Digital Commons Network^™

Structures And Daq System For The Lox/Lch4 500 And 2000 Lbf. Rocket Engines, Rachel Pilgrim

Open Access Theses & Dissertations

With the progression of space exploration and research, new alternative fuels and fuel combinations have been discovered. The ability to produce methane from Mars' atmosphere and oxygen from Mars' regolith has led to the two becoming a great alternative propellant combination for rocket propulsion systems. To further advance LOX/LCH4 propulsion systems, a 500 and 2000 lbf rocket engine were designed and manufactured and are to be launched from the MIRO cSETR Technology Research and Innovation Acceleration Park (tRIAc) in Fabens, Texas for data collection and analysis. The objective of this thesis is to give a thorough overview of the static …

Analyzing Teachers' Technological Pedagogical And Content Knowledge, Diana Minerva Camberos

Open Access Theses & Dissertations

This qualitative study analyzes the ways a professional development course entitled Sol y Agua helped teachers to acquire technological, pedagogical, and content knowledge (TPACK) and to implement technology in their classroom. This study also analyzes the experiences teachers had in the workshop and the recommendations they had to improve the workshop. TPACK is a framework which denotes that teachers have a deep understanding of how to represent content using technology, and that the technology is used effectively to teach the content knowledge. Technology is integrated as a component of the teacher content knowledge and the teaching topic, and not as …

The Implications Of Gender Roles On Hiv Risk Behaviors And Latinas' Hiv Risk Perception Among A College Sample, Juliana De Almeida Cardoso Smith

Open Access Theses & Dissertations

The primary aim of the proposed research was to investigate the moderating effects of gender roles in regards to HIV sexual risk behaviors and HIV risk perception. Human Immunodeficiency Virus (HIV) remains a serious public health concern that affects an estimated 1.2 million individuals in the United States, disproportionately affecting ethnic minorities. We hypothesize that gender roles will significantly moderate the relationship between HIV sexual risk behaviors and HIV risk perceptions. Additionally, we hypothesize that while subordinate marianismo and perceived partner's negative machismo will not moderate the relationship between HIV sexual risk behaviors and HIV risk perceptions by themselves; their …

A Method For Iron Determination During Copper Electrometallurgy And Its Application To The Calculation Of Current Efficiency, Daniel Pedro Cruz

Open Access Theses & Dissertations

With the objective of developing statistical models that describe iron kinetics under typical copper electrolytes as well as its effects on current efficiency and influence in cathodic and anodic behavior, a detailed electrochemical analysis is done in this work as a contribution to implement hydrometallurgical processes in the refining or winning process to produce high purity copper.

This Thesis evaluates the oxidation-reduction potential (ORP) of the Fe3+/Fe2+ couple in the H2SO4-Fe2(SO4)3-FeSO4-H2O and H2SO4-CuSO4-Fe2(SO4)3-FeSO4-H2O systems, with addition of different copper concentrations and temperatures up to 70°, typically employed in the industry. This study further validates and expands a thermodynamic expression developed …

Cradle To Grave Lifecycle Process Analysis For Transuranic Waste Management Los Alamos National Laboratory, Cesar Enrique Dominguez

Open Access Theses & Dissertations

Amid World War II, in the late 1930s, nuclear fission was discovered. This revolution gave way to the development of nuclear technologies, including the world's first atomic bomb; these advancements in nuclear research left behind radioactive waste. Radioactive waste is known as the byproduct of nuclear reactors, fuel processing plants, hospitals, nuclear research facilities, as well as the result from the decommissioning and dismantling of radiation-exposed buildings and materials. This byproduct may be dangerous to workers, the public, and the environment and must, therefore, be handled with utmost safety. Given this, radioactive waste must be processed, stored, and disposed of …

Geophysical Studies Of The Three Sisters Andesite, West El Paso, Texas, Alexander D'Marco Garcia

Open Access Theses & Dissertations

The Three Sisters andesite intrusion is part of series of three small igneous bodies that crop out in western El Paso to the north of the more extensive intrusions found on the University of Texas at El Paso campus and at Mount Cristo Rey. These Oligocene age intrusions are believed to form part of a deeper, more extensive igneous body that may lie beneath much of western El Paso and the southern Mesilla Valley. I used several geophysical techniques to determine the size and shape of the Three Sisters intrusion to better understand its connection to other andesite outcrops and …

An Evaluation Of A Tobacco Control Network Along The Us/Mexico Border, Dessaray Gorbett

Open Access Theses & Dissertations

Tobacco use is the leading cause of preventable death in the United States (U.S.), killing more than 480,000 people per year. Public health networks and coalitions have shown to be able to promote health behavior change. More specifically, coalitions and networks emphasizing tobacco control issues have proven to be effective in recent years. The Paso del Norte Tobacco Control Network (Network) grew out of a coalition in El Paso, TX and currently includes representatives from west Texas, southern New Mexico, and northern Chihuahua, Mexico. The current project evaluated the Network's collaborations amongst organizations, internal organizational structure, and knowledge on tobacco …

Modeling Correlated Data Via Copulas, Panfeng Liang

Open Access Theses & Dissertations

Copulas are widely used to model the dependency structure among components of multi- variate data sets. Elliptical copulas, such as Gaussian copula, are most popular copulas being used since many data sets follow elliptical distributions or meta-elliptical distribu- tions (Fang et al. (2002)). However, today's approaches and software packages require us to assume the specific category, such as Gaussian or Student's T, of the elliptical cop- ula before estimating it. In this Thesis, we will propose a Bayesian method using Markov chain Monte Carlo (MCMC) methods to estimate the density function of elliptical copulas without specifying it is the copula …

Narcocultura As Cultural Capital For Latinx Youth Identity Work: An Online Ethnography, Emiliano Villarreal

Open Access Theses & Dissertations

Why would young Latinxs want to be, talk, look, and act like narcos? This work analyzes the ways in which narcocultura has become an important source of cultural capital for many Latinxs. Narcocultura is the assemblage of music, video, television, and other forms of cultural production that feature figures of transnational narcotrafficking as central protagonists of their narratives. Based on a yearlong online ethnography, I examine the ways in which Latinx Facebook users appropriate and recontextualize narcocultura in their identity work through the lenses of LatCrit theory, critical discourse analysis, and personal lived experiences, which provided the departing point for …

Young Adults' Perceptions Of The U.S. National Anthem Protests: Examining The Role Of Form Of Expression, Empathic Concern, & Perspective-Taking, Daymon Wilson

Open Access Theses & Dissertations

The US national anthem protests, which is a movement that began when some athletes, most notably Colin Kaepernick, chose to not simply stand during the US national anthem, has had a major influence in numerous ways on people, regardless of whether they view it favorably or unfavorably. This study examines young adults' attitudes towards these anthem protests. This study is going to examine some possible determinants of the positive or negative perceptions about the anthem protest. The study will examine how young adults perceive the national anthem protest, positively or negatively. It will also determine if participants see one form …

Thermal/Mechanical Analysis And Development Of A 2000 Lbf Liquid Oxygen/Liquid Methane Rocket Engine, Marissa Garcia

Open Access Theses & Dissertations

The Center for Space Exploration and Technology Research (cSETR) is developing three rocket engines: a 5 lbf reaction control engine, a 500 lbf engine, and a 2000 lbf engine. All these engines utilize a liquid oxygen and liquid methane propellant combination. The reason methane was selected for the fuel is because methane is easy to store, is self-pressurizing, and readily available. There is also the possibility of creating methane on planets such as Mars through an electrolysis process on the ice water found on Mars.

The 2000 lbf engine, or the CROME-X, is a modular, steady-state pintle injector engine. It …

Cfd Dem Analysis Of A Dry Powder Inhaler, Antara Badhan

Open Access Theses & Dissertations

Dry powder inhalers (DPIs), used as a means for pulmonary drug delivery, typically contains a combination of an Active Pharmaceutical Ingredient (API) and significantly larger carrier particles. The micro-sized drug particles - which have a strong propensity to aggregate and a poor aerosolization performance - are mixed with significantly large carrier particles that are unable to penetrate the mouth-throat region to deagglomerate and entrain the smaller API particles in the inhaled airflow. The performance of a DPI, therefore, depends on entrainment the carrier-API combination particles and the time and thoroughness of the deagglomeration of the individual API particles from the …

Review Of Rights And Demands: A Foundational Inquiry, Nicholas B. Cornell

Reviews

No abstract provided.

Directory Of Services And Resources To Support Breastfeeding Initiation, Exclusivity, And Longevity In The El Paso Texas Region, Tiffany Nichelle Butler

Open Access Theses & Dissertations

Human milk is recognized as the ideal food for infants; however, in order for human milk to get to the infants, breastfeeding requires the support of the healthcare system. Among infants born in 2015 in United States, 4 out of 5 started to breastfeed and despite of this high rate, only 22% of mothers exclusively breastfed for 6 months. The decisions to breastfeed are influenced by multiple factors including breastfeeding education and support, hospital practices, and participating in tailored education programs. The Office of the Surgeon General has identified the need for healthcare systems to "guarantee continuity of skilled support …

Cross-Language Sense Priming, Jennifer M. Blush

Open Access Theses & Dissertations

Research has yet to systematically examine the extent to which activation spreads across multiple senses of words. The two present experiments focused on examining the effects of cross-language sense priming via processing polysemous words in and out of a sentence context. In Experiment 1, participants made semantic verification of word pairs; critical trials contained polysemous words. In Experiment 2, participants read sentences in an eye-tracker with critical sentences containing both instantiations of a polysemous word. Results from both experiments suggested that senses can be primed within and across languages. These results give support for the DFM's interconnective network of conceptual …

The Battle Off The Battlefield: Exploring Medical Cannabis Use Among U.S. Veterans Looking For Relief, Viridiana Edwards

Open Access Theses & Dissertations

This study analyzed the reasons U.S. veterans use cannabis, focusing on what ways cannabis is socially acceptable, what ways it is viewed as deviant, and to what extent veterans are using cannabis for pain and/or mental relief. To answer these questions, an open and closed ended questionnaire was created and was available online. My results showed that U.S. veterans were using medical cannabis due to the negative side effects from the pharmaceutical medication that they were prescribed, physicians not listening to them during their appointments, and for social integration.

Patient Perception In Quality Of Health Care In Civilian And Military Hospitals, Rodolfo Gonzalez Garza

Open Access Theses & Dissertations

The purpose of this research is to examine and relate Erving Goffman's theory and concept of total institution to the perceived experienced quality of health care that occurs in the treatment of patients, in both preoperative and postoperative surgical procedures, at civilian and military hospitals. Goffman argues that there is a distinct relationship between the medical staff and patients at the hospitals. The staff most often feels superior and correct in their actions, while the patients perceive themselves as weak, inferior, and defenseless. In my thesis, I use a qualitative method approach to determine how veteran patients perceive their quality …

Load Rating Mobility As A Framework For Bridge Owners, Bryan Keith Stephens

Open Access Theses & Dissertations

In this time of financial economy, bridge owners are faced with the important decision of where to focus financial assets while attempting to determine which structures are in most need. Bridge Engineers and researchers alike agree that a large portion of the United States bridge population are reaching the end of their design life. Researchers are currently investigating various means and methods of lengthening the amount of usefulness of these key pieces of infrastructure. This paper introduces the novel idea of bridge Load Rating Mobility and how it can be leveraged by stake holders to assist in making those financial …

Investigating Using Titanium Zirconium Molybdenum For Additively Manufacturing Aerospace Components, Justin Hunter Vanhoose

Open Access Theses & Dissertations

Mankind throughout history has possessed an innate characteristic to explore, migrating to new frontiers.The requirement for this travel is most broadly associated with the need to pursue more resources. Rockets have been used as a means of weapons since the Sung Dynasty in the thirteenth empire and have now been integrated for travel/transport. The sophistication of rocketry and propulsion has reached a level to where it is plausible that mankind will be a multi-planetary species. The space industry has grown significantly with the advancement of the sophistication of these rocket technologies. However, a specific challenge to overcome in the space …

Angels And Sub-Divine Supernatural Beings: Their Characteristics, Function, And Relationship To God And Humanity In Deuteronomy-Kings, Joni Amanda Mcguire-Moushon

Dissertations

This research analyzes selected passages in Deuteronomy-Kings in order to determine the characteristics and roles of supernatural sub-divine beings within these books. Then this data is compared with the angelology of the Second Temple period in order to identify the similarities and the extent of the differences between them.

Deuteronomy contains references to supernatural sub-divine beings, such as “demons” and “holy one(s)”. While Deuteronomy affirms the existence of sub-divine beings, it forbids the Israelites to worship them. In the books of Joshua and Judges, there is awareness of supernatural beings and their roles as warriors, messengers, and tormentors. However, in …

Examining Perceptions Of Service Quality Of Student Services And Satisfaction Among International Students At Universities In Indiana And Michigan, Mordekai Ochieng Ongo

Dissertations

Problem

Universities in the United States face financial constraints, intense competition for students, declining student enrollment, and constant student attrition. However, an increasing number of international students seek higher education abroad, especially in the U.S. Providing quality services to these international students might help institutions attract and retain more of them. Unfortunately, little empirical research has been done on international students’ perceptions of service quality, especially of non-academic services. This study fills that gap by using a modified SERVPERF questionnaire to investigate international students perceived service quality and satisfaction at eight universities in Indiana and Michigan.

Method

The purpose of …

Islam, Christianity, Traditional Religions And Power Politics In Northern Nigeria Since Pre-Islamic Period, Emmanuel M. Abar

Dissertations

Problem

Currently in Northern Nigeria, religious interaction among the three major religious traditions, Islam, Christianity, and African Traditional Religion, is marred by violent religious conflicts. Also, competing concepts of religious legitimacy, which appeal to the historical heritage of Nigeria, are often used to validate and justify the violation of religious freedom. Does the current state of religious interaction among the various religious groups reflect the true heritage of religious interaction in Northern Nigeria? Or is it possible that the history of the interaction between African Traditional Religions, Islam, and Christianity in the past might actually be a heritage that points …

School Principal's Leadership Style And Teacher's Self-Efficacy In High And Low Achieving Schools In Chikankata, Zambia, Pardon Mwansa

Dissertations

Problem and Purpose

Much research has been done in past years on the topic of student achievement, with most of those studies focusing on factors that contribute to student achievement. Little, or no research has been done, especially in the country of Zambia, that has focused on the relationship between leadership style, teacher self-efficacy, and the extent to which these constructs impact student achievement. This study explored the school principals' leadership style, teacher self-efficacy, and the extent to which these factors contribute to student achievement in Chikankata District, Zambia. The Ministry of Education in Zambia and other educators, especially those …

Academic Literacies Twenty Years On: A Community-Sourced Literature Review, J Hilsdon, C Malone, A Syska

School of Law, Humanities and Social Sciences

In 1998, the paper ‘Student writing in higher education: an academic literacies approach’ by Mary Lea and Brian Street reinvigorated debate concerning ‘what it means to be academically literate’ (1998, p.158). It proposed a new way of examining how students learn at university and introduced the term ‘academic literacies’. Subsequently, a body of literature has emerged reflecting the significant theoretical and practical impact Lea and Street’s paper has had on a range of academic and professional fields. This literature review covers articles selected by colleagues in our professional communities of the Association for Learning Development in Higher Education (ALDinHE), BALEAP …

Working Memory And Attention As Predictors Of Processing Speed In Elementary School Students: A Developmental Study, Monih Alshehri

Dissertations

Problem

Many studies suggest that Processing Speed (PS), Attention, and Working Memory (WM) are major cognitive functions that collaborate to achieve a coherent cognitive system. The aim of the current study was to improve the conception of how these cognitive functions interrelate. The study addressed two main questions: the first, whether PS can be predicted by WM (visual, verbal, and the central executive) and attention of elementary students in first and fifth grade; the second, whether there are gender differences in the rate of change in WM and PS from first to fifth grade.

Method

The participants were taken from …

A Satellite Assessment Of Environmental Controls Of Phytoplankton Community Size Structure, Colleen B. Mouw, Audrey B. Ciochetto, James A. Yoder

Graduate School of Oceanography Faculty Publications

Phytoplankton play a key role as the base of the marine food web and a crucial component in the Earth's carbon cycle. There have been a few regional studies that have utilized satellite‐estimated phytoplankton functional type products in conjunction with other environmental metrics. Here we expand to a global perspective and ask, what are the physical drivers of phytoplankton composition variability? Using a variety of satellite‐observed ocean color products and physical properties spanning 1997–2015, we characterize spatial and temporal variability in phytoplankton community size structure in relation to satellite‐based physical drivers. We consider the relationships globally and by major thermal …

Mothering The Aggressive Child, Katja Ermann

Antioch University Dissertations & Theses

This qualitative study explores the experience of mothers parenting significantly aggressive children, ages five to 10. Little has been known previously about how women experience this aggression or the social and psychological impacts it has on them. This dissertation highlights the women’s understandings to provide a solid basis for theoretical explication using a Constructivist Ground Theory approach. Significant findings include the invisibility and stigma the women feel and the ways in which the experience is similar and dissimilar to other forms of family violence, particularly adolescent-on-parent violence (APV). Differences were found in social stigma between women whose child has a …

Polyamorous Millenials In Therapy: Interpreting Experiences To Inform Care, Rebecca Calhoun-Shepard

Antioch University Dissertations & Theses

Polyamory (poly) refers to a way of loving involving multiple concurrent romantic relationships. It has been suggested that consensual non-monogamies are becoming increasingly visible, particularly in the millennial generation. This warrants exploration of cultural considerations and the unique needs of this population to inform care and minimize potential for harm. The present study used interpretative analysis to explore the phenomenon of polyamorous millennials in therapy as described across semi-structured interviews with therapists and poly clients. Three primary themes emerged from aggregate data, including Idiographic Experiences in Therapy, Therapy with Polyamorous Millennials, and information about Polyamory and Millennials beyond a therapy …

Helping Animals, Helping Ourselves: Reciprocal Benefits Of Prosocial Behaviors Directed Toward Animals, Casey A. Culligan

Antioch University Dissertations & Theses

This is a dissertation project on the reciprocal benefits—to volunteers and animals—of volunteering at animal shelters, rescues, and sanctuaries. I have provided a brief literature review on the relationship between prosociality and helper/recipient wellbeing, highlighting the current scarcity of research on the human enactment of prosocial behavior with animal recipients of help. I then further supported the need for continued research in this regard by examining the emerging body of research on the suggested wellbeing-benefits of human–animal interaction. An ecopsychological framework was utilized to emphasize the potential therapeutic affects (to both humans and animals) of engaging in prosocial behaviors directed …

Insomnia, Race, And Mental Wellness, Debbie D. Hendley

Antioch University Dissertations & Theses

This phenomenological study examines the experiences of insomnia among sixteen Americans who are descendants of people who lived in the United States during chattel slavery. The investigation is guided by the following two central questions: Is the lived experience of insomnia among African Americans the same as the experience among non-Hispanic White Americans? In addition, what is the lived experience of sleep among African Americans and Non-Hispanic White Americans? Each participant met individually with the researcher and privately reflected on their experience with insomnia defined here as a condition in which individuals have difficulty initiating and maintaining sleep that furthermore …