Digital Commons Network^™

Process Study And Control Of Electron Beam Melting Technology Using Infrared Thermography, Jorge Mireles

Open Access Theses & Dissertations

An IR camera was installed in an Arcam A2 system (Arcam AB, Mölndal, Sweeden) and layer-by-layer image acquisition was achieved. The camera's capability to detect manufacturing defects was evaluated by implementing computer vision techniques using LabVIEW measurement and programming software (National Instruments, Austin, TX). Thermal maps acquired by the IR camera allowed layer-by-layer part temperature to be recorded. A core objective of this research was to study the impact of processing temperature on EBM-fabricated Ti-6Al-4V parts and achieve controlled mechanical properties. In this research, build variations were achieved by modifying parameters that change processing temperature from the standard processing temperature. …

Identification Of Kinase Signaling Pathways Inducing Morphological Changes In Dendritic Cells Upon Leptin Treatment, Marisol Ann O'Neill

Open Access Theses & Dissertations

Leptin is a pleiotropic hormone secreted by white adipose tissue. Obesity leads to overexpression of leptin as a result of leptin receptor desensitization. Obese leptin serum levels (160ng/ml) have been found to enhance immune functions in macrophages, natural killer cells, B cells, T cells, and dendritic cells. Previous data from our lab suggests that obese concentrations of leptin cause morphological changes in DCs, although further studies are required to verify these results. We hypothesized that leptin promotes DC cytoskeletal changes though activation of PI3K signaling. Morphological and functional changes were evaluated in JAWS II immortalized DCs though microscopy, transwell migration, …

Dielectric And Complex Impedance Properties Of Tetravalent Hafnium (Hf 4+) Integrated Cobalt Ferrite, Luis Javier Sanchez

Open Access Theses & Dissertations

The work presented in this thesis was carried out to understand the effects of tetravalent hafnium (Hf4+) ion on the crystal structure and phase, surface morphology, electrical, dielectric and complex impedance properties of cobalt ferrite (CoFe2O4; CFO). Hafnium incorporated cobalt ferrite, CoFe2-xHfxO4, with x = 0.00, 0.05, 0.075, 0.10, 0.15 and 0.20 were prepared by the standard solid state ceramic synthesis method. X-ray diffraction (XRD) and scanning electron microscopy (SEM) characterizations were performed to determine the structural properties. Most important aspect of this study is to explore the dielectric and complex impedance properties as a function of variable temperature (T=300-1000 …

Asynchronous Logic Design With Increased Fault Tolerance And Optimized For Subthreshold Operation, Ivan Santos

Open Access Theses & Dissertations

Synchronization has always been an essential feature in electronic circuits, in which functionality is achieved by an appropriate flow of data with respect to time. An ideal concept of logic design would require every operation to happen instantly; however, the application of this principle to electronics is governed by the laws of physics, which influence the time to execute a process. In fact, the speed at which a microprocessor can perform logic operations is determined by the time that charging and discharging capacitive loads requires, and the time that electric signals spend when traveling through the circuitry. Consequently, the variation …

Expanding The Pipeline For Latino Bilingual Teachers: A Mixed Methods Study, Amabilia Valverde Valenzuela

Open Access Theses & Dissertations

Current education reform in the US requires teacher preparation programs to educate future teachers according to the certification standards set forth by each state. Certification for teaching in Texas requires that preservice teachers successfully complete a series of comprehensive examinations in their teaching fields and in professional knowledge before entering full-time teaching. However, researchers have argued (Gitomer, Brown, & Bonett, 2011) that the use of standardized tests often raises concerns about adverse impacts on members of minority groups, who often have lower test scores. The purpose of this research was twofold: First, to analyze factors that predict Mexican American teacher …

Parents' Perceptions And Awareness Of Cyberbullying Of Children And Adolescents, Bryan David Clarke

Antioch University Dissertations & Theses

New communication technology, including Facebook, Twitter, cell phones, and instant messaging, has connected people in ways that were unknown. The benefits for people contacting each other at a moment's notice are profound; however, these benefits bring new risks, such as, "cyberbullying," which is a development from traditional bullying. Cyberbullying is the use of the internet to perpetrate deliberate, repeated, and hostile behavior by an individual or group that is intended to harm another person or others. Cyberbullying affects large numbers of children and adolescents, but its psychological impact is not clearly understood, apart from people hearing anecdotes on the suicides …

Addressing Lesbian, Gay, And Bisexual Bullying: A Mindfulness-Based Intervention Manual, Melanie L. Ernould

Antioch University Dissertations & Theses

The following dissertation offers an intervention to combat the negative effects that bullying has
on lesbian, gay, and bisexual (LGB) youth in high school. The literature review demonstrates the need for such an intervention through examples of the damaging effects that such bullying has on LGB youth. These incidents of bullying are far too common in American schools, and the effects far reaching, as the media has been saturated with stories of “gay teen suicides” in recent years. While affirmative interventions are currently the status quo for work with LGB populations, it can be argued that these are limited. In …

Giardia Lamblia: Regulation Of Cyst Production By Glycosphingolipids, Tavis Lyle Mendez

Open Access Theses & Dissertations

The diplomonad protist, Giardia lamblia, colonizes and replicates in the small intestine of mammals. In humans, Giardia infection (known as giardiasis) can be symptomatic or asymptomatic with the former being associated with fatty stool, abdominal pain, malnutrition, and weight loss. Both cell-mediated and humoral immune responses against Giardia infection are possible, and adaptive responses have been reported to be important for controlling the infection. Non-immune components such as secretory immunoglobulin, intestinal lipids, and bile acids also play significant roles in determining the severity of the infection by Giardia.

Giardia exists in two morphologic forms--trophozoites and cysts--and maintains a simple life …

Benefits Of Baby Sign On Cognitive Development In Infants, Clarissa Navedo

Open Access Theses & Dissertations

Research in the area of baby sign language has increased dramatically over the past several years, however there is still a lack of research regarding baby signs effects on typical infant development, specifically in the area of cognition. The hypothesis of this study was that instruction of baby sign would be correlated with a significant increase in the development of cognition and language acquisition for infant participants. This study provided a five-week instructional course on baby sign for parents/caregivers to implement with their typically developing infants (n=11). The course provided instruction of baby signs, methods of implementation and encouragement to …

(Re)Mapping The Rhetorical Situation: Toward A Transactional Networked Ecology, Ramesh Kumar Pokharel

Open Access Theses & Dissertations

The existing theories of the rhetorical situation that focus on and around Bitzer's theory define the rhetorical situation as something "real," "genuine," "objective" based on historic reality. I believe that this modernist containment to perceive the rhetorical situation as fixed entities limit our understanding about it in a broader sense, because it cannot capture the changed meaning that naturally exists with the impact of new media and technology. With the advent of new media and technology, the notion of rhetorical situation also has changed and thus there is an exigence of a new theory of the rhetorical situations that better …

Tea Party Movement Mobilization: Examining The Role Of Emotive Cues And Strategic Appeals, Rebeca Beatriz Puentes

Open Access Theses & Dissertations

Campaign messages used by political parties have given scholars a rich opportunity to analyze the impact that such cues may have on voters. While voter mobilization and participation is a necessity for a democracy's survival, certain messages used by very conservative movements and conservative parties may encourage intolerance towards minorities. This study examines the racial cues and appeals used by the Tea Party movement in the United States and the influence that such emotionally-charged appeals have on citizen support for very conservative political parties, movements, and policies. As my main theoretical framework, I merge political opportunity theory and intergroup emotions …

Analysis Of Vehicle Interactions On Interstate Highways: Discrete Choice And Linear System Approaches, Alicia Romo

Open Access Theses & Dissertations

The research in this dissertation developed statistical and linear system models to predict driving behavior according to driver attributes, vehicle characteristics, car-following dynamics and/or driving conditions. The scope of this research was limited to the interaction of two vehicles traveling in the same direction on interstate highways.

The statistical models proposed in this research investigated the contributions of the different vehicle types on the manner and likelihood of collision. Discrete choice models were used to estimate the probability of the types of collision (rear-end, angle and sideswipe) as functions of driver attributes, striking and struck vehicle types, pre-crash driving actions …

Developing A Sustainable Ecotourism Foundation In Indonesian National Parks Using Cross-Cultural Adaptation And Communication Framing, Adriana Salas

Open Access Theses & Dissertations

Previous research on ecotourism in Southeast Asia has focused on its positive and negative effects for conservation. However, the focus in this particular study is to look at what it takes to run a successful ecotourism site in four diverse areas in Indonesia using communication elements like cross-cultural adaptation and communication framing. Communication should be used as a baseline for a successful site and should be used as the most useful tool to address issues and challenges in ecotourism project development.

A successful ecotourism site must carefully look at how their ideas and programs are framed. Ecotourism must also create …

Event Related Potential Changes In A Two-Stimulus Auditory Oddball Task In Concussed College Athletes: A Linguistic Component, Paola G. Sanchez

Open Access Theses & Dissertations

"Return to Play" decisions are done based on cognitive-communicative testing and clinical assessments; concussed athletes may benefit from electrophysiological testing for a more accurate representation of their recovery. The purpose of this study is to investigate the electrophysiological performance post-concussion analyzing the attentional differences using the traditional "oddball" paradigm with a CV linguistic component. Participants for this study were 6 male college athletes with a history of concussion and 10 participants with no history of concussion (controls). Athletes were evaluated using event-related potentials (ERPs) that were recorded during a consonant-vowel (CV) auditory oddball task. Both the P300a and P300b components …

The Impact Of Baby Sign On The Development Of Pragmatic Skills In Typically Developing Children, Lyna Marie Sullivan

Open Access Theses & Dissertations

The purpose of this study was to determine the impact of Baby Sign on the pragmatic development of typically developing children. The participants for the study were 11 typically developing children. A one group pretest posttest case study design was used to evaluate the impact of baby sign. Prior to parents and caregivers attending a 5 week course on baby sign language, each child was administered the Developmental Assessment of Young Children (DAYC). Although, measurements were taken of the child's social, cognitive, physical, adaptive, and communication skills, standard scores of only the social subtests from the pretest to the posttest …

Treatment For Children With High Functioning Autism: A Comparison Of Social Stories To Musically Adapted Social Stories, Veronica M. Torres

Open Access Theses & Dissertations

The incorporation of music and social stories has been seldom tested, thus a study which uses a single-subject, alternating treatment design assesses the effects of standard social stories versus musically adapted social stories on the pragmatic abilities of an individual with high-functioning autism is presented. The goal of this project was to determine whether read social stories versus musically adapted social stories would be more beneficial in reducing problem behaviors in a child with high-functioning autism. Both types of social stories were implemented with the participant and the data supported the effectiveness of both treatments. Though the musically adapted social …

Effects Of Augmentative And Alternative Device On Echolalia In Autism, Cynthia Valenzuela

Open Access Theses & Dissertations

This study was a systematic replication of Mueller and Forbes (n.d.), which evaluated the effects of a high-tech and low-tech augmentative alternative communication (AAC) device on reducing echolalia in a verbal child with autism during conversational speech. The participant for this study was a verbal eleven-year male, who was diagnosed with autism prior to the study. A single subject alternating treatment research design was used to evaluate the effect of a high-tech speech generating AAC device (Proloquo2go) on echolalia. The participant was seen periodically twice a week for two months and periodically for one month. A functional analysis(Prizant & Rydell, …

Extracting Fuzzy Measures From Sample Data: Optimization Algorithms And Applications, Xiaojing Wang

Open Access Theses & Dissertations

In Multi-Criteria Decision Making (MCDM), decisions are based on several criteria that are usually conflicting and non-homogenously satisfied. We use non-additive (fuzzy) measures combined with the Choquet integral to solve MCDM problems, for they allow to model and aggregate the levels of satisfaction of the several criteria of the problem at hand by considering the relationship between these criteria. In practice, it is difficult to identify such fuzzy measures. An automated process is then necessary and can be used when sample data is available. Several optimization approaches have been used to extract fuzzy measures from sample data, for example, genetic …

The Service-Learning Writing Classroom: A Safe Haven For Articulating Difficult Stories About Whiteness And Race, Adam Webb

Open Access Theses & Dissertations

Service-learning is an educational method that is usually examined for its practical applications and outcomes, and can help instructors and students to realize the connective aspect of classroom discussions, assignments, activities and discourses that occur within the community. In this respect, "connective" refers to more than just bridging the distance between the classroom and community using service-learning. Instead, it acts like the "connective human tissue" that unites individuals together. Individuals as biological beings themselves are the connective tissue that unites them linguistically, physically and emotionally. In essence, the connective human tissue that unites individuals together creates an intertwined community through …

Privacy-Invading Technologies And Recommendations For Designing A Better Future For Privacy Rights, Alexandra Rengel

Intercultural Human Rights Law Review

The concept of privacy has been discussed for centuries by philosophers, anthropologists, sociologists, and legal scholars. The importance that individuals place on privacy is beyond question and transcends geographical, cultural and racial boundaries. Individuals' need for secrecy and private space is so fundamental to forging relationships with others, and to preserving our sense of self, that a society with a complete lack of individual privacy would be unimaginable. A right to privacy protects individuals from having the contents of certain private information made public and regulates the means and manner by which that information is obtained. However, new technologies often …

Teachers' Perceptions Of The Availability And Need Of A Support Program For Students With Learning Difficulties Attending Elementary Schools In The Atlantic Union Conference, Lileth Althea Coke

Dissertations

Purpose of the Study. Support programs have been known to be very effective in helping students succeed academically, socially, behaviorally, and emotionally. The purpose of this study was to investigate teachers' perceptions of the availability and need of a support program for students with learning difficulties who attend elementary schools operated by the Atlantic Union (AU) Conference. The study also identified elements of a support program that teachers perceived as both available and necessary for the academic growth and development of these students.

Method. This study employed a survey research methodology in which survey questionnaires were used to gather information …

The Relationship Between Parental And Adolescent Religiosity Factors And Adolescent Sexual Risk-Taking Among Older Adolescents In The Anglophone/Latin Caribbean, Karen Christoffel Flowers

Dissertations

Problem: Sexually active youth across the Anglophone/Latin Caribbean have been identified as among the most-at-risk for HIV infection. Studies conducted in the United States have identified parental and religiosity factors associated with adolescent sexual risk-taking, but these relationships remain largely unexplored in the Caribbean region.

Method: This cross-sectional study, based on survey data generated by the Seventh-day Adventist Caribbean Youth Survey, investigated the relationship between parental and adolescent religiosity factors and sexual at-risk behaviors reported by adolescents ages 16-18 years attending Seventh-day Adventist Church-operated secondary schools across the region. Pearson correlations and multiple regression analyses were used to assess the …

The Influence Of University Personnel Upon Students' Spirituality At Selected Adventist Universities In West Africa, Isaiah Ola Abolarin

Dissertations

Problem and Purpose. The Seventh-day Adventist Church has a deep concern for youth and young adults' spirituality. Hence the church established institutions of higher learning with the aim of restoring in youth and young adults the image of God in which they were created. There are programs and activities in these institutions to accomplish the aim, but there is still concern among church leaders and parents that young people will abandon their faith and exit the church. This study explored the influence of interactions between students and university personnel in selected Adventist universities in West Africa that, apart from programs …

Narratives Of The Leadership Development Of Adults Who Served As Summer Camp Staff In The Mennonite Setting : A Multiple Case Study, Jason Harrison

Dissertations

Problem. Leaders today need a new set of knowledge and skills to be effective in collaborative environments. The focus of this study was to investigate how collaborative environments can contribute to leadership development. The purpose of this study was to describe how the collaborative environment of summer camp helped shape emerging adults as leaders. The summer camp setting is inherently collaborative and, therefore, can inform and develop leaders for future collaborative settings. The research question in focus for this study was, How do adults who served at a summer camp as emerging adults describe the experiences that helped shape them …

Error Costs & Ip Law, Joseph S. Miller

Scholarly Works

A court in doubt about an ip statute’s scope can err in two ways. It can wrongly narrow the ip right’s reach, or wrongly broaden it. The latter error, however, is worse: A wrongly broadened ip statute effectively creates new property. To correct erroneous broadening, unlike erroneous narrowing, the legislature must thus eliminate a now-established property right. And that is very hard to do. Courts cannot, of course, avoid making at least some mistakes. Courts can, however, prefer the mistakes that are easier, not harder, for the legislature to correct. This essay explores this error-cost-based approach to ip statutes, as …

How The Poor Got Cut Out Of Banking, Mehrsa Baradaran

Scholarly Works

The United States currently has two banking systems — one for the rich, one for the poor. It wasn’t always this way. Throughout U.S. history, the government has enlisted certain banking institutions to serve the needs of the poor and offer low cost credit to enable low-income Americans to escape poverty. Credit unions, savings and loans and Morris Banks are three prominent examples of government-supported institutions with a specific focus of helping the poor. Unfortunately, these institutions are no longer fulfilling their missions and high-cost, usurious, and sometimes predatory check-cashers and payday lenders have quickly filled the void. These fringe …

Death Panels And The Rhetoric Of Rationing, Elizabeth Weeks Leonard

Scholarly Works

This essay offers an explanation for the United States' continued resistance to universal health care as grounded in two taboos: taxation and rationing. Even we were willing to pay more in taxes to directly subsidize the cost of medical care for those in need, rather than our current system of indirect subsidization through private insurance risk-pooling and cost-shifting, we still would face the unavoidable reality of resource limitations. Attempts to limit resource consumption, however, have been strongly opposed, as evidenced by the "death panels" controversy. Governor Palin's grossly erroneous characterization of the Patient Protection and Affordable Care Act (ACA) rendered …

Persuasion Treaties, Melissa J. Durkee

Scholarly Works

All treaties formalize promises made by national parties. Yet there is a fundamental difference between two kinds of treaty promise. This difference divides all treaties along a fault line: Treaties that govern the behavior of state parties and their agents fall on one side. Treaties in the second category — those I call “persuasion” treaties — commit state parties to changing the behavior of non-state actors as well. The difference is important because the compliance problems for the two sets of treaties sharply diverge. Persuasion treaties merit our systematic attention because they are both theoretically and practically significant. In areas …

Marketing And Outreach In Law Libraries: A White Paper, Carol A. Watson, Amanda Runyon, L. Cindy Dabney, Liz Mccurry Johnson, Emily Lawson, Shira Megerman, Jaimie Sommer, Thomas J. Striepe, Michele Thomas

Scholarly Works

In recent years, libraries have turned to marketing and outreach to better educate library users about services and resources while gaining an understanding of their needs. Marketing and outreach are relatively new concepts in academic law libraries, and librarians tasked with these functions have found resources and examples of this type of work to be lacking. Though focused on academic law libraries, the article identifies the challenges facing all law libraries, explains why libraries need marketing and outreach plans, and provides examples of marketing and outreach successes.

State Action Problems, Christian Turner

Scholarly Works

The state action doctrine is a mess. Explanations for why federal courts sometimes treat the private actions of private parties as public actions subject to the Constitution, like the Supreme Court did in Shelley v. Kraemer, are either vastly overinclusive or fail to explain our law and values. A better approach is to understand the state action doctrine in institutional terms. I introduce a two-step, institutionally focused state action theory that is a natural consequence of a broader public/private theory of legal systems. In the first step, a court identifies a “state action problem,” meaning a privately made law that …