interviews with 10 sport professionals. This phenomenological study looked at sport professionals’ experiences who worked at private sport organizations and those that worked within a university athletic department. Interview responses illustrated that all participants experienced comparable treatment and felt similarly to the non-physical abuse taking place. An interesting …

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Seeking And Providing Social Support In Online Forums For Individuals Experiencing Depression, Anna Gentry Aug 2023

Seeking And Providing Social Support In Online Forums For Individuals Experiencing Depression, Anna Gentry

Graduate Theses and Dissertations

This thesis project investigates how individuals suffering from depression seek support, provide support, and describe experiences of stigma in an online support platform. A phronetic-iterative and constant comparative approach guided an in-depth analysis of 37 posts on a discussion board designed for individuals with depression. The findings demonstrated that individuals use online discussion forums to request support both implicitly and explicitly. In response to sought support, individuals provided informational, emotional, and network support. Finally, discussion board participants discussed social and self stigma. Despite the limitations of the study, the findings indicate the utility of online social support platforms for individuals …

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Understanding The Environmental And Genetic Influence On Fluctuating Asymmetry And Developmental Instability In Primates, Ashly N. Romero Aug 2023

Understanding The Environmental And Genetic Influence On Fluctuating Asymmetry And Developmental Instability In Primates, Ashly N. Romero

Graduate Theses and Dissertations

This dissertation explored the impact of environmental factors on the development and perpetuation of fluctuating asymmetry (FA) and sought to understand the role evolution may play in the FA exhibited in two primate populations: the free-ranging Cayo Santiago rhesus macaques (Macaca mulatta) and the Southwest National Primate Research Center olive baboons (Papio hamadryas anubis). Demographic, ontogenetic, secular, external, and genetic factors were examined. Specifically, this dissertation investigated FA over all ontogenetic stages, across decades, between sexes, in association with ecological catastrophes, and with tooth pathology to try and tease apart factors that may influence FA and developmental instability. This dissertation …

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Risk-Returns Of Forward Contracting Southern Row Crops With Crop Revenue Insurance, Chandan Bhattarai Aug 2023

Risk-Returns Of Forward Contracting Southern Row Crops With Crop Revenue Insurance, Chandan Bhattarai

Graduate Theses and Dissertations

This study evaluated the risk and return associated with various levels of forward contracting for southern row crops, specifically corn, soybean, and rice, in conjunction with different coverage levels of the Revenue Protection (RP) crop insurance program and government support plans. Forward contracting is a strategy to manage price risk by transferring ownership of physical grain from a seller to a buyer at a pre-agreed time. RP is a return-based crop insurance program offering coverage levels ranging from 50-85 percent in 5 percent increments, which allows producers to hedge against yield or price risks. Additionally, the study analyzed the effectiveness …

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Functional Morphology Of The Platyrrhine Humerus And Talus: Implications For Inferring Locomotor Behavior In Extinct Primates, Liam Michael Zachary Aug 2023

Functional Morphology Of The Platyrrhine Humerus And Talus: Implications For Inferring Locomotor Behavior In Extinct Primates, Liam Michael Zachary

Graduate Theses and Dissertations

Platyrrhines are a diverse radiation of primates that exhibit a range of locomotor adaptations. The relationships between extant primate locomotor behavior and variation in postcranial morphology are often used to make functional interpretations of skeletal anatomy in extinct primates. However, a comparative baseline of form-function relationships in the extant platyrrhine postcranium is lacking compared to other primates, which limits understanding of platyrrhine locomotor evolution. The humerus and talus are two of the best represented skeletal elements in the platyrrhine fossil record and are informative of locomotor behavior. Therefore, quantification of morphological variation in extant platyrrhine tali and humeri can provide …

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A Phenomenographic Analysis Of Elementary Student Teachers’ Reflections Using Tiktok As A Resource For Classroom Management, Stefanie Lynn Mckoy Aug 2023

A Phenomenographic Analysis Of Elementary Student Teachers’ Reflections Using Tiktok As A Resource For Classroom Management, Stefanie Lynn Mckoy

Graduate Theses and Dissertations

This phenomenographic study investigates how student teachers use TikTok to discover, analyze, evaluate, and adopt classroom management information and strategies. Student teachers often struggle with classroom management regarding student behavior, classroom environment, and instruction. To address these concerns, they turn to traditional print, digital, and human resources. Fifteen student teachers during the 2022-2023 school year were interviewed using a semi-structured guide. Transcripts were analyzed following a second order approach whereas the research examines student teachers’ perceptions. Four themes, resource discovery, TikTok analysis, evaluating credibility, and strategy adoption. Findings support the need for teacher preparation programs to incorporate exemplar examples of …

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Use Of Microorganisms For The Enrichment Of Zn And Se By Using Solid-State Fermentation, Rashmi Rangaswamaiah Aug 2023

Use Of Microorganisms For The Enrichment Of Zn And Se By Using Solid-State Fermentation, Rashmi Rangaswamaiah

Graduate Theses and Dissertations

Zinc (Zn) and selenium (Se) are essential minerals for human health and naturally found in many food sources. However, the risk of Zn and Se deficiency has been recognized in several countries. As most people throughout the world consume rice, grains, and cereals as staple foods in their daily diet, which contain a certain amount of phytic acid (antinutrients), the phytic acid content inhibits mineral absorption (Zn and Se) by the human body. Moreover, the low levels of Zn and Se content found in the crop's soil also reduce the amount of minerals in the food sources. Therefore, it is …

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Molecular Characterization Of Compartment Boundary Formation During Epithelial Remodeling In Drosophila Melanogaster, Samia Parveen Aug 2023

Molecular Characterization Of Compartment Boundary Formation During Epithelial Remodeling In Drosophila Melanogaster, Samia Parveen

Graduate Theses and Dissertations

The ability of epithelial cells to self-organize is crucial for the development of proper tissue structures and organs in multi-cellular organisms. Epithelia consist of inter-connected cells that form flat sheets, and specific groups of cells within these sheets are partitioned into distinct compartments via compartment boundaries (CBs). These CBs are specialized interfaces between cells characterized by stable, high-tension actomyosin cables, which act as fences to prevent movements between adjacent compartments during tissue reorganization. In the early Drosophila embryo, CBs are established in response to the asymmetrical localization of two cell-surface proteins the Leucine-Rich Repeat (LRR) protein Tartan and the Teneurin …

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Characterizing Logistics Operations Within A Federal Staging Area For Hurricane Response: A Qualitative Analysis Of Federal, State And Local Perspectives, Jannatul Shefa Aug 2023

Characterizing Logistics Operations Within A Federal Staging Area For Hurricane Response: A Qualitative Analysis Of Federal, State And Local Perspectives, Jannatul Shefa

Graduate Theses and Dissertations

A successful deployment of logistics operations following a disaster is a collective contribution of federal, state, and local entities to ascertain an efficient and effective response. This research analyzes data from interviews with disaster response logistics experts from these entities. The objective is to investigate the information sources and planning processes used in these organizations to plan vehicle routes for critical resource deliveries to impacted areas. Special attention is directed to the impacts of incomplete knowledge of infrastructure status, such as road disruptions due to debris or flooding. Supported by both qualitative and quantitative evidence, the study finds that incomplete …

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Comparing Predictive Performance Of Garch And Stochastic Volatility Models, Swapnaneel Nath Aug 2023

Comparing Predictive Performance Of Garch And Stochastic Volatility Models, Swapnaneel Nath

Graduate Theses and Dissertations

This paper compares the predictive performance of two commonly used financial models, the Generalized Auto-Regressive Conditional Heteroskedasticity (GARCH) model, and the Stochastic Volatility model. Both techniques are used in the finance literature to model returns on an asset; the main difference between the two is that the former holds volatility as deterministic, whereas the latter treats it as a stochastic component. Three 10-year periods (2006-15, 2008-17, and 2010-19) of returns of the S&P-500 Index are used to train the two models. The parameter estimation is done using Hamiltonian Monte Carlo. Then, using Sequential Monte Carlo updates, returns for 2016, 2018, …

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Chemostratigraphic And Paleoclimatic Studies Of Cloverly Formation, Northern Wyoming, U.S.A, Queen Amarachi Kalu Aug 2023

Chemostratigraphic And Paleoclimatic Studies Of Cloverly Formation, Northern Wyoming, U.S.A, Queen Amarachi Kalu

Graduate Theses and Dissertations

The Early – Late Cretaceous transition in Western North America recorded a period of rapid climatic and tectonic change in Earth’s history. Major climate events associated with large igneous province eruptions caused several instances of ocean anoxic events (OAE) and perturbations to the global carbon (C) – cycle. These perturbations to the global C-cycle are observed in the bulk organic C record of both marine and terrestrial deposits and can be used to correlate units across major depositional basins. Major efforts are being made to generate time-constrained palaeontologic and paleoclimate information from the North American Cordilleran foreland basin and C-isotope …

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On Neo-Humean Accounts For Natural Laws, Tori Helen Cotton Aug 2023

On Neo-Humean Accounts For Natural Laws, Tori Helen Cotton

Graduate Theses and Dissertations

Humeanism about laws is a metaphysical doctrine that claims that the complete scope of the world is comprised of the mosaic—a vast collection of particular, localized facts about the world, and everything else supervenes on this arrangement of facts. Reductionism about laws, the claim that laws of nature reduce to, and thereby supervene on, the Humean mosaic, follows from this view. The first part of the thesis explores Humeanism about laws and the evolving landscape of pragmatic approaches within this domain. Building upon the insights gained from this analysis, the second part of the thesis proposes a novel response to …

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