Digital Commons Network^™

Implementation Of New System For Oxygen Generation And Carbon Dioxide Removal, Angelo Peter Karavolos

Open Access Theses & Dissertations

This research effort develops an integrated system for CO2 removal and O2 production. A unique material, dodeca-tungsto-phosphoric acid (H3PO4W12O3; henceforth referred to as DTPA) is mixed with tetra-ethyl-ortho-silicate Si(OC2H5)4 or TEOS. This mixture exhibits unique properties of heat absorption and high electrical conductivity. In the system described herein, the DTPA resides within a cross linked arrangement of TEOS. The DTPA furnishes a source of O2, while the TEOS furnishes structural support for the large DTPA crystals. In addition, the large amount of H2O within the crystal also adsorbs CO2. It can also be cross-linked with other polymers such as polycarbonate, …

Prevalence Of Dental Caries In Mexican-American Children And Adolescents Attending Rawlings Pediatric Dental Clinic In El Paso, Texas, Andrea Aguila

Open Access Theses & Dissertations

Abstract

Background and significance: Dental caries is the most common infectious disease in childhood, causing negative long and short term effects in a child’s life. Children living in poverty are twice as likely to be affected by dental caries compared to those living above the poverty level. Of this poverty group, Mexican-American children are the most affected. In the US-Mexico border communities 83% of the population is Hispanic with the majority of them being of Mexican descent, and 30% of those live in poverty. The United States Mexico border is also characterized by a rapid population growth, high unemployment rates, …

A Spatially Variant Metamaterial Design Process For Transformation Electromagnetic Devices, Eric Alan Berry

Open Access Theses & Dissertations

A technique for the implementation of devices designed using transformation optics (TO) is presented using metamaterial elements arranged using spatially variant lattices. A description of transformation optics, including the design of arbitrarily shaped devices by solving Laplace's equation numerically, is discussed. Analysis of a variety of metamaterial unit cells using frequency sweeps of the unit cells with the resulting permittivity and permeability values. Metamaterial unit cells are also analyzed by the scaling of all the features of the metamaterial elements in the unit cell and calculating the permittivity and permeability. Finite- difference time domain (FDTD) and finite-difference frequency domain (FDFD) …

Synthesis And Characterization Of Uranyl Dipyrrin Complexes For Environmental Applications, Duer Bolotaulo Bolotaulo

Open Access Theses & Dissertations

Persistent organic pollutants (POPs) are toxic chemicals that adversely affect the health of human populations as well as the environment. The need to develop remediation methods and materials as well as understand the mechanisms in which they can degrade POPs is necessary. Furthermore, heterogeneous phase metal based catalysts in place today do not fully understand the chemistry underlying degradation processes. The proposed research seeks to synthesize and characterize uranyl dipyrrin complexes to assess and understand the reactivity of uranyl dipyrrins with pollutants. Photophysical and electrochemical techniques will be used to characterize and determine the viability of utilizing the uranyl complexes …

A Mixed Methods Investigation Of The Faculty Teaching Role: Values, Intention, And Practice, Robin Dankovich

Open Access Theses & Dissertations

This research is a mixed methods investigation of the faculty teaching role through the exploration of values, intentions and practice of college professors. To compliment the research questions the literature review explores the forces shaping the professoriate over time, contemporary context of higher education, values, and conceptions of teaching. To frame the discussion Argyris and Schön’s (1974) theory of espoused values and values in use is coupled with the codification of human strengths offered by positive psychology.

The results of the study indicate that all faculty espoused values focused on love of learning, honesty, fairness and judgement. Those interviewed provided …

La Función Discursiva De La Antología De Poesía Centroamericana Puertas Abiertas Y La Configuración Del Sujeto Poético De La Generación Del Ochenta, Missael Duarte

Open Access Theses & Dissertations

El presente ensayo aborda la función discursiva de la antología Puertas abiertas (2011) desde el enfoque de los estudios culturales y analiza la configuración del sujeto poético en la generación del ochenta en los poetas antologados. El propósito de este trabajo es mostrar los criterios que sigue la antología antes mencionada en la tradición de las antologías de poesía centroamericanas.

The Impact Of Stress On Risk Perceptions And Risk Behaviors, Gabriel Andrew Frietze

Open Access Theses & Dissertations

As the national conversation regarding the legalization of marijuana in the United States continues to emerge as a pressing issue, the rates of simultaneous marijuana and alcohol consumption prior to driving are likely to rise. Research suggests that alcohol and marijuana consumed independently at low levels results in minimal impairment on driving performance. Conversely, driving performance is dramatically impaired when small amounts of marijuana and alcohol are simultaneously consumed. The current study investigated the impact of social stress on the perceived risk of Driving Under the Influence of Small Amounts of Marijuana and Alcohol (DUI-SAMA). In addition, the current study …

We Who Have Never Bled, Betty Frances Fisher

Open Access Theses & Dissertations

The poetry in We Who Have Never Bled explores landscapes of the personal and the mythic, centering women in a position of both traveler on and witness to this journey that is both violent and hopeful, both personal and universal.

Scalability Improvements To Nrlmol For Dft Calculations Of Large Molecules, Carlos Manuel Diaz

Open Access Theses & Dissertations

Advances in high performance computing (HPC) have provided a way to treat large, computationally demanding tasks using thousands of processors. With the development of more powerful HPC architectures, the need to create efficient and scalable code has grown more important. Electronic structure calculations are valuable in understanding experimental observations and are routinely used for new materials predictions. For the electronic structure calculations, the memory and computation time are proportional to the number of atoms. Memory requirements for these calculations scale as N2, where N is the number of atoms. While the recent advances in HPC offer platforms with large numbers …

Density Functional Study Of Reactivity And Regioselectivity Of H2o@C60, Govinda Bahadur Kc

Open Access Theses & Dissertations

The exohedral reactivity of endohedral fullerene has aroused significant interest because of its potential applications in biology, medicine and material science. The encapsulation of a single water molecule without any hydrogen bonding to other compounds, inside the hydrophobic environment of C60 is an intriguing topic to study about. In 2011, Kurotobi and Murata successfully synthesized H2O@C60 fullerene. The presence of a polar water molecule inside the cage is expected to cause changes in the exohedral reactivity of C60. In order to find out the impact of an entrapped single water molecule on the reactivity of C60 fullerene, we use density …

Removal Of Endocrine Disrupting Compounds From Water And Wastewater Using Ecofriendly Materials, Alma Lili Loya Posada

Open Access Theses & Dissertations

Endocrine disrupting chemicals (EDCs) are compounds considered pollutants of emerging concern. The United States Environmental Protection Agency (USEPA) defines emerging pollutants as new chemicals without regulatory status and with an impact on the environment and human health that is poorly understood. Bisphenol A (BPA) has been considered an EDC and found to be ubiquitous in the environment because of its presence in a multitude of products including food and beverage packaging, flame retardants, adhesives, building materials, electronic components, and paper coatings Currently, BPA is not regulated by the federal government in the US and waste water treatment plants are not …

Structure And Biological Activity Of A D3g Mutation In The Human Mitochondrial Chaperonin Hsp60, Jihui Li

Open Access Theses & Dissertations

Proteins are essential components in all cellular activities, including signal transduction, gene expression regulation, immune response, structural support and many others. Following their synThesis on the ribosome, proteins need to fold into their precise three-dimensional structure to obtain functionality. If they fold incorrectly they are prone to aggregation and cause a wide range of neurodegenerative diseases. Some proteins are capable of folding without assistance but others need help from protein complexes known as chaperonins. Chaperonins are a family of proteins that assemble into barrel-shaped cages the create a protected chamber for misfolded proteins to refold into their biologically active state. …

Validation Of An Error Sonification Auditory Feedback Training Program On Proper Sagittal Plane Squat Technique, Rena Hale

Open Access Theses & Dissertations

Osteoarthritis (OA) is one of the most common degenerative joint diseases that hinders an individual's quality of life. A large portion of knee OA instances can be correlated to previous anterior cruciate ligament (ACL) injury. Knee joint injury leading to OA is most prevalent in males aged 20-55 years old and can be caused by improper form during execution of a given task or lack of neuromuscular control. Screening protocols are used to assess deficits of an athlete, with the goal of reducing the risk of injury during both training and in competition. Neuromuscular training programs have been created to …

Box-Fusion: A Way To Enhance The Pairwise Testing Approach, Omar Ochoa

Open Access Theses & Dissertations

Critical software systems that have failed due to the software errors are well documented. As our dependency on computer-based systems increases and such systems become more complex, software verification becomes even more important. Enhancing and improving the verification and defect correction techniques used in software engineering for the development of software systems is of utmost importance to keep pace with our increasing reliance on software.

Pairwise testing has emerged as an effective technique for software system-level testing that have large combinations of inputs, although a drawback is the lack of support for defect location. This research aims to increase the …

Francisco's Flowers, Kristopher Andrew Paul

Open Access Theses & Dissertations

Francisco's Flowers is a collection of short stories, and flash fiction, where the character interaction leads into the next short story showing the interconnectedness of life and how our choices may end up affecting the lives of others.

Characterization Of A Medial Prefrontal Cortex - Caudal Pontine Reticular Nucleus Relevant To Sensorimotor Gating, Sebastian Andres Pace

Open Access Theses & Dissertations

Focusing attention depends on filtering irrelevant sensory stimuli to prevent brain overload. This ability of our brain to block or “gate” such information is a pre-attentive neuronal mechanism known as sensorimotor gating (SG). SG abnormalities have been linked to a variety of psychiatric disorders, including schizophrenia. Initial studies related to the SG circuitry were performed more than four decades ago (Graham, 1975). However, SG is still the subject of numerous current studies involving both humans and animal models. Despite these research efforts, knowledge gaps persist regarding the identity neurons involved, their locations in different brain regions and their precise functional …

Weakening Of The Affricate /T[Voiceless Postalveolar Fricative]/ In The Spanish Of Ciudad Juárez, Luis Alberto Méndez

Open Access Theses & Dissertations

A characteristic feature of the Spanish spoken in the Mexican state of Chihuahua is the pronunciation of the standard phoneme [t∫] (ch) as a non-standard allophone /∫/ (sh). The present study analyzes the social and linguistic factors that influence variation in the Mexico-United States border community of Ciudad Juárez. Direct and indirect elicitations techniques were used to gather tokens of /t?/ from a sample of 40 speakers who varied in age, sex, socioeconomic status, education level, and degree of bilingualism. The data was perceptually and acoustically interpreted and then examined using variable rules analysis. On the linguistic side, the results …

Investigation On Pyroelectric Ceramic Temperature Sensors For Energy System Applications, Md Rashedul Hasan Sarker

Open Access Theses & Dissertations

Temperature monitoring for energy generation systems plays an important role for control of overall safety and efficiency. To operate the energy system at optimum operating conditions, it is important to measure the real time temperature. Furthermore, harsh environment temperature sensing is desired since most sensors in energy systems are exposed to high temperature, high pressure, and corrosive environments. There is an increasing demand of wireless sensor networks and major interest in energy system applications for harsh environment and remote sensing applications. For this study, LiNbO3 and Pb(Zr0.52Ti0.48)O3 (PZT) pyroelectric ceramic materials were used to develop temperature with wired and wireless …

Music And What It Is Like: What A Phenomenology Of Perception Tells Us About The Experience Of Music, Chavah Schwartz

Open Access Theses & Dissertations

Ludwig van Beethoven's Symphony No. 9 in D minor, Op.125 is one of his most brilliant and influential musical compositions. However, at the time that he writes his Ninth Symphony, Beethoven is completely deaf. Beethoven exhibits a unique situation where his mind is unaffected in its ability to continue creating new music even though his body is effected in its ability to experience music. Theories of mind, like reductive physicalism and non-reductive dualism, offer a way of understanding Beethoven's conscious experiences of music in relation to physical or non-physical information about mental phenomena associated with conscious experience. Yet, these theories …

Convergence? The Incursion Of Technology In The United States - Mexico Remittance Corridor, Sam Wilner Simon

Open Access Theses & Dissertations

The United States-Mexico remittance corridor finds itself at a crossroads, exacerbated by an amalgam of factors including tapering migration levels, a more mature Mexican economy and higher levels of technological permeation. I identify the individual, governments and service providers as the three main actors in the United States - Mexico Remittance Corridor. I deploy an interdisciplinary set of sources, ranging from academic journals to World Bank datasets to illustrate the logistical hurdles that are delaying changes to what many experts believe, is an unsustainable status-quo. I explore the idea of a Galtung inspired mutually reinforcing triangle as a means of …

Digital Processes And Characterization For Fabricating 3d Rf Devices, Harvey Hing Tsang

Open Access Theses & Dissertations

In this work, co-planar waveguides (CPW) are fabricated and characterized with low temperature 3D printed materials for flexible electronic applications. Laser processing is introduced to reduce heating and cooling times for curing and subtractive manufacturing. CPWs are optimized by varying printing resolution, adjusting curing conditions and shaping conductor profile with a pico-laser. By using acrylonitrile butadiene styrene (ABS) as substrate material and Dupont CB028 as conductive material, a high S21 and low S11 CPW is fabricated. Optimized direct write methods are dispensed onto 3D complex structures to move away from 2.5D style printing and move into true 3D printed antenna …

A Case For Cooperation: How A Binational Agreement Between The U.S. And Mexico Can Alleviate The Rapid Drawdown Of The Mesilla And The Hueco Aquifer, William Lynch Vallee

Open Access Theses & Dissertations

This study examines ways to mitigate the depletion of the Hueco and the Mesilla aquifers in the Paso Del Norte region of the United States and Mexico through a binational legal agreement. By examining the history of cooperation and disagreement between the two nations and extrapolating from three case studies (The Nubian Sandstone Aquifer, The Mountain Aquifer, and The Guarani Aquifer) the research concludes that an agreement is indeed possible and lays out a plan to implement changes.

Bioavailability Of Metal/Metal Oxide Nanomaterials And Their Effects On The Physiology Of Plants, Nubia Zuverza Mena

Open Access Theses & Dissertations

Nanoparticles (NPs) contained in consumer products will undoubtedly reach the environment. Engineered nanomaterials (ENMs) may cause physiological and biochemical alterations in plants and, therefore, have noteworthy effects on their growth and proliferation. Edible plants are a means through which NPs can reach organisms of higher trophic levels that feed on them. Previous studies have demonstrated that there are strong interactions between NPs and terrestrial plants. This project intends to evaluate the impacts that various commercially available NPs have on plants. Copper (Cu) nanomaterials and conventional Cu compounds were compared in cilantro plants (Chapter 2). In addition, changes in radish sprouts …

Molecular Dynamics Proxy Applications For Optimizing Performance Of Simulations Under Extreme Conditions, Jayalath Abeywardhana Mudiyanselage Madawa Abeywardhana

Open Access Theses & Dissertations

Exascale performance of scientific application is a prominent goal for the scientific community and computer hardware vendors. As a result, several proxy applications for the widely used scientific codes have been developed with the purpose of testing performance, memory and power consumption issues associated with simulations at the exascale. Co-MD is a proxy application for classical Molecular Dynamics (MD) codes based on the (SPaSM) Los Alamos code.

This work comprises two different but related computational aspects: performance evaluation and optimization of Co-MD (Co-Design Molecular Dynamics) for different computer architectures/execution models, and direct application of SPaSM (Scalable Parallel Short-range Molecular Dynamics) …

Bio-Politics Of State Repression: A Case Study Of The Indignados Social Movement In Ciudad Juárez, México, Igi G. Acosta

Open Access Theses & Dissertations

Police repression has become one of the most widespread experiences of participating in social movements. This thesis provides a case study of how repression is experienced and how it affected the Indignados social movement in Ciudad Juárez, México. Specifically, it chronicles the circumstances around two separate repressive events that occurred on November 1, 2011. The thesis has two broad aims. First, it seeks to provide a sociological analysis of how state repression applied through structural and systematic use of police violence affected the political trajectory and lives of peaceful and non-violent activists from Ciudad Juárez. This highlights the violent reality …

Geophysical Constraints On The Hueco And Mesilla Bolsons: Structure And Geometry, Victor Manuel Avila

Open Access Theses & Dissertations

The Hueco and Mesilla Bolsons are part of the intramountain basins of the Rio Grande Rift system. These bolsons are the primary source of groundwater for the El Paso-Ciudad Juarez metropolitan area and contain faults that show evidence of repeated earthquakes during the Quaternary. The region is also associated with has low-level (M<4) seismicity. The collection and analysis of precision gravity data, coupled with information from water wells, multichannel analysis of surface waves (MASW) studies and previously published seismic reflection lines, have been used to examine the structure and faulting within these bolson. This study reveals that the Hueco and Mesilla Bolsons are very different structurally. The southern Mesilla Bolson contains about 500 m of sediment. Faults are difficult to trace and have less than 50-100 m of displacement across them. The southernmost bolson contains numerous Tertiary intrusions and the thickness of Cretaceous bedrock appears to decrease from south to north, possibly delineating the edge of Laramide age deformation within the bolson. The northern Hueco Bolson contains 1800 to 2500 m of basin fill. Displacement along the East Franklin Mountains fault (EFMF), a fault with evidence for repeated earthquakes within the past 64,000 years, is about 1500 m, and displacement on intrabasin faults is 200-300 m. Several intrabasin faults appear to control the saline to freshwater contact within the bolson. The EFMF may extend over 30 km south of the end of its mapped trace at the end of the Franklin Mountains and a number of intrabasin faults also extend south into the urbanized regions of the study area. The EFMF and other basin structures appear to be offset or disrupted at the speculated edge of Laramide deformation that lies beneath the bolson. Horizontal Gradient Methods (HGM) were applied to the gravity data and were successful for tracing faults and older Laramide features within the Hueco Bolson beneath the urbanized regions of the cities. HGM were not as successful at tracing faults within the Mesilla Bolson, however they were helpful for tracing the subsurface extent of igneous intrusions including the Mt. Cristo Rey, River, Three Sisters, and the Westerner outcrops. Some of these features appear linked at depth by a series of dikes and faults. MASW data were used to determine the average shear wave velocity in the upper 30m (Vs 30) at ~70 sites within the Hueco Bolson. These observations were combined with similar data collected previously in Juarez to produce regional velocity and site classification maps. The results show low velocities are found close to the river within fluvial deposits with higher velocities close to the Franklin Mountains where bedrock is close to the surface and higher velocities in upland regions of northeast El Paso were soils appear to be more highly cemented. These data will be used in conjunction with information on bolson geometries to model the expected effects of strong ground motion from earthquakes in the El Paso-Ciudad Juarez region.

Dielectric Prism Antenna, Jose Antonio Avila

Open Access Theses & Dissertations

3D printing is revolutionizing the development and manufacturing of devices. Currently multi-material 3D printing, like metals plus dielectrics, is in the early stages and not very accessible. This work set out to develop an all-dielectric antenna that could be 3D printed with current widely accessible 3D printing technologies. The antenna developed is an all-dielectric ultra-thin antenna with a simple geometry. The antenna radiates by using total internal reflection and a circulating mode operating as a leaky whispering gallery mode. We are calling the antenna the dielectric prism antenna because it acts like an optical prism. The dielectric prism antenna was …

Raising Ebenezer, Shannon Lee Bianco

Open Access Theses & Dissertations

Raising Ebenezer is an antropoesia collection representing the adoption story of a Christian family and their children from Uganda, Africa. Through poetry, essay, short story, flash fiction, and non-traditional genres, Raising Ebenezer investigates the culture of international adoption, love, fear, faith, loss, corruption and redemption. It is a work of creative non-fiction.

Estimating Air Pollution Concentrations Using Moves-Generated Site-Specific Traffic Emissions, Mayra Consuelo Chavez

Open Access Theses & Dissertations

The research presented here attempts to estimate air pollution concentrations using MOVES and site-specific traffic emissions particularly those emissions surrounding three different air-monitoring stations. The objectives of this research include using MOVES capability to conduct project-level analyses, choosing impact zones to create emissions inventories. Emissions inventories provided by the MOVES model for impact zones within the El Paso county area were used to identify a relationship between air monitoring stations' measured results and emission estimates from a project-level analysis. The research hopes to identify an optimum zone radius that can be used to compare MOVES estimates with air monitoring stations …

Mental Health Help-Seeking Intention And Organizational Climate In A Population Of Military Service Members, Mishaw Tyron Cuyler

Open Access Theses & Dissertations

Historically, psychological effects of war such as Post Traumatic Stress Disorder (PTSD) have been understated and misdiagnosed throughout the world. Military members that displayed symptoms of PTSD such as anxiety, depression, and sadness were thought to lack the strength and courage necessary to be a soldier. As a result, many soldiers suffering from symptoms of PTSD would suffer in silence and not seek the requisite help for mental health care. This Dissertation examines the mental health help-seeking intention of U.S. military service members using the Theory of Planned Behavior (TPB). Additionally, this Dissertation considers the effects that leadership support climate …