Digital Commons Network^™

Development Of A Transferable Student Engagement And Knowledge Retention Framework For The Earth Sciences, Sunay Palsole

Open Access Theses & Dissertations

The earth sciences play an important role in engaging students in science and in science, technology, engineering and mathematics (STEM) disciplines, because of the integrative nature of the disciplines. It then becomes important for us to provide an engaging experience for students taking earth science courses, because it serves a dual purpose of possibly increasing new majors in the discipline and helping to create a science literate population.

Given that a majority of students in the larger introductory courses are non-majors, it behooves us to explore alternative engagement techniques and measure their efficacy in student engagement, which in turn can …

Inviting Citizen Designers To Design Learning Management System (Lms) Interfaces For Student Agency In A Cross-Cultural Digital Contact Zone, Rajendra Kumar Panthee

Open Access Theses & Dissertations

Inviting Citizen Designers to Design Learning Management System (LMS) Interfaces for Student Agency in a Digital Cross-Cultural Contact Zone assesses how FYC students from periphery cultural and linguistic backgrounds perceive Blackboard Learn and other learning management system (LMS) interfaces. The report of an empirical study shows that the current LMS design does not provide writing students in general and writing students from periphery cultural and linguistic backgrounds in particular an opportunity of a higher-level interactivity with the LMS. The current design neither includes periphery students' cultural and linguistic norms and values, nor does it allow them to affect the existing …

Digitally Manufactured Spatially Variant Photonic Crystals, Javier Jair Pazos

Open Access Theses & Dissertations

Metamaterials and photonic crystals are engineered composites that exhibit electromagnetic properties superior to those found in nature. They have been shown to produce novel and useful phenomena that allow extraordinary control over the electromagnetic field. One of these phenomena is self-collimation, an effect observed in photonic crystals in which a beam of light propagates without diffraction and is forced to flow in the direction of the crystal. Self-collimation however, like many of the mechanisms enabled through dispersion engineering, is effective in directions only along the principal axes of the lattice. To this effect, a general purpose synThesis procedure was developed …

Public Social Network Sites And Social Recruiting, Abby Peters

Open Access Theses & Dissertations

Social network sites (SNSs) are an increasingly popular form of social media used by individuals and organizations. As these platforms continue to transform the way people communicate with one another, they are simultaneously revolutionizing the way individuals interact with organizations. Part of this dramatic change is apparent in the processes by which organizations are recruiting employees and job seekers are pursuing employment. To investigate these phenomena, I employed the diffusion of innovations theory in a SNS context to examine the relationship between organizations' use of their corporate career website and their use of SNSs as recruiting sources. Subsequently, I used …

Factors Affecting Student-Athletes' Perceptions Of Online Privacy Issues On Twitter: A Communication Privacy Management Perspective, Amanda Jo Pulido

Open Access Theses & Dissertations

Based on the communication privacy management perspective, this study examined student-athletes' perceptions of privacy issues on Twitter. This study used an online questionnaire survey to survey 5,576 student-athletes within C-USA. A total of 113 valid responses were used in the statistical analyses. Several linear regression analyses found that student-athletes' perceived control of private information flow on Twitter and their perceptions of choice significantly predicted the total months of using Twitter. Perceived control of private information flow on Twitter also predicts how many times they will check Twitter. Finally, student-athletes' perception of boundary ownership/linkage also predicts the total amount minutes spent …

Synthesis, Microstructure And Performance Evaluation Of Gadolinium Incorporated Cobalt Ferrite Ceramics, Md Taibur Rahman

Open Access Theses & Dissertations

Spinel structured ferrites exhibit remarkable properties and phenomena, which are attractive for application in sensors and actuators, magneto-electronics, and electrochemical energy storage devices. Among spinel ferrites, cobalt ferrite CoFe₂O₄ (CFO) has attracted remarkable attention and widely studied because of their electro-magnetic properties, chemical stability and mechanical hardness. The properties and phenomena of CFO ceramics are dependent on microstructure and chemistry, which in turn depend on the synThesis processes and conditions employed for fabrication. Generally exact chemical composition, processing temperature, reactive or processing atmosphere (if any) and the ions that substitute Fe³⁺/Fe²⁺ ions dictate the …

Inkjet Bioprinting Of Solid Peroxides For Constructing Oxygen Generating Scaffolds To Improve Cells Viability And Growth Under Hypoxic Environment, Daniel Reyna Soriano

Open Access Theses & Dissertations

Tissue engineering has emerged as an interdisciplinary field to overcome current challenges for tissue repair or replacement in the human body. In essence, it proposes new medical therapies customized to match the biology of specific patients. The potential benefits offered by tissue engineering have driven scientific inquiry to make it a clinical reality.

One of the current challenges in tissue engineering is to provide oxygen supply to thick tissues as oxygen diffusion is limited to 100 - 200 µm layer of viable tissue. Engineered vascular conduits are applied in vitro, providing pre-vascularization to tissues; however, host anastomosis is still a …

Effects Of Cerium Oxide Nanoparticles In Cereals: Insights Into The Toxicity Mechanisms And Macromolecular Modifications, Cyren Mendoza Rico

Open Access Theses & Dissertations

Despite the inundation of studies on the interaction of engineered nanomaterials (ENMs) with plants, investigations involving complete life cycle (i.e from seedling establishment to full maturity) are still lacking. Assessments on the nutritional value of plants cultivated to full maturity in ENMs-treated soil are also missing. Cerium oxide nanoparticles (nCeO2) have significant interactions with plants; however, there are no life cycle studies yet on their implications in cereals like rice (Oryza sativa L.), wheat (Triticum aestivum L.), and barley (Hordeum vulgare L.). These cereals are globally important crops that support the economic activity, and nutritional and health needs of billions …

Hydrogen Generation From Ammonia Borane And Water Through The Combustion Reactions With Mechanically Alloyed Al/Mg Powder, Daniel Rodriguez

Open Access Theses & Dissertations

Finding and developing a safe and effective method for hydrogen storage is integral to its use as an alternative source of energy. The goal of the studies described in this Thesis was to investigate the feasibility of developing combustible hydrogen-generating compositions based on ammonia borane and novel energetic materials such as nanocomposite and mechanically alloyed reactive materials, recently obtained by Prof. Edward Dreizin's team at the New Jersey Institute of Technology (NJIT). Such compositions could be stored for long time and release hydrogen on demand, upon ignition. The first phase of the research included thermodynamic calculations for combustion of ammonia …

Il-2rβ T450 Phosphorylation Is A Positive Regulator For Receptor Complex Stability And Activation Of Signaling Molecules, Blanca Estela Ruiz-Medina

Open Access Theses & Dissertations

Homeostasis of the immune system is required for proper defense against pathogenic insult. Cells of the innate and adaptive compartments provide a strictly regulated response to clear infections while allowing for self-tolerance. Dysregulation of the components of the immune system can lead to immunodeficiency, autoimmunity, and cancer. Key players of the immune response are T, B, and NK cells, which become strongly activated by IL2 through its receptor. The β subunit of the receptor becomes tyrosine, serine, and threonine phosphorylated upon induction with IL2. Phosphorylation of tyrosine residues has been extensively studied, however, the putative regulatory role of serine and …

Three Essays On Social/Political Structures And Icts Use, Seungeui Ryu

Open Access Theses & Dissertations

My research identifies how social structures affect the use of the Internet and/or a mobile chat application and how the Internet impacts the political structure of a nation. In my first essay of the 3-essay Dissertation, I am designing three models based on social structure theory that are used to study the Internet and a popular mobile chat application's use by managers in South Korea, with the help of a survey instrument. In my first essay, the contribution is on i) testing a model of manager's personal behavior on Information and Communication Technology (ICT) use at the individual level involving …

Identification And Characterization Of Novel Anti-Leukemia And Anti-Lymphoma Compounds, Yahaira Santiago

Open Access Theses & Dissertations

The anti-cancer properties of curcumin, the natural yellow pigment in the roots of turmeric (Curcuma longa), have been extensively described over the last century. It has been shown to interfere with multiple cell signaling pathways, including execution of apoptosis, anti-proliferation, anti-angiogenic, and anti-inflammatory properties. However, curcumin's cytotoxic potential is limited when administered in vivo. With the idea of preserving curcumin's characteristics, but improving its bioavailability, analogues have been developed and evaluated in the last decade. Most of the analogues have shown very good anti-cancer activity in various cell lines and one analogue is now in a clinical trial. Nonetheless, this …

The Multicultural Study Of Psychopathy: An Examination Of Latin American Differences, Chelsea Spraberry Tekell

Open Access Theses & Dissertations

Psychopathy is a personality disorder that is composed of characteristics that include poverty of empathy, lack of anxiety or fear, impulsive actions, and manipulation of others. The definition and measurement of psychopathy has changed over time and remains controversial. Ethnicity is an under researched area of psychopathy. In particular, previous psychopathy research has focused primarily on European American men. Despite increased attention to differences between African Americans and European Americans, Latin Americans continue to be overlooked, with only a small number of studies examining psychopathy among individuals from Latin ethnicities. The current study is among the first to examine psychopathy …

Finite Density Qed At Strong Magnetic Field, Paul Lee Springsteen

Open Access Theses & Dissertations

In this Thesis we study the effect of a dense medium on the quantum properties of a relativistic electron-positron plasma under a magnetic field. From the calculation of the photon polarization operator depending on temperature, chemical potential, and the magnetic field; we study how the electric susceptibility of the strongly magnetized plasma is charged with temperature and density. In the same manner we study the dependence of the Debye mass with density. Then we investigated the phenomenon of magnetic catalysis of chiral symmetry breaking for a dense medium. We found that there exist a critical value of the chemical potential …

3d Printed Spatially Variant Anisotropic Metamaterials, Cesar Roman Garcia

Open Access Theses & Dissertations

The recent advancement in 3D printing has created a new way to design electronics and electromagnetic devices. This allows for a new breed of non-planar designs to be used, fully exploiting all three dimensions like never before. More functions can be fit into the same amount of space, products with novel form factors can be more easily manufactured, interconnects can be routed more smoothly, interfaces can be better implemented, electrical and mechanical functions can be comingled, and entirely new device paradigms will be invented. When departing from traditional planar topologies many new problems arise like signal integrity, crosstalk, noise, and …

La Vida Es Truco, Luis Eduardo Álvarez Marí­N

Open Access Theses & Dissertations

La colección de historias La vida es truco, se centra en la historia de Eliseo, un niño de ocho años que espera a que su padre, un mago callejero y ladrón, regrese a casa. Durante la espera, el niño va contando a un narratario enigmático cada una de las aventuras que ha vivido con su padre, y a su vez va reconstruyendo la imagen que tiene sobre él: una figura mítica, un superhéroe que nunca se equivoca en nada. El volumén plantea temas como el engaño, la supervivencia, la paternidad y la infancia, en una familia disfuncional que intenta salir …

Perspectives On The Nature Of Science From A Group Of Students Attending Predominantly Hispanic West Texas High School, Cameron King Wilson

Open Access Theses & Dissertations

The United States is falling far behind the rest of the world in its ability to fulfill its needs for qualified workers in Science, Technology, Engineering, and Mathematics (STEM) fields. The Hispanic population is now the largest minority in the United States but is proportionally underrepresented in the STEM fields today. It is shown that students who have a good understanding of the Nature of Science (NOS) are far more likely to be interested in science which may lead to an interest in careers in STEM fields. There is very little if any research identifying Hispanic high school students' view …

An Avian Survey Conducted At Five Water Sources Within The Northern Chihuahuan Desert On Indio Mountains Research Station, Texas, Geoffrey Hugh Wiseman

Open Access Theses & Dissertations

The objective of this study was to conduct an avian survey of five water sources (four ephemeral former cattle tanks and one perennial spring), determine how many species inhabit or use Indio Mountains Research Station, and show a hierarchal similarity between the survey sites. This survey was conducted in a Chihuahuan Desert scrub landscape on Indio Mountains Research Station (IMRS) in Hudspeth County, Texas. There have been no previous formal studies of the avifauna at IMRS. All species accounts or sightings have been from casual sightings.

Eighty-five avian species were recorded during this project bringing the total of avian species …

Essays On The Digital Divide, Belal Abdelfattah

Open Access Theses & Dissertations

The digital divide is a phenomenon that is globally persistent, despite rapidly decreasing costs in technology. While much of the variance in the adoption and use of information communication technology (ICT) that defines the digital divide can be explained by socioeconomic and demographic variables, there is still significant unaccounted variance that needs to be explained if the world's population is expected to be brought more fully into the digital age. The present research addresses this need with three cross-country studies. Study 1 primarily investigates the time individuals spend with traditional media sources as a likely explanation for their frequency of …

Social Determinants Affecting The Mental Health Of Hiv Infected Latino Men Who Have Sex With Men Living On The U.S. - Mexican Border, Oscar Beltran

Open Access Theses & Dissertations

The HIV/AIDS global pandemic is more than three decades old, and although the continual advancement of antiretroviral therapies have successfully decreased the mortality rates of people living with HIV/AIDS (PLWHA), little has been done to improve their mental health status and positive inclusion in society (eliminating discrimination and stigma). This is especially true with the Latino PLWHA living in the U.S.-Mexico border area.

This paper presents data from a qualitative study focused on exploring the mental health issues of a subsample of 40 Latino men who have sex with men (MSM) living with HIV/AIDS on the U.S.-Mexico Border. This subsample …

Rolodex Of Saints: A Collection Of Short Stories, Yvette D. Benavides

Open Access Theses & Dissertations

A critical preface and collection of short stories.

Smart Grids: A Paradigm Shift On Energy Generation And Distribution With The Emergence Of A New Energy Management Business Model, Jesus Alvaro Cardenas

Open Access Theses & Dissertations

An energy and environmental crisis will emerge throughout the world if we continue with our current practices of generation and distribution of electricity. A possible solution to this problem is based on the Smart grid concept, which is heavily influenced by Information and Communication Technology (ICT). Although the electricity industry is mostly regulated, there are global models used as roadmaps for Smart Grids' implementation focusing on technologies and the basic generation-distribution-transmission model. This project aims to further enhance a business model for a future global deployment. It takes into consideration the many factors interacting in this energy provision process, based …

A Circuit-Based Algorithm For Two-Phase Flow At The Pore Scale In Porous Media, Todd Dorethy

Open Access Theses & Dissertations

Models of two-phase flow in porous media are of practical interest in many fields of science and engineering such as in oil recovery and hydrology. For this class of problem, an immiscible fluid is injected into a single-phase, porous medium to evict its valuable, native fluid. Because the aim is to amass as much of the indigenous fluid as possible, models attempt to output reliable flow regime patterns depicting how well the invading fluid displaces the native fluid.

Flow regime patterns generally depend upon the geometry of the domain, stimulation at the boundaries, and properties of the invading and native …

A Comparison Of Water-Related Perceptions And Practices Among Residents Living In Colonias In West Texas And South New Mexico, Relying On Container Or Well Water, Lydia Berenice Garcia

Open Access Theses & Dissertations

ABSTRACT

In the U.S. - Mexico border region, colonia residents must cope with the lack of clean water supply and other basic sanitary services. Because of the lack of infrastructure, colonia residents rely on alternative water supplies including either private wells or hauled water stored in large above-ground containers. Little is known about residents' perceptions of their water supplies, their use practices, and how water-related use and perceptions might differ between colonia residents relying on well water or container water. The purpose of this study was to examine the water-related perceptions and practices of people living in colonias, and to …

Reinventing The Old West: Concordia Cemetery And The Power Over Space, 1800-1895, Nancy Gonzalez

Open Access Theses & Dissertations

Utilizing Concordia Cemetery as a framework, this study analyzes the social and economic development of El Paso County and the surrounding areas after the U.S.-Mexico War (1846-48). The cemetery was a vast commercialized zone before it was a burial ground, and silenced histories, voices, and people that lived and thrived on this land are incorporated into this work. The role of the original owners, Hugh Stephenson and Juana Maria Ascarate, as well as the Mexican networks, intermarriage and Mexican American women, and the presence of ethnic Mexicans are subjects that are also examined. In addition, this Dissertation interrogates the pioneer …

North Korean Supernotes: Nuclear Arms Financed By Counterfeit Currency, Michael Yatskievych

Open Access Theses & Dissertations

Michael Yatskievych, University of Texas at El Paso

Abstract of Master's Thesis, Submitted 21 May 2014:

North Korean Supernotes: Nuclear Arms Financed By Counterfeit Currency

The primary purpose of this study was to evaluate whether DPRK is producing high quality counterfeit US currency, supernotes, and has determined to what extent supernotes are financing North Korea's emerging nuclear arms program.

The application of Analysis of Competing Hypotheses, ACH, satisfied this study's purpose by meeting the following objectives: the development of multiple hypotheses in an attempt to explain a supernote-nuclear arms program link, assessing evidence from assorted sources, providing a diagnostic weighing …

Decollations, Joseph Mcbirnie

Open Access Theses & Dissertations

The following presents the critical preface to the unpublished manuscript, Decollations. Through the tapestry metaphor, the author describes the process of creating the collection through the lenses of aesthetics, psychology and mythology.

A Variationist Sociolinguistic Study Of /R/ Deletion In Turkish, Sevda Rahymov

Open Access Theses & Dissertations

Variable /r/ deletion in word final position has been explored in several languages such as English and different dialects of Spanish. This study will investigate /r/ deletion in Turkish, an Altaic language that belongs to Ural-Altaic languages family. Specifically, the purpose of this study is to explore the influence of linguistic and social factors in the variation of /r/ in the progressive affix, /-yor-/ in the dialect of Turkish spoken in Istanbul. I hypothesize that the variability in the deletion of /r/ is not random, but can be accounted for by the study of linguistic and social factors.

Synthesis And Characterization Of Fluorophores For The Detection Of Lanthanides And Actinides, Robinson I. Roacho

Open Access Theses & Dissertations

A series of fluorophores based in the boron dipyrromethene (BODIPY) family were synthesized and characterized. These fluorophores have the capacity of being introduced to a carbamoyl methyl phosphine oxide (CMPO) lanthanide/actinide extractant. These blue, green and red emission fluorophores show high thermal/moisture stability and high fluorescence efficiencies. The fluorescence intensity seems to be dependent on the restricted rotation about the C(8)-C bond in 8-Ph-BODIPY. By taking advantage of this feature, a hydroxyl- containing BODIPY with high fluorescence intensity was synthesized to be incorporated to a CMPO carboxylic acid via esterification. Unfortunately, we did not observe an optical response upon the …

Transracial Adoption: Racial Identity, Resilience, And Self-Esteem Of African American Adoptees, Jennifer Aufiero Bumpus

Antioch University Dissertations & Theses

This study compared self-reported racial identity, resilience, and self-esteem of three independent sample groups consisting of African American adoptees (N = 45), aged 18–72. One group (n = 25) had been adopted by two Caucasian parents, the second (n= 10) by two African American parents, and the third (n = 10) by a single African American parent. The Multidimensional Inventory of Black Identity, Resilience Scale, and Rosenberg Self-esteem Scale were used. Adoptees had higher levels of racial identity when they had been adopted by two African American parents as opposed to two Caucasian parents. Racial …