Digital Commons Network^™

Implications Of Surface Runoff Recharge In Semi-Arid Regions On Groundwater Sustainability, Omar M. Al-Qudah

Open Access Theses & Dissertations

Amargosa Desert, Nevada regional groundwater studies show that the surface runoff infiltration occurring in the arroyos following runoff producing storms, and this infiltration is considered to be a major source of groundwater recharge. Groundwater infiltration through alluvium was investigated in the Amargosa Desert using borehole drill cuttings, groundwater chemistry, and applying a novel method for collecting runoff water. The sampling process included sediment, precipitation, and runoff water. In total, 176 runoff, 182 sediment, and 45 precipitation samples were collected between January, 2009 and January, 2011.Water chemistry, chloride concentrations, and stable isotopes of water collected from specially designed runoff samplers, placed …

Phylogeography Of Northern Populations Of The Black-Tailed Rattlesnake (Crotalus Molossus Baird And Girard, 1853) With The Revalidation Of C. Ornatus Hallowell, 1854, Christopher Anderson

Open Access Theses & Dissertations

The black-tailed rattlesnake (Crotalus molossus Baird and Girard, 1853) is a wide-ranging species complex with representatives from the southwestern United States through the highlands of central and southern Mexico. The systematics of this group has received little attention and in the past six decades only two taxonomic revisions have been proposed (the transfer of C. basiliscus oaxacus to C. molossus and the elevation of C. m. estebanensis to full species). However, a recent revision of the Neotropical rattlesnakes (C. durissus and C. simus) recovered a polyphyletic C. molossus. Sequenced data were obtained from three mitochondrial genes …

The Impact Of Training On Mentor And Student Teachers' Self Efficacy In Physical Education, Ana Lilia Cisneros

Open Access Theses & Dissertations

Providing support from an experienced teacher through mentoring has been as one way to reform teaching and teacher education. To keep talented beginning teachers in the profession, more than 30 states have implemented some form of mentoring program for novice teacher assistance. The purpose of this study was to investigate the impact of formal training on mentor and student teachers' self-efficacy in physical education. The study included eight mentors and seven student teachers in the experimental group receiving training. Three mentor and three student teachers were part of the control group and received no training. All results indicated the mentor …

Prediction Of Ribonucleic Acid Secondary Structures Using A Heuristic Backtracking Search, Christopher Roman Cuellar

Open Access Theses & Dissertations

Ribonucleic acid (RNA) is essential for all forms of life. RNA is made up of a large chain of nucleotide bases: Guanine (G), Uracil (U), Cytosine (C), and Adenine (A). An RNA strand can fold on itself to allow G-C, A-U, and G-U bases to form hydrogen bonds, this is known as a secondary structure. Knowing the secondary structure of an RNA chain is very important because it will allow researchers to better understand its specific functions. RNA will create secondary structures that tend to minimize their free energy. RNA secondary structure prediction is the attempt to predict physical folding …

Influence Of Orography On The Weather Patterns And Water Availability Of A Topographically Complex Chihuahuan Desert Region, Fernanda De La Cerda Camargo

Open Access Theses & Dissertations

Arid and semi-arid ecosystems cover a large extent of the planet's land surface and are highly susceptible to/and dependent on resource availability patterns, especially precipitation. Topography affects large scale weather patterns and redistributes precipitation which creates a variety of microclimates in complex landscapes; how these patterns are modified, however, is still not fully understood. Climate change models for arid and semi-arid ecosystems predict a change towards more extreme precipitation events; understanding the mechanisms involved in redistributing precipitation is crucial for the protection of these areas. Indio Mountains Research Station (IMRS) is located in the northern Chihuahuan Desert and seems to …

Enterprise Transformation Through A Zachman-Bayesian Framework To Improve Efficiency & Productivity, Ramakanth Gona

Open Access Theses & Dissertations

Although organizations are aware of the benefits of enterprise architectures models, organizations have difficulties determining deficiencies in their business architecture. Organizational assessment tools often do not achieve expectations as sold to management. Performance measures often fail to properly represent necessary holistic measurements. Methods for capturing deficiencies in current business models and deterring improvements to optimize business processes are rare. This thesis develops a new experimental architecture modeling approach for enterprise transformations. The approach is efficient in capturing deficiencies and finding correlations which can become targeted goals for improvements. The Zachman enterprise architecture framework provides a holistic view of organizational models …

Optimal Control Applied To A Discrete Time Influenza Model, Paula Andrea Gonzalez Parra

Open Access Theses & Dissertations

For the last decades, mathematical epidemiological models have been used to understand the dynamics of infectious diseases and guide public health policy.

In particular, several continuous models have been considered to study influenza outbreaks and their controls policies. However, most epidemiological data is discrete; therefore, a discrete formulation is more convenient to compare collected data with the output of the model. We introduce a discrete time model in order to study optimal control strategies for influenza transmission.

In our model, we divide the population into four classes: susceptible, infectious, treated, and recovered individuals.

In particular, we evaluate the potential effect …

Monitoring Ecosystem Dynamics In An Arctic Tundra Ecosystem Using Hyperspectral Reflectance And A Robotic Tram System, Santonu Goswami

Open Access Theses & Dissertations

Global change, which includes climate change and the impacts of human disturbance, is altering the provision and sustainability of ecosystem goods and services. These changes have the capacity to initiate cascading affects and complex feedbacks through physical, biological and human subsystems and interactions between them. Understanding the future state of the earth system requires improved knowledge of ecosystem dynamics and long term observations of how these are being impacted by global change. Improving remote sensing methods is essential for such advancement because satellite remote sensing is the only means by which landscape to continental-scale change can be observed.

The Arctic …

Development Of A New Evolutionary Algorithm Based On Adaptive Echolocation Applied To A Multi Objective Version Of The Redundancy Allocation Problem, Karla Rocio Gutierrez

Open Access Theses & Dissertations

The intention of this research is to develop a new algorithm that it is mainly focus in the principle of echolocation or also called biosonar. This principle is active in many animals such as: birds, shrews, dolphins and bats, these last ones are going to be a fundamental part of our study. These animals use it as radar in order to find food, obstacles or just to locate objects.

These animals use ultrasound beams with a certain degree of angle and multiple receivers; such as the two ears that are located slightly apart, so at the time of the returning …

A Reduced Order Parameter Estimation Technique Using Orthonormal Wavelets, Miguel Hernandez Iv

Open Access Theses & Dissertations

In this work we introduce methods for model order reduction using orthonormal wavelets. Specifically, we propose techniques and algorithms for wavelet-based reduced order parameter estimation using orthonormal wavelets for solving nonlinear least squares problems. Approaches for parameter reduction using the one dimensional and two dimensional wavelet transforms are presented using multiple levels of decomposition.

The performance of wavelet-based reduced order parameter estimation is tested using a suite of orthonormal wavelets on a groundwater hydraulics model provided by the U.S. Army Corps of Engineers. Using the hydraulics model, the goal is to find a least-squares solution of the permeability field given …

Evidence Of Ancient Rifts Beneath Texas, Keisuke Irie

Open Access Theses & Dissertations

Continental rifts are defined as geological features where Earth's lithosphere is pulled away by surface expansion of the Earth. Their physiographic features include linear rift valleys associated with active volcanism. Many rifts fail to split a continent and ancient rifts that failed to split can be found by using seismic waves to image these ancient structures. Using seismic data collected by EarthScope USArray stations in Texas, teleseismic receiver functions was calculated and utilized surface wave dispersion curves to simultaneously invert for the 2D velocity structure beneath each seismic station. EarthScope is a scientific program funded by NSF that provides geophysical …

A Picture Is Worth A Thousand Words: Integrating Sequential Narratives Into An English Language Learner's Curriculum, Cira Michelle Montoya

Open Access Theses & Dissertations

The following thesis aims to explore the subject of using comics in the classroom, particularly with English Language Learner (ELL) students. Do the images, vocabulary, and contextual cues found within comics and graphic novels positively affect language comprehension and writing skills of ELL students when these texts are integrated into a tailored curriculum? Within my research I have composed an extensive literature review comprised of two major sections. The first section aims to highlight the use of comics to assist struggling readers, again focusing on ELL students. The second section compiles a list of comics and graphic novels I reviewed …

Alcohol Production And Consumption Throughout U.S. History, And More Particularly In El Paso, Texas, As It Relates To Social Norms Theory, Jennifer Matthews

Open Access Theses & Dissertations

This thesis traces the history of alcohol production and consumption throughout U.S. history by following the course of the four major periods of relative equilibrium in social norms that the country has experienced. It uses this socio-historiography as a platform to understand how national trends in alcohol production and consumption were experienced along the border in El Paso, Texas, in a very unique fashion. The thesis aspires to augment El Paso's pride and sense of identity by building on knowledge of local history, customs, and norms.

Exploring Organizational Culture And Leadership Styles In El Paso Nonprofit Organizations, Milena Murta

Open Access Theses & Dissertations

This study focuses on two non-profit organizations in the El Paso region to document the communication processes by which they maintain their culture across their units. The study also explores leadership styles, both what are they and how they are employed in these organizations. This study involves three research methods, including: content analysis of organizational documents, interviews with leaders, and ethnographic observation. The findings of this study suggest that managing non-profit organizations is a challenge but yet rewarding duty. Moreover, managers explained that mission management is facilitated through four major ways: through documents, through the delivery of services, through training …

Gender Differences In Food Habits, Beliefs, And Fast Food Consumption Among A Predominantly Hispanic College Student Population, Alma Xochitl Ortega Gomez

Open Access Theses & Dissertations

Fast food consumption in the United States (U.S.) has been increasing steadily during the last decades. This trend has been linked to the increased prevalence of overweight and obesity among the population (Barnard, 2010; Currie, Della Vigna, Moretti & Pathania, 2009). Several sociodemographic characteristics that have been associated with the likelihood of frequent fast food consumption include income, ethnicity, gender and age (Block, Scribner, DeSalvo, 2004; Bowman & Vinyard, 2004; Drewnoski & Darmon, 2005; Driskell et al., 2006; Morse & Diskell, 2009; Paeratakul et al., 2003). Most studies related to fast food consumption have been conducted in adult population, only …

Fold-Thrust System Overprinting Syn-Rift Structures On The Margin Of An Inverted Rift Basin: Indio Mountains, West Texas, Seth Joel Page

Open Access Theses & Dissertations

Detailed mapping in the central Indio Mountains in west Texas, reveal a complex stacking of thrust sheets that record inversion of the Mesozoic Chihuahua Trough rift basin. Important newly recognized structural complexities include both folding of older thrust sheets and development of younger, out-of-sequence thrusts that cut across older folds; detachment fold horizons within thrust sheets; and a regional anticlinorium that exposes the Squaw thrust in a structural half-window bounded on the west by the Neogene Indio normal fault. The Chihuahua trough originated as part of the late Mesozoic border rift system and was inverted during Laramide thrusting. Remnants of …

Development And Characterization Of The Oxidation Behavior Of Various High Temperature Niobium Based Alloys, Benedict Isabel Portillo

Open Access Theses & Dissertations

The oxidation response of various niobium based refractory alloys from the Nb-Mo-Si-B-X alloy system has been examined at temperatures between 700 and 1400°C in air. The development of these alloys was part of an ongoing effort to develop and discover a new materials system capable of replacing nickel based super alloys. Additions of titanium were found to provide limited oxidation resistance. A discontinuous layer of TiO2 was observed to from at temperatures above 1100°C. Alloys containing titanium additions were observed to suffer from pest oxidation at low and intermediate temperatures due to the development of Nb2O5. Poor oxidation resistance at …

Gross National Happiness And It's Third Pillar: A Policy Analysis Of The Bhutanese Broadcast Syatem, Deki Palden Thinlay

Open Access Theses & Dissertations

Bhutan occupies a special position in the international arena with its unique "guiding philosophy for development process called the Gross National Happiness and its objectives holds priority over economic growth. A rapidly changing local media and the foreign channels expanding foreign way of thinking introduce foreign values and cultures. This changing scenario builds up challenges for the government's vision of GNH and the pillar of cultural preservation to prevail. This research analyzes the government's policies available on the broadcast media through document analysis, discussions with people related to the law and policies, and analysis of selected TV and radio program …

Gemini Metallo-Surfactants: Chemical And Physical Properties, Erich Ivan Valenzuela

Open Access Theses & Dissertations

Gemini surfactants are amphiphilic molecules that consist of two surfactant molecules chemically joined together by a spacer group. These molecules tend to self‐assemble into vesicles at much lower concentrations than traditional surfactants and have found many applications in catalysis, adsorption applications, drug‐delivery, nanoscale technology, and biotechnology. In this thesis, the synthesis, characterization and physical properties of a new type of Gemini surfactant derived from dinuclear Cu(II) metal complexes is presented. We call these molecules Gemini Metal‐Organic Surfactants (GMOs).

Three newly developed new GMOs (compounds 1‐3) are composed of Cu(II) ions ligated to a lipid‐functionalized triamine group and the metals are …

Evaluating Suspended Dust Particulate Matter From Anthropogenically - Altered Lands, Roberto Velarde

Open Access Theses & Dissertations

Substantial dust loads are transported from drylands including the Saharan, Asian, and Chihuahuan Desert deposits by localized to planetary-scale processes to nearby and distal sites. These dusts may carry harmful constituents. To evaluate dust movement patterns and characteristics relative to carried constituents, three studies are presented comprising (A) Localized displacement of uranium and progeny radionuclides from high-grade uranium ore storage piles at Peña Blanca, Chihuahua, Mexico; (B) Long-distance transport of plutonium via Saharan and Asian aeolian pathways; and (C) Dust movement patterns in military maneuvering and non-maneuvering areas at White Sands Missile Range (WSMR), New Mexico. Study (A) evaluated surface …

Transferability Of Child Labor Norms: Examining The Link Between Foreign Direct Investment And Child Labor Practices In Developing Countries, Ijtsuri Anayantzin Viveros

Open Access Theses & Dissertations

Why do child labor norms often fail to be transferred or enforced in developing countries even if the implementation of such norms already proved to have substantially reduced child labor practices in developed regions? In the field of international political economy, a number of studies examine how international trade in general and foreign direct investment (FDI, hereafter) in particular influence economic growth, income equality, and balance of trade in developed and developing countries. Extending the literature on international trade and investment, this thesis examines the relationship between FDI and child labor practices in developing countries.

Specifically, I investigate whether and …

Residential Recycling Study, Richard Adams

Open Access Theses & Dissertations

The purpose of this study is to gain baseline performance figures and statistics for El Paso's curbside recycling program. With these baseline statistics the effectiveness of changes for promotion and outreach can be evaluated once implemented. In addition, operational changes such as to every other week recycling collection rather then every week or a "pay as you throw" system could be evaluated.

Novel Photovoltaic Device For Targeted Drug Delivery, Sunny S. Ambure

Open Access Theses & Dissertations

Despite decades of research, progress in targeted drug delivery is relatively slow, hampered, in part, by the lack of appropriate mechanisms to deliver anticancer drugs selectively to tumor tissues. Systemic or oral administration can cause severe toxicity, which limits the therapeutic potential of anticancer drugs [1]. Therefore, the most important goal of drug delivery is to minimize the exposure of normal tissues to these drugs while maintaining their therapeutic concentration in tumors.

A photovoltaic cell (PV) is a system that converts lights into electricity as well as induces charge transfer by photovoltaic effect. Motivated by such unique property, we have …

The Effects Of Tai Chi On Balance And Peripheral Somatosensation In Older Adults With Type 2 Diabetes, Elisabeth Inge Cavegn

Open Access Theses & Dissertations

The increasing prevalence of type 2 diabetes in older adults is a major health concern, as older adults with diabetes have a two- to threefold risk of injurious falls and physical disability. Although studies on the effects of Tai Chi on balance and fall prevention have increased over the last two decades, the benefits for older adults with diabetes, specifically for those with impaired somatosensation in the lower extremities, are limited. Therefore, the purpose of this study was to investigate the effects of Tai Chi exercise on balance, peripheral somatosensation, and fitness in older adults with type 2 diabetes. The …

An Empirical Analysis Of Gasoline Demand In Mexico Using Cointegration Techniques, Mario Elizalde

Open Access Theses & Dissertations

Economic expansion in Mexico has caused fuel consumption in Mexico to increase. Because Mexico does not have sufficient refinery capacity, over 40 percent of total gasoline consumed is imported. This has implications for the balance of payments. In this paper, gasoline demand is empirically examined using co-integration and error correction approaches. Results show no evidence of long-run equilibrium in the Mexican gasoline market. This is potentially attributable to the regulatory regime that governs energy markets in Mexico. Regulated price adjustments that are not consistent with prevailing market conditions run the risk of misallocating resources. Permitting greater flexibility in private gasoline …

A Third-Order Non-Oscillatory Finite-Volume Transport Scheme For Atmospheric Modeling, Kiran Kumar Katta

Open Access Theses & Dissertations

Atmospheric numerical modeling has been going through drastic changes over the past decade, mainly to utilize the massive computing capability of the petascale systems. This obliges the modelers to develop grid systems and numerical algorithms that facilitate exceptional level of scalability on these systems. The numerical algorithms that can address these challenges should have the local properties such as the high on-processor operation count and minimum parallel communication i.e. high parallel efficiency, it should also satisfy the following properties such as inherent local and global conservation, high-order accuracy, geometric flexibility, non-oscillatory advection, positivity preservation.

In the present work, A Third-order …

Speech-Language Pathologists' Reports Of Interprofessional Collaboration And Exposure During Graduate School, Carly Ruth Robalin

Open Access Theses & Dissertations

ABSTRACT

Although the importance and benefits of interprofessional education (IPE) and interprofessional collaboration (IPC) in healthcare have been well demonstrated, the majority of graduate programs in speech-language pathology (SLP) only offer discipline-specific coursework and related experiences. Purpose: The purpose of this study is to explore SLPs' perceptions of their graduate programs' success at preparing them to be interprofessional team-members in the medical work setting. Method: Medically-based SLPs in five Texas cities responded to a survey addressing IPE and IPC. Responses were collected regarding: 1. Interprofessional exposure to physical therapy (PT) and occupational therapy (OT) during graduate school, 2. IPE opportunities …

Easterly Winds Displace Wood-Warblers (Parulidae) During Spring Migration Along The Florida Gulf Coast, Ken F. Tracey, Jon S. Greenlaw

Florida Field Naturalist

No abstract provided.

Be A Friend Of Ffn, Florida Field Naturalist

Florida Field Naturalist

No abstract provided.

Ectoparasites Collected From Common Yellowthroats (Geothlypis Trichas) On Vaca Key, Florida, Lawrence J. Hribar, Gary L. Miller

Florida Field Naturalist

No abstract provided.