Digital Commons Network^™

Evaluation Of Point Of Use Drinking Water Treatment Systems For Colonias In The Southwest United States, Isaac Campos Flores

Open Access Theses & Dissertations

Clean drinking water is often taken for granted in first world countries, such as the United States. However, thousands of colonias residents (settlements in the Southwest US that lack access to basic infrastructure) still lack access to clean drinking water. Such is the case in the Paso Del Norte Region. In Doña Ana County, NM, and El Paso County, TX, colonia residents typically rely on shallow domestic wells and hauled water, respectively. However, both water sources can pose health concerns from elevated total dissolved solids and microbiological contamination. With connection to centralized water treatment and distribution still years away, colonias …

Reinterpretation Of The Mesozoic Thrust Complex Of The Southern Spring Mountains, Nevada, Warren Harding Allen

Open Access Theses & Dissertations

The east verging Keystone thrust fault in the southern Spring Mountains west of Goodsprings, Nevada, is mapped with a sharp bend in its trace near Keystone Wash. This bend was previously explained in the context of out-of-sequence thrusting and a salient-recess relationship along the thrust system; a simple redirection of the Keystone thrust to a north verging thrust. Recent geochronological studies indicate that the east verging Keystone thrust to the north of Keystone Wash formed between 83-103Ma. Approximately 5 kilometers to the east a north verging branch of the fault system overlies rocks as young as 99Ma. At the location …

Health And Stress Symptoms In University Professors And Their Relationship With The Process Of Obtaining A Permanent Position, Irene Concepcion Carrillo-Saucedo

Open Access Theses & Dissertations

This research study used a quantitative, correlational method to examine health and stress symptoms in university professors and their relationship with the process of obtaining a permanent position and participation in a merit pay program. The Stress Profile Inventory (PEN) was used to measure professors’ health habits, social support network, Type A behavior, cognitive hardiness, coping styles and psychological well-being. An original measure with a Likert-type scale was used to measure health status. The questionnaires were distributed to 104 professors from the Universidad Autónoma de Ciudad Juárez (UACJ) who provided voluntary participation. Based on the results of the study, certain …

Aerosol Physical And Chemical Properties Over Tropical Atlantic Ocean, Elsa Castillo

Open Access Theses & Dissertations

The atmospheric aerosol mass size distributions, modal characteristics, and a comparative analysis of the characteristic of PM2.5 versus trace gases: CO, O3, and SO2 over tropical Atlantic Ocean have been evaluated for Nov-Dec 2013. This study took place during the IX AEROSE expedition while the National Oceanic and Atmospheric Administration (NOAA) research vessel Ronald H. Brown traveled south along 23°W between 3°N and 5°S.

Aerosol mass size distributions were measured directly with a California Instruments Model PC-2H Quartz Crystal Microbalance (QCM). The corresponding values of average mass for accumulation, nuclei and coarse mode obtained were: 0.00124±0.00077, 0.00506±0.00254, and 0.00176±0.00114 μg/m …

Short-Term Forecasting Analysis Of Municipal Water Demand In El Paso, Texas, Alejandro Ceballos

Open Access Theses & Dissertations

Short-term water demand forecasts inform decisions regarding budgeting, rate design, water supply system operations, and effective implementation of conservation policies. This study develops a Linear Transfer Function (LTF) forecasting model for El Paso, Texas, a growing city located in the desert Southwest region of the United States. The model is used to generate monthly-frequency out-of-sample simulations of water demand for periods when actual demand is known. To measure the accuracy of the LTF projections against viable alternatives, a set of benchmark forecasts is also developed. Both descriptive accuracy metrics and formal statistical tests are used to analyze predictive performance. The …

Low Level Lead Exposure And Inflammatory Markers In The Brains Of C57bl/6j Mice, Miguel A. Cervantes

Open Access Theses & Dissertations

Background and Significance: Prior studies have indicated that early chronic low-level lead exposure may be associated with adverse effects on motor and cognitive functions. The mechanisms by which low-level lead affects brain function are unknown. Objectives: The current study aimed to (1) determine whether early chronic low-level lead exposure altered the expression of pro- or ant-inflammatory cytokines and markers of oxidative stress in mouse brain studied at two ages, pre-adolescence (PND 28) and early adulthood (PND 40); and (2) in the same pre-adolescent and early adulthood mice, compare and contrast the levels of pro- or ant-inflammatory markers in three brain …

Novel Endohedral Derivatives Of Sc3n@C2n (N = 34, 40) And Unique Tether Controlled Bis-Functionalization Of Fullerenes, Maira Raquel Ceron Hernandez

Open Access Theses & Dissertations

Since the discovery of fullerenes in 1985, their exohedral functionalization has been necessary to increase their solubility and explore their properties and potential applications in materials science and medicinal chemistry. This Thesis provides a short overview of the importance of electronic, size and shape complementarity in determining the structures of specific endohedral fullerene compounds. This is followed by a description of a new method for the separation of scandium nitride endohedral fullerenes Sc3N@C2n (n = 34, 39 and 40), and their monofunctionalization.

We also present the regioselective synThesis of easily isolable bis-derivatives of C60, C70, and M3N@Ih-C80 (M = Sc, …

At The Intersection Of Deferred Action For Childhood Arrivals, The Migration Trust Network And Labor, Mario Javier Chavez

Open Access Theses & Dissertations

This study unpacks the intersection of Deferred Action for Childhood Arrivals, the Migration Trust Network and Labor. I use 9 in-depth qualitative interviews to address how such policies are affecting the labor acquisition and labor outcomes of DACA recipients. The Migrant trust network remained important for DACA recipients, although in a more indirect and macro-level way than described in Flores-Yeffal (2013). In particular, DACA recipients relied on the collective efficacy embedded within the community to facilitate their job search. Additional, migrant trust networks function differently according to the DACA recipients' level of education, but to fully benefit from the advantages …

Study Of A Directly Heated Oxy-Fuel Supercritical Power Generation System, A S M Arifur Rahim Chowdhury

Open Access Theses & Dissertations

The Directly heated supercritical oxy-fuel gas turbines have the potential to become an important addition to current power generation systems. They provide a higher thermal efficiency and more effective carbon capture techniques than existing gas turbines. Due to the higher density of the working fluids, the turbomachinery size in these systems can be reduced significantly; this will facilitate to minimize the operational cost. To achieve supercritical working fluid at the turbine inlet combustion needs to be conducted under enormous amounts of pressure; these values are is about 10 times those found in the present gas turbines. Additionally, existing material operational …

The Impacts Of Health Status And Exposure To Environmental Toxins On Children's Grade Point Average In El Paso, Texas, Stephanie Elizabeth Clark

Open Access Theses & Dissertations

Studies in the US have found that both exposure to environmental toxins and children's general health status negatively impact children's academic achievement. This Thesis will be made of up two papers. The first examines the impact of exposure to residential air toxins from a variety of sources on student's academic achievement and the second paper incorporates a measure of children's general health status into the statistical model from the first paper. This Thesis employs National Air Toxics Assessment (NATA) risk estimates from a variety of sources and individual-level data collected through a mail survey of fourth and fifth grade school …

Characterization Of Kendex® 0834 (Heavy Resins) & Kendex® 0897 (Light Resins), Victor Correa

Open Access Theses & Dissertations

Characterization of crude oil and some of its refined products has always been a challenge in the refining industry. This is mainly due to the high molecular complexity of crude oil. In this research, Heavy and Light Resins extracted from Penn Grade crude oil were analyzed with a wide variety of techniques, ranging from X-Ray Diffraction, Electron Microscopy, Fourier Transformed Infrared, C-13 Nuclear Magnetic Resonance, and chromatographic methods. An asphaltene extraction protocol was performed on both products. Only the Heavy Resin sample yielded a low amount of asphaltene. Results show that both Resins have a high degree of carbon branching, …

Parental Perception On The Impact Of Continued Use Of Baby Sign On Stress And Parent-Child Interaction: Follow-Up Survey One Year Post Hoc Of A Baby Sign Workshop, Brenda G. Compean

Open Access Theses & Dissertations

Introduction: Past research has indicated that teaching baby sign language to infants can be stressful for parents. Thus, a previous study to test this assertion was conducted. A baby sign workshop was conducted and consisted of teaching the parents approximately 200 signs and information on implementation. Results indicated that parents did not report stress as a result of using baby sign with their children. The current case study administered a modified version of the baby sign workshop survey one year post hoc. Purpose: To observe continued use of baby sign, as well as parental perception of the impact of baby …

Serine Palmitoyltransferase And Giardial Encystation, Monica Delgado

Open Access Theses & Dissertations

Giardia lamblia is a flagellated protozoan parasite responsible for chronic diarrheal disease in humans and animals. Giardia has minimal lipid synThesis machinery and the majority of its lipids are obtained from the small intestine of humans where the trophozoites colonize. Recent results from our laboratory indicate that sphingolipids (SLs) are also important for Giardia and they regulate encystation and cyst production. Only five SL genes are present in this parasite and they are differentially regulated during encystation. In my studies, I found that giardial serine palmitoyltransferase (gSPT) activity is upregulated in encysting cells, suggesting it might play an important role …

Structural Organization Of The Connections Between Neurons Of The Paraventricular And Lateral Hypothalamic Regions In The Adult Male Rat, Berenise De Haro

Open Access Theses & Dissertations

The hypothalamus is a major integrator of homeostatic signals in the brain; within the hypothalamus, there are sub-regions with specific roles in regulating energy balance. For example, the lateral hypothalamic area (LHA) has been classically associated with feeding behaviors, and contains two major orexigenic cell populations expressing the neuropeptides melanin concentrating hormone (MCH) or hypocretin 1/orexin A (H/O). Similarly, the paraventricular nucleus of the hypothalamus (PVH) integrates information to mediate neuroendocrine and autonomic responses related to ingestive behaviors. The PVH has also been implicated directly in the control of feeding. However, the precise structural and functional interactions between these two …

Convergence And Persistence In Corporate Law And Governance, Jeffrey N. Gordon

Faculty Scholarship

This chapter discusses the question of “convergence or persistence” in corporate law and governance. It first considers efforts to measure convergence directly by focusing on the evolution of law-on-the-books governance provisions before analyzing capital market evidence on convergence, with particular emphasis on capital market indicators such as the decline in “cross-listings” onto US stock exchanges by firms from jurisdictions with weaker investor protection and the increase in initial public offerings (IPOs) on emerging market stock markets. The chapter proceeds by reviewing evidence of divergence, especially “divergence within convergence,” and the failure of the European Union to produce more convergent corporate …

La Lutte Pour L'Azawad: Mnla Public Relations Responses To Conflict In Northern Mali, 2011-2014, Sean Neil Curtis

Open Access Theses & Dissertations

This Thesis examines the Internet public relations content of Mali's Tuareg rebel group, the Mouvement National de la Liberation de L'Azawad (MNLA). Content analysis grounded in speech act securitization theory is applied to the 259 posts on the MNLA's primary French language website in order to determine if MNLA website posts correlate with the events occurring in the northern Mali conflict. The data reveals that various characteristics of MNLA statements do correlate with events in the conflict. What the MNLA says provides important insight into the organization and the conflict itself. The identified correlations allow for MNLA rhetoric and activity …

Numerical Study Of The Supercritical Solution Of The Stationary Forced Korteweg-De Vries (Sfkdv) Equation, Sumi Dey

Open Access Theses & Dissertations

The time independent surface waves on a two dimensional incompressible and inviscid fluid flow passing over a bump on a flat bottom are considered. The stationary forced Korteweg-de Vries (fKdV) equation is defined in an unbounded interval. In this project, this unbounded interval is considered as three parts - on the bump, left hand side of the bump and right hand side of the bump. Exact boundary conditions are applied to the end points of the bump. All the possible combination of boundary conditions are used. A numerical approach is proposed to find the solitary wave solutions of fKdV equation …

Interpretation, Jamal Greene

Faculty Scholarship

Interpretation is the means by which the Constitution and its clauses are brought to bear on actual cases and controversies. Although much of the Constitution appears self-explanatory, as with its requirement that the president be at least thirty-five years old, much is subject to reasonable disagreement. The approaches to interpretation that form this chapter’s subject are the main tools scholars and judges have developed to resolve that disagreement. Those tools encompass five domains of argumentation, broadly conceived: text, history, structure, precedent, and consequences. As a general matter, interpretation that draws on resources wholly outside these five domains — via an …

Development Of Rigorous Electromagnetic Simulation Tools For Anisotropic Structures, Jose Luis Enriquez

Open Access Theses & Dissertations

Many times, mankind's creative nature has pushed the envelope beyond what was deemed physically possible at the time. People have engineered ways for us to fly, communicate across the globe in seconds, landed on the moon, and more recently discovered ways to make an object invisible. Unfortunately, there are times that this creativeness is hindered by funding, access to required tools or a combination of both. While this work cannot provide funding, it does provide a tool that one could use to model and simulate a variety of media. The media can vary from devices already being implemented to more …

Una Fosa Para Ana María, Diana V. Esparza Lara

Open Access Theses & Dissertations

No abstract provided.

Quantifying Weathering Rates On Tropical Volcanic Basse-Terre Island, French Guadeloupe: Insights From U-Series Isotopes In Weathering Rinds, Jacqueline Engel

Open Access Theses & Dissertations

Weathering of volcanic rocks plays many important roles at Earth’s surface such as modifying landscapes, providing nutrients to soil, and regulating atmospheric CO2. U-series isotopes (e.g. 238U-234U-230Th and 232Th) have been established as a chronometer used to constrain the formation rates of weathering rinds in tropical island environments. Here, U-series isotopes and major element concentrations were analyzed in two basaltic-andesite weathering rinds collected from the Deshaies watershed located in the northern, relatively dry (mean annual precipitation (MAP) = 1800 mm) region of tropical Basse-Terre Island, Guadeloupe. The two clasts are referred to as clasts AN-14-7.5 and AN-14-7.6. Elemental mobility trends …

#Blacklivesmatter: The Investigation Of Twitter As A Site Of Agency In Social Movements, Joseph Lawrence Flores

Open Access Theses & Dissertations

As an extension of mediated communication practices, social media sites have continued to increase the complexities of understanding how they not only affect the real world, but how they continue to effect communication practices in general. Due to the fact that social media sites exist as a mass mediated platform with high amounts of interpersonal communication elements, social media has become an important object of research when understanding how they can provide voice and agency to those who exist outside of traditional media power structures. By observing events in Ferguson, Missouri and Baltimore, Maryland involving police and unarmed civilians, activists, …

Depositional Facies And Interpretation Of Salt-Sediment Interaction In The Lower Triassic Moenkopi Formation Adjacent To The Castle Valley Salt Wall, Paradox Basin, Utah, Ann Marie Foster

Open Access Theses & Dissertations

Stratigraphic, sedimentologic and compositional data collected from the Triassic Moenkopi Formation adjacent to the Castle Valley salt anticline, Paradox Basin, Utah indicate passive diapirism of the salt wall with well-developed topography and exposed salt during the Early Triassic. Moenkopi strata thin to 150m on to the Castle Valley salt anticline and thicken to an estimated 275m away from it, indicating control of sedimentation by salt-generated topography. The distribution of nine terrestrial facies assemblages within Moenkopi Formation strata on the margins of Castle Valley Salt Wall, in combination with identification of three halokinetic sequences interpreted from stratal architecture adjacent to the …

An Assessment Of The Role Of Roads In Population Demography And Genetic Structuring In Two Species Of Lizards In The Northern Chihuahuan Desert, Kevin Floyd

Open Access Theses & Dissertations

Roads can fragment habitat and increase mortality rates of wildlife, potentially reducing population sizes and gene flow, which in turn can reduce genetic diversity through genetic drift. Although negative road impacts have been found in a variety of taxa, not all species are impacted. For instance, species that move less and rarely encounter roads and those that avoid the roads are predicted to not be negatively affected. Yet tests of these predictions are uncommon, especially for reptiles and particularly lizards. Side-blotched lizards (Uta stansburiana) are small sit-and-wait predators, while the larger marbled whiptails (Aspidoscelis marmorata) are active foragers. Their responses …

Irb Licensing, Philip A. Hamburger

Faculty Scholarship

This chapter examines conflicting norms in the government's licensing of speech and the press on “human-subjects research” through institutional review boards (IRBs). It begins by discussing licensing and why the prohibition of it is so fundamental and prroceeds by providing an overview of the structure of institutional review board licensing. It then highlights the unconstitutionality of IRB laws, arguing that the use of IRBs violates the principles of academic freedom. It asserts that licensing of speech or the press was a method of controlling the press employed by the Inquisition and the Star Chamber, and the First Amendment unequivocally barred …

Ecological Features Of The Greater Earless Lizard, Cophosaurus Texanus, (Squamata: Phrynosomatidae) On Indio Mountains Research Station, Hudspeth County, Texas, Gabriela Franco

Open Access Theses & Dissertations

626 Cophosaurus texanus were captured on regular trips to Indio Mountains Research Station in Hudspeth County, Texas from August 2010 to November 2014. Mark-recapture methods using 81 pitfall traps and toe-clips for identification allowed for analyses of long-term trends. 291 adult females, 315 males, and 20 unsexed juveniles were recorded. A total of 180 independent recapture events were documented over the study period (44% females; 55% males). The greatest numbers of C. texanus were collected in 2011 (234), which was also the driest year of the four (6.77 cm), whereas 2014 was the wettest (34.95 cm), but had the second-most …

Dual Language K-2 Latina Teachers: Juxtaposing Linguistic Identities And Pedagogical Practices On The U.S.-Mexico Frontera, Brenda Oriana Fuentes

Open Access Theses & Dissertations

This ethnographic study explored the linguistic identities and pedagogical practices of Latina bilingual-certified K-2 teachers in a dual language (DL) program in the U.S.-Mexico border area. Drawing on sociocultural theory, methods of data collection and analysis focused on linking DL Latina teachers' identity formation with both their conceptions of teaching and their actual pedagogical practices related to language use. The findings from this study painted a portrait of how DL teachersâ?? languages, literacies, and identities intertwined to shape their pedagogical practice. The linguistic backgrounds of DL teachers on the border were shaped by country of origin and languages, schooling experiences, …

Characterization Of The Nodamura Virus Rna Dependent Rna Polymerase And Formation Of Rna Replication Complexes In Mammalian Cells, Vincent Ulysses Gant

Open Access Theses & Dissertations

Positive-strand RNA viruses amplify their genomes in membrane-bound structures associated with intracellular membranes and organelles called replication complexes (RCs). Here, we begin to elucidate mechanisms of Nodamura virus (NoV; family Nodaviridae) RC assembly. The literature reports that NoV-infected muscle tissue exhibits mitochondrial aggregation and rearrangement of mitochondrial structure, leading to disorganization of the muscle fibrils. However, the molecular basis for this pathogenesis and the role of mitochondria in NoV infection remained unclear until now. We tested the hypoThesis that NoV establishes RCs in association with mitochondria in cultured mammalian cells at physiological temperature. We used immunofluorescence confocal microscopy and biochemical …

Simulations Of The Effects Of Temperature And Plasma In Carbide Processing, Alejandro Garcia

Open Access Theses & Dissertations

The transient surface temperature of particles within a packed bed was simulated to enable ultimately the prediction of plasma-surface reactions at ultrahigh temperatures. The motivation for the present study was along two fronts - the reactive infusion of liquid alloys at ultrahigh temperatures to process metal matrix or ceramic matrix composites and the plasma processing of materials to spike the surface temperatures to enable the formation of protective oxidizing scales on ultrahigh ceramic composites. The transient temperature simulations determined that a graphite crucible containing B4C spherical particles heated from 298 to 2128 K and 2504 K occurred in about 900 …

Differences In Stress Biomarkers In Women With High And Low Stress Appraisal, Clarissa Sara Gomez

Open Access Theses & Dissertations

Measures of physiological biomarkers have been widely used in the field of stress research to explain how stress negatively impacts health outcomes. Women in particular have been shown to be more at risk for developing physiological and psychological stress-induced conditions (e.g., hypertension, depression) due to hormonal differences (Kirschbaum et al., 1992), but more importantly, because of their appraisal of stressful events (Schamus et al., 2008). Few studies however have examined whether womenâ??s stress appraisal is predictive of stress reactivity, as measured by stress biomarkers, during stressful events. The goal of this study was to examine whether stress appraisal predicted stress …