Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Theses and Dissertations

Discipline
Institution
Keyword
Publication Year
File Type

Articles 9811 - 9840 of 74542

Full-Text Articles in Entire DC Network

Assessment Of Spatial And Temporal Variations In Chloride Concentration In An Agricultural Tile-Drained Area In Central Illinois, Okiemute Commander Apr 2023

Assessment Of Spatial And Temporal Variations In Chloride Concentration In An Agricultural Tile-Drained Area In Central Illinois, Okiemute Commander

Theses and Dissertations

Long-term increase in chloride (Cl-) concentration in surface water and groundwater from anthropogenic sources, including deicing salts, agriculture, septic effluents, and wastewater treatment plants is a growing cause for concern all over the world. In rural midwestern US with predominant agricultural land usage and less impervious surface cover, agriculture may serve as a potential source for Cl- in surface and groundwater systems. A saturated riparian buffer (SRB) installed adjacent to a central Illinois stream to reduce nutrient losses was used to identify populations of Cl-, substantiate agricultural influence, and identify spatial and temporal Cl- variations within the SRB. 2297 water …

Go to article

Becoming Good: Muslims Pursuing Moral Personhood In A Rural French Town, Clayton S. Van Woerkom Apr 2023

Becoming Good: Muslims Pursuing Moral Personhood In A Rural French Town, Clayton S. Van Woerkom

Theses and Dissertations

This thesis examines how members of a Muslim community (made up of migrants and their descendants from various parts of North Africa, West Africa, Turkey, and elsewhere) in a small town in France seek to become moral persons through Islam. I argue that this quest for moral recognition is informed simultaneously by Islamic and French Republican values, which my French Muslim interlocutors usually conceive of as being consistent with one another. I contrast this analysis with other scholarly approaches to Islam in France that have generally explored the way non-Muslims perceive Islam to be at odds with Frenchness, how Muslims …

Go to article

Healing Practices And Ritual Feasts Among The Nabateans: A Study Of Absorbed Residues From Ceramics On The Ad-Deir Plateau, Jake Hubbert Apr 2023

Healing Practices And Ritual Feasts Among The Nabateans: A Study Of Absorbed Residues From Ceramics On The Ad-Deir Plateau, Jake Hubbert

Theses and Dissertations

Eastern Cistern B on the Ad-Deir Plateau is unusual in its breadth and variety of ceramic vessels represented by thousands of sherds. These sherds raised significant questions about the purpose and use of the vessels that they originally came from. This thesis argues that the ceramic vessels that were deposited in Eastern Cistern B represent the deposited remains of an ancient Nabataean ritual feast. Furthermore, this thesis also helps to answer the questions surrounding what the ceramic containers once held and their relationship to that ritual meal. This thesis identified residues absorbed within the ceramic fragments through the use of …

Go to article

Soft Robot Configuration Estimation: Towards Load-Agnostic Soft-Bodied Proprioception, Christian Peter Sorensen Apr 2023

Soft Robot Configuration Estimation: Towards Load-Agnostic Soft-Bodied Proprioception, Christian Peter Sorensen

Theses and Dissertations

The objective of the work described in this thesis is the development of a configuration estimation scheme for quasi soft-bodied robots, with the end goal being accurate soft-robot proprioception to enable robotic manipulation of unknown external loads. The first chapter introduces the problem and state-of-the-art modeling methods. The second chapter presents work we did building on previous research on a novel sensing scheme for soft-bodied robotic configuration estimation. The third chapter discusses the development of a geometric shape-sensing model based on overlapping tendon-length measurements. This model is geometrically exact for a body composed of two constant curvature segments in bending. …

Go to article

Introducing Stochastic Time Delays In Gradient Optimization As A Method For Complex Loss Surface Navigation In High-Dimensional Settings, Eric Benson Manner Apr 2023

Introducing Stochastic Time Delays In Gradient Optimization As A Method For Complex Loss Surface Navigation In High-Dimensional Settings, Eric Benson Manner

Theses and Dissertations

Time delays are an inherent part of real-world systems. Besides the apparent slowing of the system, these time delays often cause destabilization in otherwise stable systems, and perhaps even more unexpectedly, can stabilize an unstable system. Here, we propose the Stochastic Time-Delayed Adaptation as a method for improving optimization on certain high-dimensional surfaces, which simply wraps a known optimizer --such as the Adam optimizer-- and is able to add a variety of time-delays. We begin by exploring time delays on certain gradient-based optimization methods and their affect on the optimizer's convergence properties. These optimizers include the standard gradient descent method …

Go to article

Viejo Period Architecture In The Casas Grandes Region Of Northern Mexico, Samuel J. Jensen Apr 2023

Viejo Period Architecture In The Casas Grandes Region Of Northern Mexico, Samuel J. Jensen

Theses and Dissertations

The Casas Grandes region of northern Mexico is an understudied, though important, part of the culture area that has come to be known as the Northwest/Southwest (NW/SW). What studies have been conducted in the Casas Grandes region have focused on the Medio Period (approximately 1200-1450 AD) and the large site of Paquimé. Only a small amount of research has been conducted on the preceding Viejo Period (approximately 700-1200 AD). In this thesis, I create a clearing house of published Viejo Period architectural features excavated in the Casas Grandes region. I also analyze those features to develop our understanding of the …

Go to article

Having "The Talk": Discrepancies In Parent-Adolescent Sex Communication Frequency And Quality Associated With Adolescent Sexual Esteem, Joanna Beth Eldredge Apr 2023

Having "The Talk": Discrepancies In Parent-Adolescent Sex Communication Frequency And Quality Associated With Adolescent Sexual Esteem, Joanna Beth Eldredge

Theses and Dissertations

Repeatedly, parents have reported more frequent and higher quality sex communication with adolescent children than adolescents report taking place. The current study analyzes the discrepancy in parent-child report of sex communication with three main focuses: the magnitude of the discrepancy, whether parent or adolescent perception is more associated with adolescent sexual esteem, and whether the discrepancy is associated with adolescent sexual esteem. Using data from the Healthy Sexuality Project, we analyze a random sample of 620 families using a hierarchical linear regression to measure whether a discrepancy in parent-adolescent reports of the frequency and quality of sex communication has influence …

Go to article

Online Self-Compassion Training Vs. Expressive Writing: A Randomized Controlled Trial, Lauren Benyo Linford Apr 2023

Online Self-Compassion Training Vs. Expressive Writing: A Randomized Controlled Trial, Lauren Benyo Linford

Theses and Dissertations

Self-compassion is associated with a variety of positive outcomes including well-being and positive body image. There is a need for accessible online self-compassion resources that can be disseminated to the general public. This study examined the efficacy of The Gift of Self-Compassion course (GSC): a 30-day internet-delivered self-compassion training within a non-clinical general population sample. Outcomes examined were self-compassion, well-being, and body dissatisfaction. Using a randomized controlled design, this study compared the GSC to an expressive writing (EW) curriculum. Participants were 215 adults from the general population. Seemingly unrelated regression models were used to estimate treatment differences between groups as …

Go to article

Working-Through Traumatic Memory In Young Adult Fiction, Amanda Charles Apr 2023

Working-Through Traumatic Memory In Young Adult Fiction, Amanda Charles

Theses and Dissertations

Despite the growing presence of trauma and abuse narratives in young adult literature (YAL), adolescent traumatic memory has largely been left out of the conversation. To better understand how contemporary memory scholarship is manifested in YAL, the following essay will offer a close reading of Staying Fat for Sarah Byrnes (1993) by Chris Crutcher and Speak (1999) by Laurie Halse Anderson in conjunction with adolescent memory research. The accuracy of traumatic memory representation in these novels confirms the value of YAL as a means for youth to interact with and learn about traumatic memory, its processes, and its effects.

Go to article

Studies On Osh6 And Its Pro-Aging Mechanisms, Nazneen Begum Apr 2023

Studies On Osh6 And Its Pro-Aging Mechanisms, Nazneen Begum

Theses and Dissertations

The target of rapamycin complex 1 (TORC1) is a master regulator of cell growth as well as a negative regulator of longevity. A recent study in yeast showed that the vacuolar TORC1 stimulates protein synthesis and cell growth while the endosomal TORC1 inhibits autophagy, a pro-longevity process. Since late endosome frequently exchanges membranes with vacuoles, the spatial dissection of TORC1 raises an interesting question as to how to inhibit the endosomal TORC1 and boosts the vacuolar TORC1 to extend the health span. In my thesis, I employed a longevity mutant that mildly up-regulates Osh6 (PERG6-OSH6) to address this question. I …

Go to article

Using Acoustic Sound Indices To Investigate Sources Of Turbidity In A Midwestern Agricultural Stream, Youmi Kay Hong Apr 2023

Using Acoustic Sound Indices To Investigate Sources Of Turbidity In A Midwestern Agricultural Stream, Youmi Kay Hong

Theses and Dissertations

Turbidity is an important measure of drinking water quality. However, there is difficulty ascertaining sources of turbidity due to the resources needed to monitor streams and can be puzzling when there are diel cycles within a stream despite no changes in water level. Six Mile Creek, located in Mclean County, Illinois, is a small agricultural stream in the Evergreen Lake watershed that exhibits diel turbidity cycle changes of 10 NTUs. We hypothesized that turbidity is being caused by increased bioactivity in the stream at night. To understand the potential for bioactivity to influence diel turbidity cycles we deployed a hydrophone …

Go to article

Designing For Multigenerational Households In The United States, Dongniya Xiu Apr 2023

Designing For Multigenerational Households In The United States, Dongniya Xiu

Theses and Dissertations

Aging has become a challenging issue worldwide as well as in the United States where the high cost of nursing homes and unfriendly insurance plans have exacerbated the situation. To address this issue, multigenerational living arrangements have gained attention to bring financial, social, and environmental benefits, and reduce social isolation and loneliness among older adults. Researchers employed qualitative research methods by gathering data from open-ended interviews and observations to explore interior design needs and concerns and to identify necessary adjustments to promote aging-friendly living environments for multigenerational households. A total of 8 participants from four multigenerational households were conducted in …

Go to article

A Statistical Approach For Analyzing Expectations Alignment Between Design Teams And Their Project Stakeholders, Matthew Christian Goodson Apr 2023

A Statistical Approach For Analyzing Expectations Alignment Between Design Teams And Their Project Stakeholders, Matthew Christian Goodson

Theses and Dissertations

Successful project management requires continuous communication aligning the expectations between project stakeholders and the project team. Expectations include both product expectations (how the product will look, feel, and perform) and programmatic expectations (timelines, deliverables, expenditure of project resources). In order to make the most effective use of project resources throughout the life of the project, a process or tool for quickly aligning expectations as closely as possible should be employed early on in the project. Project management literature is lacking in tools for aligning expectations, and solutions and best practices need to be determined since the current best option is …

Go to article

Determining Factors In Self-Guided Language Learning: Comparing More And Less Successful Learners, S. Daniel Wright Apr 2023

Determining Factors In Self-Guided Language Learning: Comparing More And Less Successful Learners, S. Daniel Wright

Theses and Dissertations

Informal language learners from extended language immersion settings such as missionaries often have very disparate outcomes. Some learners achieve high proficiency levels while others fossilize in their interlanguage once they reach basic communicative competence. Could these differences in language outcomes be explained by learning strategies, motivation, or other psychological factors? To investigate these differences, 20 participants were selected based on participation in a post-mission language ability self-assessment resource (LASER) who had taken an Oral Proficiency Interview – Computer (OPIc). These learners were interviewed to probe beyond the LASER and discover what factors seemed to correlate with higher language proficiency outcomes. …

Go to article

Gradient-Based Optimization Of Highly Flexible Aeroelastic Structures, Taylor G. Mcdonnell Apr 2023

Gradient-Based Optimization Of Highly Flexible Aeroelastic Structures, Taylor G. Mcdonnell

Theses and Dissertations

Design optimization is a method that can be used to automate the design process to obtain better results. When applied to aeroelastic structures, design optimization often leads to the creation of highly flexible aeroelastic structures. There are, however, a number of conventional design procedures that must be modified when dealing with highly flexible aeroelastic structures. First, the deformed geometry must be the baseline for weight, structural, and stability analyses. Second, potential couplings between aeroelasticity and rigid-body dynamics must be considered. Third, dynamic analyses must be modified to handle large nonlinear displacements. These modifications to the conventional design process significantly increase …

Go to article

Migration Of Elk (Cervus Canadensis) And Barriers To Movement, Levi Watkins Apr 2023

Migration Of Elk (Cervus Canadensis) And Barriers To Movement, Levi Watkins

Theses and Dissertations

Movement patterns of animals are varied, complex, and can be influenced by environmental and anthropogenic factors. One form of animal movement, migration, is influenced by environmental factors that alter the timing, duration, intensity, and likelihood of migration. Additionally, features of the landscape, both natural and anthropogenic, can alter how animals move through their seasonal and home ranges. Movement patterns can be impeded or prevented by features such as railroads, rivers, and roads. Here we explore characteristics of elk (Cervus canadensis) migration by evaluating the strategies of migration exhibited and the factors that influence migration of elk in central and eastern …

Go to article

Zero And Few-Shot Concept Learning With Pre-Trained Embeddings, Jamison M. Moody Apr 2023

Zero And Few-Shot Concept Learning With Pre-Trained Embeddings, Jamison M. Moody

Theses and Dissertations

Neural networks typically struggle with reasoning tasks on out of domain data, something that humans can more easily adapt to. Humans come with prior knowledge of concepts and can segment their environment into building blocks (such as objects) that allow them to reason effectively in unfamiliar situations. Using this intuition, we train a network that utilizes fixed embeddings from the CLIP (Contrastive Language--Image Pre-training) model to do a simple task that the original CLIP model struggles with. The network learns concepts (such as "collide" and "avoid") in a supervised source domain in such a way that the network can adapt …

Go to article

Overcoming Barriers To Native Species Restoration Using Gibberellic Acid And Fungicide Seed Coatings, Amber Jo Johnson Apr 2023

Overcoming Barriers To Native Species Restoration Using Gibberellic Acid And Fungicide Seed Coatings, Amber Jo Johnson

Theses and Dissertations

Many barriers can limit restoration success. In the first chapter of this thesis, the barrier of strong seed dormancy is addressed. While dormancy benefits the species' long-term survival, it can present a challenge within a restoration scenario where rapid establishment is required. Soaking seeds in gibberellic acid (GA3) can overcome dormancy. An easier and potentially more effective method to apply this hormone is to coat seeds with a GA3-impregnated polymer, which provides a slow release of the hormone. Seed dormancy can also be mitigated by creating a favorable microsite with increased soil moisture. We compared the emergence and establishment of …

Go to article

Volatile Organic Compound Identification Using Metal Oxide Sensors And Machine Learning, Hunter Tiner Apr 2023

Volatile Organic Compound Identification Using Metal Oxide Sensors And Machine Learning, Hunter Tiner

Theses and Dissertations

Volatile Organic Compounds (VOCs) are emitted gases that include many chemicals that can be created by biological processes or the byproduct of industrial processes, and can be present in a variety of pollutants. VOCs can cause a variety of ailments in humans and animals, and are expressed in plants as a way of signaling damage or the presence of pests. In this Thesis, an Internet of Things (IOT) E-nose device is outfitted with a gas array of eight Metal Oxide Semiconductor (MOS) type gas sensors, which are sensitive to a broad range of VOCs, yet lack selectivity and are unable …

Go to article

Reporting Factors Of Sexual Assault On College Campuses, Kia Mills Apr 2023

Reporting Factors Of Sexual Assault On College Campuses, Kia Mills

Theses and Dissertations

Sexual assault occurs when a sexual act is attempted against an individual’s will. A large concern regarding sexual assault on college campuses is the lack of reporting. The purpose of the current study is to focus on the different reporting factors of college campus sexual assault and to identify the factors that impact students’ disclosure of sexual assault incidents. The need for research on this topic is to provide more information to colleges and universities and their students on the many factors that are still persistent in preventing students from reporting campus sexual assault experiences. Additionally, the current study is …

Go to article

Development, Reliability, And Validity Of A Measurement Of Attitudes Toward Non-Binary Individuals, Jane Green Apr 2023

Development, Reliability, And Validity Of A Measurement Of Attitudes Toward Non-Binary Individuals, Jane Green

Theses and Dissertations

Researchers have commonly clustered together both binary transgender and non-binary individuals in their research studies. When assessing attitudes, it is likely that attitudes toward these two groups have been combined leading to valuable reports of attitudes missing from the literature. While measurements within the field of psychology have been created to assess attitudes toward binary transgender individuals, there currently is no measurement to assess attitudes toward non-binary individuals. As such, three studies were conducted to create a reliable and valid measurement of attitudes toward non-binary individuals. In Study 1 Part 1, 33 items were reworded and utilized from previously created …

Go to article

Bacterial-Mediated Photocatalytic Organic Oxidation, Peter J. Pellegrinelli Apr 2023

Bacterial-Mediated Photocatalytic Organic Oxidation, Peter J. Pellegrinelli

Theses and Dissertations

Bacteria, though well-known and widespread in scientific application, have plenty more opportunity to grow in the field of organic synthesis. The primary objective of this project was to apply the use of bioluminescent bacteria in an organic photoredox reaction intending to use the bacteria as a renewable source of light. This sustainable method, as opposed to high wattage bulbs, paves a green pathway for organic photocatalytic reactions. Using bioluminescent E. coli, the focus was on performing organic oxidation reactions with a recyclable photocatalyst. When using bacteria in conjunction with chemicals like nitromethane, it was an obstacle to keep the E. …

Go to article

Perfusion Pressure-Flow Relationships In Synthetic Poroelastic Vocal Fold Models, Cooper B. Thacker Apr 2023

Perfusion Pressure-Flow Relationships In Synthetic Poroelastic Vocal Fold Models, Cooper B. Thacker

Theses and Dissertations

The purpose of this research was to study perfusion pressure-flow relationships in self-oscillating synthetic poroelastic vocal fold (VF) models before, during, and after vibration. This was accomplished by developing a custom ultra-soft poroelastic material, incorporating the poroelastic material as the cover layer in a synthetic VF model, and studying the model vibratory response and the flow rate of fluid perfused through the cover layer while undergoing flow-induced vibration. The custom ultra-soft poroelastic material was developed using the method of direct templating with sucrose spheres as the sacrificial template and silicone as the infiltration medium. The average modulus of elasticity of …

Go to article

A Game Theoretical Approach To Optimal Pitch Sequencing, William Melville Apr 2023

A Game Theoretical Approach To Optimal Pitch Sequencing, William Melville

Theses and Dissertations

This paper presents a game theoretical solution to the difficult challenge of optimal pitch sequencing. We model the batter/pitcher matchup as a zero-sum game and determine the equilibrium strategy for both the pitcher and batter. We conclude that the Stackelberg equilibrium and our newly defined decision point equilibrium serve as effective pitch sequencing strategies.

Go to article

Rigorous Computation Of The Evans Function, Devin Mcghie Apr 2023

Rigorous Computation Of The Evans Function, Devin Mcghie

Theses and Dissertations

We develop computer-assisted methods of proof for rigorous computation of the Evans function in order to prove stability of traveling waves. We use the parameterization method, series solutions, and the Newton-Kantorovich Theorem to obtain precise, rigorous error bounds for the numerical solution of the ODE used in the construction of the Evans function. We demonstrate these methods on a scalar reaction-diffusion model and on the Gray-Scott model.

Go to article

Experimental Validation Of A Vibration-Based Sound Power Method, Trent P. Bates Apr 2023

Experimental Validation Of A Vibration-Based Sound Power Method, Trent P. Bates

Theses and Dissertations

A vibration-based sound power (VBSP) measurement method is appealing because of its potential versatility in application compared to pressure- and intensity-based methods. The VBSP method is based on the well-known elementary radiators approach and is reliant on the acoustic radiation resistance matrix. Previous research has developed and validated the VBSP method for flat plates and cylinders. This thesis details work on extending the VBSP method to arbitrarily-curved structures. The approach of computing surface normal velocities from 3D velocity data measured by a scanning laser Doppler vibrometer (SLDV) is presented. This approach is validated with experimental sound power results of a …

Go to article

Factors That Influence The Recruitment And Retention Of Civil Engineers, Gina Young Souriac Apr 2023

Factors That Influence The Recruitment And Retention Of Civil Engineers, Gina Young Souriac

Theses and Dissertations

With a growing demand for civil engineers in the United States, understanding factors that influence students to choose civil engineering (CE) as a major in college, pursue an M.S. degree in CE, and persist in the CE industry can lead to valuable insights for recruitment and retention of future and current civil engineers. Additionally, understanding factors that prominently influence male and female civil engineers to persist in and depart from CE, separately, can lead to valuable insight towards improving focused recruitment and retention of both genders. This thesis includes three research studies that identify, analyze, and discuss these important factors. …

Go to article

Dorothy Wordsworth, Religion, And The Rydal Journals, Emily Stephens Kasper Apr 2023

Dorothy Wordsworth, Religion, And The Rydal Journals, Emily Stephens Kasper

Theses and Dissertations

Dorothy Wordsworth’s religious practices continued to evolve throughout her life. She was baptized Anglican, but after her mother’s death she resided with her mother’s cousin, where she practiced Unitarianism. When she later moved in with her uncle, she embraced evangelical Anglicanism. Records of her religious beliefs in her twenties are scarce, as after moving to Racedown with her brother William in 1795 and throughout her years living in Alfoxden, she rarely wrote of her involvement with organized religion. Only in the 1810s while at Grasmere did Dorothy Wordsworth begin to record a gradual return to church attendance. Concerning her religious …

Go to article

Sound, Stories, And Psychology: The Perceptions And Motivations Of Audiobook Consumption, Ellice K. Tan Apr 2023

Sound, Stories, And Psychology: The Perceptions And Motivations Of Audiobook Consumption, Ellice K. Tan

Theses and Dissertations

The demand for audiobooks is higher than ever--and increasing each year, surpassing the growth rate of electronic books, print books, and the US economy overall. Audiobooks have long been used to aid adolescent and struggling readers; however, recent studies have revealed that the majority of audiences consume audiobooks for the purpose of entertainment and relaxation. Despite this, much of the research available on audiobooks still applies to audiobooks as they are used in education. The purpose of this study was to understand the attitudes, opinions, and beliefs of people who love listening to audiobooks. The study was conducted using Q …

Go to article

Understanding Gendered Hierarchy In Highly Religious Couples, Jolyn C. Schraedel Apr 2023

Understanding Gendered Hierarchy In Highly Religious Couples, Jolyn C. Schraedel

Theses and Dissertations

Although religious beliefs often associate with gendered hierarchy in sociological studies, very few studies have examined religion and gendered hierarchy within intimate relationships. This study used an exemplary sample to explore how religious, heterosexual married couples view and possibly practice gendered hierarchy. Interviews from 77 highly religious, highly satisfied couples provided insight into the following themes: (1) the potential harm of hierarchy, (2) misunderstanding hierarchy, (3) rejection of hierarchy, and (4) acceptance of hierarchy. For couples who expressed acceptance of hierarchy, further exploration revealed subthemes explaining how they conceptualized this practice. Subthemes included (4a) mutual submission, (4b) joint discussion, and …

Go to article

First Prev Next Last