Digital Commons Network^™

Ethnic Disparities In The Reproductive And Sexual Health Screening Practices Of Ecuadorian Women, Ruth Castillo

Open Access Theses & Dissertations

Background: Evidence suggests that reproductive and other health disparities disproportionately affect Indigenous and Afro-Hispanic ethnic minority groups throughout the Latin American and Caribbean (LAC) region. Factors associated with reproductive health disparities in LAC countries include low social economic status (SES), poor health care access, racial and gender discrimination, machismo, health beliefs and low perceived risk for breast cancer, cervical cancer, sexual transmitted infections (STIs) and other conditions. Preventive measures such as health education and early screening is vital for disease prevention and detection. However, screening rates for breast cancer, cervical cancer, and STIs are lower in most LAC countries compared …

Libertad Perpetua, Jose Durango

Open Access Theses & Dissertations

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Identification Of Leishmania Spp. And T. Cruzi Parasites In Stray Felines In El Paso, Texas Through Polymerase Chain Reaction, Patricia Isabela Gonzalez

Open Access Theses & Dissertations

Chagas disease and leishmaniasis are considered neglected parasitic diseases, and although dogs are considered the main domestic reservoirs, infected cats have recently been found in endemic areas in several countries and became a public health concern. These diseases can be transmissible to other animals and are known to infect humans as well. Natural infection of cats by Leishmania spp. and Trypanosoma cruzi has been demonstrated in several European, Latin American, and Asian countries. A recent field study found dogs and wild animals tested positive for both Leishmania and Trypanosoma cruzi in the El Paso, Texas Region. Cats, however, have not …

Design And Analysis Of A Novel Latch System Implementing Fiber-Reinforced Composite Materials, Francisco Guevara

Open Access Theses & Dissertations

The use of fiber-reinforced composite materials have increased in the last four decades in high technology applications due to their exceptional mechanical properties and low weight. In the automotive industry carbon fiber have become popular exclusively in luxury cars because of its high cost. However, Carbon-glass hybrid composites offer an effective alternative to designers to implement fiber-reinforced composites into several conventional applications without a considerable price increase maintaining most of their mechanical properties. A door latch system is a complex mechanism that is under high loading conditions during car accidents such as side impacts and rollovers. Therefore, the Department of …

Novel Engineered Nanomaterials For Water Remediation And Gas Adsorption: Graphene Oxide And Carbon Nanotubes Decorated With Metal-Organic Frameworks And Magnetic Nanoparticles, Vahid Jabbari

Open Access Theses & Dissertations

In the current study, a series of novel magnetic and non-magnetic hybrid nanocomposites based on metal-organic frameworks (MOFs) of M3(BTC)2 (M: Ni, Cu, Zn, and Cd), graphene oxide (GrO), and carbon nanotubes (CNTs), and Fe3O4 magnetic nanoparticles (MNPs) were developed via a green, simple and versatile solvothermal method at which GrO and CNT were used as platform to grow the MOFs and Fe3O4 MNPs over them. The as-synthesized nanocomposites were characterized by XRD, SEM, TEM, XPS, IR, Raman, TGA, and N2 adsorption/desorption isotherms. Morphological analysis confirmed successful growth of nano-size Fe3O4 MNPs and M3(BTC)2 MOFs over GrO and CNT platforms. …

Effects Of Obesity On Slip-Related Falls Among Young Adults During Gait, Jae Eun Kim

Open Access Theses & Dissertations

Falls present serious medical, health, and societal challenges to not only the frail elderly or individuals with mobility disorders; but also the active and vigorous older adults. Slip-related falls account for about 40% of all falls among older adults. Individuals with obesity are subject to an elevated risk of falls associated with muscle weakness, abnormal body mass distribution, and postural instability. Dynamic gait stability has been identified as a key factor leading to falls after a slip during gait. Despite individuals with obesity suffer higher risk of falls compared to their lean counterparts, no study has investigated how the dynamic …

Towards Analytical Techniques For Optimizing Knowledge Acquisition, Processing, Propagation, And Use In Cyberinfrastructure, Leonardo Octavio Lerma

Open Access Theses & Dissertations

For many decades, there has been a continuous progress in science and engineering applications.

A large part of this progress comes from the new knowledge that researchers acquire, propagate, and use. This new knowledge has revolutionized many aspects of our life, from driving to communications to shopping.

Somewhat surprisingly, there is one area of human activity which is the least impacted by the modern technological progress: the very processes of acquiring, processing, and propagating information. When we decide where to place sensors, which algorithm to use for processing the data – we rely mostly on our own intuition and on …

A Cell Formation Algorithm For Sequential Processes With Alternative Machine Selection In The Automotive Lighting Industry, Victor Manuel Loya Garnica

Open Access Theses & Dissertations

At the present time, there are more than 12 big companies dedicated to design and produce OEM lighting systems for cars and trucks. The manufacturing processes for headlamps, tail lamps and any other exterior vehicle lighting are very common in the auto industry. Still, every automotive lamp assembly is different from brand to brand and even between the different vehicle models. Indeed, there are car headlamps with less than 30 sub-components and others with up to 300 elements. This implies creating diverse part numbers which share or hold varying manufacturing methods within a specific facility. Management of the plant resources …

Synthesis Of Benzofused-P-Indolequinones From 1,4-Naphthoquinone And Selective N-Debenzylation By Dess-Martin Periodinane, Quang Huynh Luu

Open Access Theses & Dissertations

p-Indolequinones are important heterocycles since they display interesting bioactivities such as anticancer activities as well as the ability to trigger drug release in drug targeting research. Additionally, they are also useful in precursors for the synThesis of bioactive compounds. Over decades, many methodologies have been investigated for the synThesis of p-indolequinones. Among those, cyclization of quinones plays an important role in convenient synThesis of these compounds. However, the great majority of these methods only describe quinones as electrophiles in cyclization. In our research, we found an intramolecular nucleophilic attack of quinone to an in-situ generated carbonyl group and developed a …

Does Low-Level Arsenic Exposure Predict Blood Pressure In Children?, Tania Angelica Mayorga

Open Access Theses & Dissertations

Background & Significance: Inorganic arsenic is a heavy metal naturally found in soil and human exposure to this heavy metal causes adverse effects. Exposure risks are particularly high in developing children. Arsenic is mainly found in bedrock. It is also a by-product of smelting, it is used in cement production, and historically is has been found in crop pesticides. Among other ill-effects, arsenic exposure in humans can cause respiratory diseases, peripheral neuropathy and liver fibrosis. In particular arsenic has been shown in many studies to be a contributing factor in the risk for hypertension in adults however no studies have …

High Performance Computing In Air Quality Models An Their Applications, Roberto A. Perea

Open Access Theses & Dissertations

High Performance Computing has become an important tool for many applications and services in the areas of Air Quality research. One important aspect is the use of computational technology in simulation and modeling of complex Air Quality models which makes it affordable in terms of data analysis, processing and speed. For this Dissertation, three projects using Air quality models were developed using high performance computing.

For the first project, ozone concentrations for the Paso del Norte Region are simulated using air quality models and compared against experimental data. For the second project, the Development of models and optimization of codes …

Associations Between Measures Of Obesity And Arterial Stiffness Of Young Hispanic Men, Maria Perez

Open Access Theses & Dissertations

Arterial stiffness and obesity are independent predictors of coronary heart disease and cardiovascular disease mortality; however, there is conflicting evidence for the association between arterial stiffness and obesity. Arterial stiffness research of young Hispanic males is limited. PURPOSE: To examine the association between measures of obesity and peripheral and aortic stiffness of young Hispanic men. METHODS: All data are expressed as mean ± SD. Participants were 23 non-obese (nOB; BMI 25.87±3.09 kg/m2) and 21 obese (OB: BMI 35.42±4.87 kg/m2) young Hispanic men (age range 18–25 years). Measures of obesity included body fat percentage, BMI, waist circumference, hip circumference, and waist-to-hip …

Question 1: Star Speeds; Question 2: Slurping Gasoline, Larry Weinstein

Physics Faculty Publications

One piece of evidence that the center of our galaxy contains a super-massive black hole came from measuring the speed of a star orbiting that black hole. What is the maximum speed of that star?

If instead of carrying their gas in fuel tanks, cars “slurped up” a stream of gas as they drove, how thick a stream of gas would each car need?

Question 1: Kill The K-Cup; Question 2: Water Cooling, Larry Weinstein

Physics Faculty Publications

According to KillTheKCup.org, single-use non-recyclable Keurig K-cups “are killing our planet.” How large is the environmental impact of K-Cups?

How much more cooling do you get from drinking cold rather than room-temperature water on a hot day? How much do you sweat per day when the ambient temperature is about 35 °C (95 °F)?

The Role Of Collaborative Ontology Development In The Knowledge Negotiation Process, Norma Rivera

Open Access Theses & Dissertations

Interdisciplinary research (IDR) collaboration can be defined as the process of integrating experts' knowledge, perspectives, and resources to advance scientific discovery. The flourishing of more complex research problems, together with the growth of scientific and technical knowledge has resulted in the need for researchers from diverse fields to provide different expertise and points of view to tackle these problems. These collaborations, however, introduce a new set of "culture" barriers as participating experts are trained to communicate in discipline-specific languages, theories, and research practices. We propose that building a common knowledge base for research using ontology development techniques can provide a …

Recession Prediction For Us Border Economies. Can Probit Models Predict Recessions At An Msa Level Including Bi-National Variables?, Elias Daniel Saenz

Open Access Theses & Dissertations

Economic recession prediction has received substantial attention in recent years. The topic is important. Unemployment, business bankruptcies, and personal bankruptcies all increase during business cycles downturns.

Identifying appropriate indicators for recessions is a difficult task. Other variables have been used in prior studies. These variables have included the term structure of the yield curve (Fama 1984; Mishkin 1988a) and the difference between the yields of long-run treasury bonds and short run treasury bills (yield curve) (Estrella and Mishkin 1996; Dueker 1997; Kauppi and Saikkonen 2008; Nyberg 2010).

Estrella and Mishkin (1998) compare the effectiveness of different economic variables that are …

Processing And Property Evaluation Of Tungsten-Based Mixed Oxides For Photovoltaics And Optoelectronics, Mirella Vargas

Open Access Theses & Dissertations

Tungsten Oxide (WO3) films and low-dimensional structures have proven to be promising candidates in the fields of photonics and electronics. WO3 is a well-established n-type semiconductor characterized by unique electrochromic behavior, an ideal optical band gap that permits transparency over a wide spectral range, and high chemical integrity. The plethora of diverse properties endow WO3 to be highly effective in applications related to electrochromism, gas sensing, and deriving economical energy. Compared to the bulk films, a materials system involving WO3 and a related species (elements or metal oxides) offer the opportunity to tailor the electrochromic response, and an overall enhancement …

Monolingual And Bilingual Intervention Outcomes In A Bilingual Child With Autism, Victoria Alexander

Open Access Theses & Dissertations

Background: When treating bilingual children with autism spectrum disorder (ASD), the language of intervention has been a controversial topic among professionals. There is limited research on the treatment of bilingual children with ASD.

Purpose: To extend the limited research on the use of language of intervention in bilingual children with ASD. This study compared a monolingual English treatment and a bilingual English-Spanish treatment, to examine which one was more efficient.

Methods: A single-subject alternating treatment design with a baseline was used to compare the efficacy of two treatment conditions in increasing language skills in a bilingual child with ASD. The …

Lithospheric Structure And Stress Field Orientations In The Northern Libya And East-Central Mediterranean Region, Abdusalam Ali Agail

Open Access Theses & Dissertations

This thesis is a combination of three studies including tomography using surface wave group velocities, stress orientations from focal mechanisms, and receiver functions. The study area covers northern Libya and the east central Mediterranean region. I utilized new data from the Libyan National Seismic Network to better understand the crustal thickness and stress orientation of northern Libya as well as the east central Mediterranean region. In the first study, I conducted surface wave group velocity tomography implementing the Gaussian beam method for obtaining 2-D velocity variations assuming an isotropic model. I constructed surface wave group velocity maps over a range …

Acoustic Emission Characteristics Of Damage Accumulation In Kevlar® 49 Composites, Eduardo Andrade

Open Access Theses & Dissertations

Acoustic emission (AE) data attained during tensile testing of epoxy impregnated Kevlar® 49 (K/Ep) composite strands were reduced and analyzed to monitor progressive damage accumulation during the approach to tensile failure. The K/Ep material tested in this study was chosen due to its similarity to the material-of-construction used in composite overwrapped pressure vessels (COPVs) used on the NASA Space Shuttle Orbiter. Insight into the progressive microstructural degradation of K/Ep strands was gained by monitoring AE event rate and energy. Source location based on energy attenuation and arrival time data was used to differentiate between significant AE attributable to microstructural damage …

Associativity Forcing Commutativity In Left Nil Rings, Md Al Masum Bhuiyan

Open Access Theses & Dissertations

Our study in this thesis is concentrated on the AFC groups (Associativity Forces Commutativity) and observing the ring structure there. We are looking for abelian groups yielding ring structures (K) where associativity forces commutativity. We call them K-AFC groups.

We consider that the only conditions put on a ring multiplication are the distributive laws over the additive group addition. After [1], We say that an abelian group (G, +) is an AFC-group if (i) there exists a nonassociative and noncommutative ring (G, +, ˙) and (ii) all associative rings (G, +, ˙) are commutative.

We call a ring left-nil if …

Examining The Effects Of Political Trust, Attribution Of Responsibility, And Media Framing On Public Support For Outside Intervention In The Mexican Drug War, Rodrigo Alberto Borunda

Open Access Theses & Dissertations

To what extent does the Mexican society support cooperation with foreign authorities to combat the drug cartels? Who does the Mexican society trust in combating the drug cartels? Employing survey data from the Roper Center along with original experimental data, I examine the determinants of public support for foreign cooperation to combat drug cartels. Focusing on different forms of the U.S.-Mexico cooperation, I explore which type and form of foreign intervention is most acceptable to the Mexican public. Specifically, I examine public support for the following forms of cooperation: training Mexican police and military personnel, providing money and weapons to …

The Sweet Taste Of Health: A Positive Deviance Inquiry Into Communicative Acts That Lead To Effective Management Of Diabetes Among Hispanics, Claudia Martinez Boyd

Open Access Theses & Dissertations

ABSTRACT

Diabetes is among the fastest growing diseases in the world. In the U.S., Hispanics are the third most affected population. Nonetheless, there are Hispanics diagnosed with diabetes who have, against all odds, found solutions to manage their disease. This study focused on the intrapersonal and interpersonal acts and behaviors of "positive deviant" Hispanics living on the U.S. - Mexico border that effectively managed their diabetes. They are referred to as "positive deviants" because they accrue "positive" outcomes and "deviants" because they are not the norm.

A PD inquiry was conducted and twelve PD respondents between the ages of 20 …

Behavioral And Electrophysiologic Performance In Participants With No Brain Damage Responding To Spoken Sentence Length Messages With Pauses Of Different Durations Inserted Withi The Spoken Message: A Pilot Study, Alexandrea Burciaga

Open Access Theses & Dissertations

Aim: The purpose of this pilot study was to examine the behavioral and electrophysiologic performance in two age groups of individuals with no history of brain damage responding to spoken sentence length messages with pauses of different durations inserted within the message with the use of Event-Related Potentials.

Pilot Study: A modified version of the Revised Token Test was used for the experimental task. All participants have not experienced any brain damage. The first group of adult participants consisted of three college age adults; ages 20-30 and the second consisted of three older adults, ages 50-60. Participants were randomly assigned …

Pathways To The Superintendency: Case Studies Of Hispanic Superintendents In Texas, Sandra Calzada

Open Access Theses & Dissertations

The purposes of this study were (a) to learn about the pathways to the superintendency for Hispanic superintendents in Texas and (b) to examine cultural issues encountered along the way. Collected data were compared to Scheinâ??s theory of organizational career mobility. A triangulation approach consisting of in-depth interviewing, survey completion, and observational data solicited information pertaining to their career development tracks, personal and career preparation, and incentives or disincentives to pursuing the superintendency. Participants were purposively selected from approximately 120 to 130 current Hispanic superintendents in Texas. The selected superintendents lead large districts (student enrollment exceeding 25,000) throughout various Texas …

Forecasting Water Demand In Phoenix, Juan Pedro Cardenas

Open Access Theses & Dissertations

Water utility planning efforts are supported by short-term water demand forecasts. This study applies a Linear Transfer Function (LTF) approach in order to model and forecast water demand for single-family residential, multi-family residential, and nonresidential customer categories in Phoenix, Arizona. Out-of-sample simulations of water demand, with a monthly frequency, are generated for periods when actual demand is known. Descriptive measures and two formal tests are utilized to analyze the accuracy of LTF projections against two random walk benchmarks. The price elasticities for the single-family residential, multi-family residential, and nonresidential usage categories are -0.36, -0.31, and -0.75, respectively. The descriptive accuracy …

Investigation Of The Natural Degradation Of Selected Endocrine Disrupting Compounds In Wastewater, Toni Carrick

Open Access Theses & Dissertations

Endocrine disrupting compounds (EDCs) are a class of compounds that are of concern for their potentially adverse effects on fish, wildlife, and humans. They can cause developmental and reproductive anomalies at concentrations in the low ppb to ppt levels. Studies have shown the primary route of exposure of EDCs within the environment is through the discharge of effluent wastewater. Removal efficiencies of wastewater treatment plants have been studied extensively, however, in rural or developing areas, which often lack secondary or tertiary wastewater treatment, little is known about the stability of these compounds and the rate at which they degrade in …

"What, To A Prisoner, Is The Fourth Of July?": Mumia Abu-Jamal And Contemporary Narratives Of Slavery, Luis Omar Ceniceros

Open Access Theses & Dissertations

Writing from a specifically Black postmodern perspective, former death row inmate Mumia Abu-Jamal composes his multimedia slave narrative as a postmodern Neo-slave narrative. From the Atlantic slave-trade to the United States prison-industrial complex, from Quobna Ottobah Cugoano to Mumia Abu-Jamal, the slave narrative exists as a critique against oppressive State powers and a collective affirmation of interiority and embodied significance. For Abu-Jamal, his incarceration is indicative of an ever-pervasive capitalist power-structure that in the past has, in the present is, and in the future will control designated groups of made marginalized masses in order that preeminent capitalist beneficiaries preserve elite …

Molecular Dynamics Study On Defect Reduction Strategies Towards The Fabrication Of High Performance Cd1-Xznxte/Cds Solar Cells, Jose Juan Chavez

Open Access Theses & Dissertations

Cadmium Telluride is a material widely used in terrestrial thin film photovoltaic applications due to its nearly ideal band gap (~1.5 eV) and high absorption coefficient. Due to its low manufacturing cost, this technology has the potential to become a significant energy resource if higher energy conversion efficiencies are achieved. However, the module efficiencies (~14%) are still far from the theoretical maximum (~30%) for this material in a single junction configuration. The reason behind this low performance is attributed to the high number of defects that are present within the device materials. The physics behind the formation mechanisms of these …

Understanding The Contractional History Of Surprise Canyon, California Through Digital Field Mapping, 3d Modeling, And U-Pb Zircon Geochronology, Joshua A. Cobb

Open Access Theses & Dissertations

Detailed digital mapping of lower-middle Surprise Canyon has revealed a more complex structure than previously interpreted. Rock units derived from the metamorphosed equivalents of the Pahrump Group exposed in Surprise Canyon display juxtapositions inconsistent with stratigraphic variations suggested in previous studies. This study proposes a contractional history of the central Panamint Mountains defined by two kinematically distinct and geochronologically constrained deformation events. D1 is characterized by a shallow dipping, NNW striking L and LS tectonite fabric ubiquitously observed in all metasedimentary and basement units. F1 folds are mesoscopic in scale and isoclinal with an axial planar S1 foliation. A prominent …