Digital Commons Network^™

Positivity-Preserving Segregate-Flux Method For Infiltration Dynamics In Tumor Growth Models, Gilbert Danso Acheampong

Open Access Theses & Dissertations

We study the positivity preserving property and an incompressibility condition in a recently proposed tumor growth model as well as its numerical simulations. In this model, the biological process is described by a free-boundary problem of hyperbolic equations that govern the in-tumor motion of cancer cells and the infiltration of immune cells. Particularly, due to an assumption that cells take constant volume (the incompressibility condition), the tumor growth/shrinkage is closely correlated to the magnitude of infiltration of immune cells into the tumor.

Despite the fact that previous simulation results largely reproduced experimental data, there remain unanswered questions that are crucial …

Tram System Automation For Environmental Spectroscopy And Vegetation Monitoring, Enrique Anguiano Chavez

Open Access Theses & Dissertations

Spectroscopy is the science of studying the interactions of matter and electromagnetic radiation (EMR). In particular, field spectroscopy takes place in a natural environment with a natural source of EMR. The paper presents progress towards the development and automation of a tram cart system. The new system in development collects high resolution, hyperspectral images and data from a spectrometer. Alternatives for a sensor cover mechanism to provide cover for the sensors mounted while the system is not operating are discussed, analyzing and comparing the benefits and disadvantages. An implementation for a charging station in an environment isolated from the electric …

Robust Estimation And Inference For Multivariate Financial Data, Afua Kwakyewaa Amoako Dadey

Open Access Theses & Dissertations

Predicting and forecasting are routine day-to-day activities that guide us in making the best possible choices. They play an integral role in financial analysis. A lot of work has been done on one dimensional geometric Brownian motion (GBM) in stock price prediction. In this line of work, we focus mainly on how to use the one dimensional geometric Brownian motion and the multidimensional geometric Brownian motion in predicting future stock prices. There are several stock prices in the financial market and the multidimensional geometric Brownian motion gives a more realistic prediction compared to the one dimensional GBM. The reason being …

Towards A New Cholx Consciousness: The Visual Rhetorics Of Cholx Artistas As A Method For Social Justice Movements, Elvira Carrizal-Dukes

Open Access Theses & Dissertations

My dissertation study examines the Cholx subculture through the artwork of Chola artistas Paola Rascón and Vicko Alvarez Vega. Growing up, I interacted easily with Cholos and Cholas, but I also knew that in society there was an overall negative idea of Cholos and Cholas. My research advances Cholx consciousness as a method for social movements through the examination of the visual and written rhetorics by Chola artistas. For my dissertation study, I have drawn on theoretical frameworks from Chicana Feminism, Latino Critical Theory, and Social Justice Rhetorics as discussed by Dolores Delgado Bernal, Kendall Leon, Tara Yosso, Daniel Solórzano, …

High Pressure High Heat Flux Pool Boiling Test Facility Design To Investigate Nucleation Boiling Heat Transfer Enhancement Using Micro/Nano-Scale Engineered Structures, Omar Hernandez Hernandez Rodriguez

Open Access Theses & Dissertations

Developing efficient heat dissipation technologies is of critical importance towards the development and the commercialization of next-generation compact and high-performance electronic devices, cooling systems, power generation systems and chemical processing units, as well as retrofitting the existing thermal management schemes. As such, phase change heat transfer systems, more specifically boiling heat transfer systems, have attracted significant attention due to their ability to extract a large amount of latent energy stored within the fluid. Pool boiling is an efficient mode of phase change heat transfer processes accompanied by nucleation of vapor bubbles from liquid on to the hot surfaces, bubble growth, …

Assessing Cervical Cancer Knowledge Among High-Risk Women Living In The Us-Mexico Border Region In El Paso, Tx, Crystal Costa

Open Access Theses & Dissertations

Despite major decreases in cervical cancer incidence rates in the U.S. over the past several decades, certain populations of women continue to be disproportionately affected by it. One of these groups includes US Latina/Hispanic women who have the highest cervical cancer incidence rates as compared to their racial/ethnic counterparts. To improve detection and prevention in US Latina/Hispanic women, it is important to first understand their current knowledge and health literacy with regard to cervical cancer.

This cross-sectional study examined perceived self-knowledge of cervical cancer and cervical cancer functional health literacy in high-risk Hispanic women living in the El Paso, Texas …

Race, Gender And Mediated Representations In The Farah Strike, Matthew Desiderio Minnich

Open Access Theses & Dissertations

May 1972, 4,000 garment workers at Farah Manufacturing Company in El Paso went out on strike for the right to be represented by a union. The strike against Farah was the first major social movement in the El Paso area in modern times. Over 80% of the striking workers were Latina. The female employees at Farah were at the forefront of the Chicana feminist movement. The labor battle at Farah proves the organic link between Chicana feminism and class struggle. The Farah strike caused a new family dynamic to rise from the ashes of the traditional Mexican household. Using Burke's …

Reconciling Carbon Flux Discrepancies In A Desert Environment: Characterizing Influences Of Soil Processes Using Automated Co2 Flux Chambers, Alejandro Lara

Open Access Theses & Dissertations

Dryland ecosystems play a fundamental role in controlling the balance of carbon on a global scale. These ecosystems dominate the inter-annual variability of carbon uptake by terrestrial ecosystems, and this is driven by temperature and precipitation patterns. Despite this global importance, there are some important discrepancies that have been reported between CO2 fluxes measured with differing techniques, particularly between eddy covariance tower measurements of net ecosystem exchange (NEE) of carbon (C) versus on-the-ground methods such as chambers and biomass surveys. The discrepancy is a consequence of instrumentation and measurement technique differences; yet, its biological origins remain unknown. The goal of …

Evaluating The Impact Of The In-Store Programming And Outreach Coalition (Ipoc) On Increasing Access To Healthy Food And Healthcare Services In Paso Del Norte Region: First-Person Account Of Stakeholders' Perspective, Dennis Nyachoti

Open Access Theses & Dissertations

Grocery stores can provide a conducive environment for interventions targeting healthy eating and access to health services, particularly in low-income communities. Nationally, several organizations have implemented grocery store interventions and have shown impact on perceptions of purchasing nutritious food, especially by raising awareness of fruits and vegetables. However, most of those programs have not been implemented in a coordinated manner despite being delivered in the same location. Collaboration of local health promotion organizations with grocery stores could increase consumers' access to and selection of healthy foods, as well as access to and use of services.

This evaluation of the In-Store …

A High-Temperature Valve Design For A Solid Oxide Fuel Cell/Gas Turbine Hybrid System, Cynthia Morales

Open Access Theses & Dissertations

Systems containing high heat generation require thermal management, especially in a solid oxide fuel cell gas turbine (SOFC/GT) hybrid system. The startup of each system in a standalone configuration may be a trivial approach, but when coupled together, different dynamics are experienced. The SOFC/GT provide high theoretical efficiency due to the ability to recover the extra heat produced by the fuel cell (FC) to drive the gas turbine (GT). After recovering the energy recuperated in the GT, the exhaust gas heats the cathode inlet flow to the FC which is an advantage during nominal operation of the cycle but not …

Rhythm Manipulation Of Read Poetic English, Erika Moreno

Open Access Theses & Dissertations

No abstract provided.

Finalcache: Eviction Based On Implicit Entry Reachability, Adrian Veliz

Open Access Theses & Dissertations

Software caches for garbage collected systems are unaware which cache entries are referenced by a client program. Lacking this key information, software caches cannot determine the cache’s contribution to the program’s memory footprint. Furthermore, their eviction heuristics must rely on access history as a proxy for usage. Divergence between usage and access history can undermine the intention of eviction thereby resulting in problematic cache behavior.

This dissertation proposes designs for a novel family of “usage-based” software cache informed of entry reachability by the automatic memory management system. Unlike extant software caches, usage-based caches can accurately determine their memory footprint because …

Qualification And Implementation Of A Liquid Oxygen/ Liquid Methane Data Acquisition System, Zachary Welsh Welsh

Open Access Theses & Dissertations

One of the primary goals of the MIRO Center for Space Exploration and Technology Research (cSETR) is the design and testing of liquid oxygen and liquid methane rocket engines. As of this thesis’ time of writing, two engines are currently undergoing testing at the center’s Technology Research and Innovation Acceleration Park (tRIAC), located in Fabens, Texas. The engines vary in scale starting with a 5 lbf Reaction Control Engine (RCE) to a 500 lbf engine dubbed the Centennial Restartable Oxygen Methane Engine (CROME). It was necessary to develop a control and data acquisition system to support these various test campaigns, …

Effects Of Neuromuscular Electrical Stimulation On Insulin Sensitivity And Glycemic Control: A Systematic Review And Meta-Analysis, Michael James Sanchez

Open Access Theses & Dissertations

Background: Neuromuscular electrical stimulation (NMES) is an effective method to induce involuntary muscle contraction, particularly for populations that are more prone to physical incapacities and metabolic disease.

Purpose: To evaluate existing evidence to determine the effectiveness of NMES on glycemic control and insulin sensitivity.

Methods: Electronic search consisted of MEDLINE (PubMed), EMBASE, Cochrane Library, Google Scholar, and Web of science to identify existing original research studies that investigated the effects of NMES on glycemic control and insulin sensitivity in humans. Studies that met inclusion criteria for the systematic review were then considered for meta-analysis if the studies were designed as …

Analyzing Voter Participation In El Paso County, Texas, Samantha Romero

Open Access Theses & Dissertations

This Thesis seeks to analyze and understand voting patterns in El Paso County, Texas, based on a study of voter turnout in the November 2015 Uniform Election and three key research objectives. The first objective is to provide a systematic statistical evaluation of a local endeavor, the Student Voter Initiative (SVI), to increase voter turnout among youth, specifically 18-year-olds, in the November 2015 Uniform Election. The second objective is to estimate voter turnout by age group (generation) and investigate whether younger voters were underrepresented in the November 2015 Uniform Election compared to older generations, based on generational categories defined by …

Using Computational Fluid Dynamics And Machine Learning To Predict Sled Profile During High Speed Water Braking At Holloman High Speed Test Track, Jose A. Terrazas

Open Access Theses & Dissertations

Accurate prediction of a rocket sled test profile and water braking phenomena has potential to result in radical changes in designs of specific sleds and provide greater confidence of braking mechanism and recovery of critical infrastructures. Understanding the water's behavior with the sled is critical to predicting how the water could damage the sled and affect recoverability of the sled and determine success of the missions. Traditionally, sled design for the test missions had been guided by empirical/hand calculations to estimate the forces on various components. The calculations involved various approximations to arrive at the force balance law and predict …

Application Of Non-Seismic Methods To Analyze And Model The Geometry Of The Northern Margin Of The Onion Creek Salt Diapir, Paradox Basin, Utah, Julia Michelle Astromovich

Open Access Theses & Dissertations

The Onion Creek salt diapir lies within the Paradox Basin of Utah where it forms part of a series of salt walls that separate the Paradox Basin into smaller sub-basins. These sub-basins and associated salt diapirs remain key to several oil and gas traps in the region. A series of anomalous tight folds occur on the northern side of the Onion Creek diapir within the Permian Cutler Group Undifferentiated. These folds are thought to be associated with a shallow detachment horizon with three possible origins:1) a weak shale layer within the Cutler Group, 2) a salt shoulder, or 3) a …

Forecasting Consumer Consumption Behavior Of Water Bottles Using Generlized Linear Model For Supply Chain Resilience, Abdulaziz Alidrees

Open Access Theses & Dissertations

When forecasting the amount of water consumed by individuals at Kuwait's Mubarak Al-Kabeer city Block 8, it is important for any water producing company to tell the amount of water they should produce for its target consumers. After interviewing a couple of residents in this block, it was discovered that they were restricted by being unable to shop for their essentials, including water packs. Data on the amount of water consumption in milliliters for different individuals were collected and recorded. Generic scanners and smartphone scanners were installed in 20 different households that rely on water packs instead of central water …

Love, The Other And The City: Critical Analysis Of The Ethics Of Alterity In A Capitalist Society, Juan Luis Cabrera

Open Access Theses & Dissertations

Loving for Levinas is a desubjectivation. The one who loves is the one who does not resist the call of the Other. He who loves, according to Levinas, recognizes in the face of the migrant, the orphan, the widow, and the poor, as an inescapable responsibility. However, is this desubjectivation a possibility in capitalist cities? Capitalism is the consequence of a philosophical heritage founded in the totality of the same. Philosophy understood as “love of wisdom” places man in a position of control towards everything that surrounds him, the Other included. Everything belongs to the subject that knows the reality …

Elucidating The Regulatory Mechanisms For The Cholesterol Catabolic Pathway Transcriptional Repressor Kstr Of Mycobacterium Tuberculosis, Chenoa D. Arico

Open Access Theses & Dissertations

Mycobacterium tuberculosis (Mtb) is a bacterium that has been able to establish itself throughout evolution and is currently still an ever present threat resulting in approximately 2 million deaths per year worldwide. The ability for Mtb to utilize cholesterol as a carbon source is maintained through transcriptional regulation mechanisms not fully understood. The Rv3574 gene codes for the self-regulated TetR-like transcriptional repressor KstR that controls the expression of large clusters of cholesterol catabolic genes in Mtb. This study aims to provide insights on the regulatory mechanisms of cholesterol catabolism, which could be used as therapeutic target to treat and control …

Design And Additive Manufacturing Of Shape Recovery Polymer Lattice Structure, Chien-Chun Chou

Open Access Theses & Dissertations

Studied mechanical properties of 3D printed metamaterials of BCC, FCC, and BFCC structure.

Computational Advancements Towards Scalable Density Functional Calculations With And Without Self-Interaction Correction, 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 …

Effect Of Temperature On A Piezoelectric Mass Flow Rate Sensor Signal, Lyan Eduardo Gutierrez Hernandez

Open Access Theses & Dissertations

On this research, we are trying to demonstrate that a piezoelectric flow sensor made of PZT can produce a higher and fluctuating signal when exposed to elevated temperatures presented on the system. This type of application can be beneficial for systems that involve changes in temperature such as compressors and be able to predict certain situations presented on those systems that can be catastrophic, that is the case for surge and stall. Therefore, a system capable of going from 25â?°C-90â?°C was designed where a piezoelectric sensor was inserted at a specific location to analyze the signal produced by these changes …

Constructing Community At The Border: Perspectives From Korean-Origin Residents In El Paso, Texas, Josue E. Lopez

Open Access Theses & Dissertations

Studies of communities at the U.S.-Mexico border have usually contrasted their views on living at the border with wider U.S. perspectives which understand the border mainly in terms of security concerns. This Thesis aims to extend such studies through focusing on the Korean-origin community in El Paso, Texas, in order to examine how border perspectives are shaped through global comparisons. The study is organized around two central questions: (1) How do Korean residents experience and construct community in El Paso? (2) How do notions of the Korean border shape or remain separate from notions of the U.S.-Mexico border? Through interviews …

Understanding The Association Between Routine Activities, Social Bonds, Violent Victimization, And Violent Offending, Caleigh D. Lynch

Open Access Theses & Dissertations

No abstract provided.

Streaming Analytics And Workflow Automation For Dfs, Yasith Jayawardana, Sampath Jayarathna

Computer Science Faculty Publications

Researchers reuse data from past studies to avoid costly re-collection of experimental data. However, large-scale data reuse is challenging due to lack of consensus on metadata representations among research groups and disciplines. Dataset File System (DFS) is a semi-structured data description format that promotes such consensus by standardizing the semantics of data description, storage, and retrieval. In this paper, we present analytic-streams – a specification for streaming data analytics with DFS, and streaming-hub – a visual programming toolkit built on DFS to simplify data analysis work-flows. Analytic-streams facilitate higher-order data analysis with less computational overhead, while streaming-hub enables storage, retrieval, …

Towards Making Videos Accessible For Low Vision Screen Magnifier Users, Ali Selman Aydin, Shirin Feiz, Vikas Ashok, Iv Ramakrishnan

Computer Science Faculty Publications

People with low vision who use screen magnifiers to interact with computing devices find it very challenging to interact with dynamically changing digital content such as videos, since they do not have the luxury of time to manually move, i.e., pan the magnifier lens to different regions of interest (ROIs) or zoom into these ROIs before the content changes across frames.

In this paper, we present SViM, a first of its kind screen-magnifier interface for such users that leverages advances in computer vision, particularly video saliency models, to identify salient ROIs in videos. SViM's interface allows users to zoom in/out …

Water Sourcing Strategies Of Highly Resilient Vegetation In Desert Soils: Stable Isotope Analysis Of A Northern Chihuahuan Desert Ecosystem, Hayden Eleanor Thompson

Open Access Theses & Dissertations

Plant water use strategies and water transport dynamics are important for understanding ecosystem productivity and soil-vegetation-atmosphere interactions within an environment (Li et al., 2007). Recent research using stable isotope analysis in wet and humid climates has found that vegetation uses tightly particle-bound water stored in the soil that does not participate in translatory flow (Brooks et al., 2010; Goldsmith et al., 2011; McDonnell 2014). In arid and semi-arid deserts of the United States, highly resilient vegetation, such as the Honey Mesquite (Prosopis glandulosa) and the Creosote shrub (Larrea tridentata), exhibit some degree of activity year-round despite limited water availability during …

Impact Of Cryptococcus Neoformans Polysaccharide Capsule On Astrocytes, Yeon Hwa Woo

Open Access Theses & Dissertations

Cryptococcus neoformans is a neurotropic, opportunistic, encapsulated, yeast-like fungus that causes life-threatening meningoencephalitis in both healthy and immunocompromised individuals. C. neoformans infects 1,000,000 people and causes 210,000 deaths worldwide annually, mostly in sub-Saharan Africa. The polysaccharide capsule of C. neoformans is the fungus major virulent factor. Glucuronoxylomannan (GXM), the main component of the capsule is abundantly released into brain tissue during C. neoformans infection, causing immunosuppressive defects in the host. C. neoformans is inhaled from the environment, disseminate via bloodstream, and crosses the blood brain barrier (BBB) to cause cryptococcal meningoencephalitis (CM). Although CM causes significant mortality in HIV/AIDS patients, …

Planty For The People: A Community-Based Participatory Research Approach To Healthy, Plant-Based Food Access In The Border Region, Marina Villegas

Open Access Theses & Dissertations

Access to food is an issue for many across the U.S., especially in low-income and high minority areas (Gallinar, et al., 2017). The border region of El Paso, Texas has several designated areas without access to supermarkets where residents may purchase food within a walking or short driving distance (HFAC, 2010). Researchers have linked food insecurity to nutritionally inadequate diets, which are shown to lead to obesity or other disorders like heart disease, diabetes, etc. (Marks, 2015; Craig and Mangels, 2009; Bartolotto, 2013). Food insecurity leads to an array of issues down the line that negatively affects not only health …