Digital Commons Network^™

Faculty And Student Interactions At The Community College: An Examination Of The Interaction Order, Amber Archuleta-Lucero

Open Access Theses & Dissertations

Community college students represent 46% of all incoming freshman undergraduate students (American Association of Community Colleges, 2013). Increasingly, research on community colleges is focused on student success and in particular student engagement. One area of student engagement is faculty and student interactions which are an essential part of the collegiate experience.

The purpose of this study is to examine faculty and student interactions at the community college, in particular, the type of interactions, the nature of the interactions as well as how students interpret their interactions with faculty members. With an ever growing emphasis on accountability via student success outcomes …

A Case Study Of Accelerator Performance, Esthela Gallardo

Open Access Theses & Dissertations

In recent years the designs of High Performance Computing (HPC) clusters have become more complex. This is due to the emergence of new processing elements, in particular Graphics Processing Units (GPUs) and other many-core processors that can be combined with multi-core processors to enhance application performance. The design of a cluster includes processing elements that meet the needs of the applications that will run on the system. Unfortunately, it has become increasingly difficult to compare the performance of novel many-core processing elements due to the differences in their architectures. This work describes an attempt to develop a methodology for comparing …

Predicting Recessions Using The Yield Spread: The Mexican Northern Border Case, Laura Mariel Saenz

Open Access Theses & Dissertations

Business cycle analysis is a difficult endeavor. Policymakers are justifiably concerned over recessionary prospects for their respective economies. Being able to predict an incoming recession allows implementing measures to ameliorate the effects of downturns. The yield spread has been extensively used to analyze business cycles in high income economies. The probit model, the most widely utilized model for this type of analysis, enables estimation of the probability (between 0 and 1) that a recession will occur. This study evaluates the predictive power of the Mexico yield spread, the United States yield spread and the real exchange index to anticipate the …

Dynamic Triggering In The Coso Geothermal Field, 2004-2013, Richard A. Alfaro-Diaz

Open Access Theses & Dissertations

We take advantage of EarthScope’s USArray Transportable Array (TA), regional seismic networks to investigate 154 M ≥ 7 earthquakes over a ten-year period (2004- 2013), in search of remotely triggered seismicity within the continental United States. We conduct an automated search to detect high frequency signals (which may indicate triggering of small local earthquakes) using a time window of 5 hours before and after each mainshock. The automated detection applies a short-term average (STA) to long-term-average (LTA) algorithms, to create a catalogue of detections. Using the catalog we search for an increase in detection rates after each main-shock. Sharp increases …

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 …

Evaluating Methods Of Field-Based 3d Visualization And Their Application To Mapping Metamorphic Terranes: An Example From The Panamint Mountains, California, Jade Ashley Brush

Open Access Theses & Dissertations

Field geology has traditionally relied on 2D, paper-based workflows, but digital mapping techniques are rapidly replacing these outdated methods because they allow for more efficient and accurate mapping. This research applies digital mapping techniques and two terrestrially-based 3D visualization technologies, photogrammetry and Light Detection and Ranging (LiDAR), to the study of metamorphic terranes in the Panamint Mountains, California. This study reports on the spatial accuracy of TINs (triangulated irregular networks) generated from both photogrammetry and ground-based LiDAR using a terrestrial laser scanner (TLS) and discusses how spatial accuracy can be increased. Two levels of comparison were used to test spatial …

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 …

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 …

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 …

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 …

Work-Life Balance: A Phenomenological Study On How Female Principals Balance Their Professional And Personal Lives, Blanca Estela Garcia

Open Access Theses & Dissertations

The purpose of this qualitative phenomenological study was to explore lived experiences of female principals and to examine how female principals balance professional and personal lives. A qualitative methodology provided a detailed and rich understanding of the experiences of women in the principalship from women's perspectives. Five female principals were the focus of the study.

The findings revealed that female principals experience work-life conflict because they are expected to fulfill family and work responsibilities. The research resulted in identifying the challenges, the support systems, and strategies utilized by female principals as a means of realizing work-life balance. A conclusion to …

The Effects Of Stock Distributions On Returns, Volatility, And Price, Jason Heavilin

Open Access Theses & Dissertations

This Dissertation investigates three issues regarding the effects of stock distributions on returns, volatility, and prices in an attempt to answer the questions why firms execute stock distributions and why the market appears to favor them. These questions have occupied academicians for at least 40 years (i.e., Fama et al (1969), Ohlson and Penman (1985), Rankine and Stice (1997), Angel (1997), and Crawford et al (2005) among many others).

Chapter 1 studies the notion that the stock market reacts more positive to stock dividends than to stock splits (Rankine and Stice, 1997). However, I find that the stock market does …

Physical Engagement As A Way To Increase Emotional Rapport In Interactions With Embodied Conversational Agents, Ivan Gris Sepulveda

Open Access Theses & Dissertations

One of the major goals in research on embodied conversational agents (ECAs) is to increase the believability and perceived trustworthiness of agents. To improve the efficacy of the interaction between humans and ECAs, I focus on the development of rapport, which is a complex and extensive behavioral state of affinity, synchronicity, coordination and mutual understanding that is difficult to model, measure and interpret. I present our AGENT Framework and our ECA, Adriana, which is capable of speech recognition and gesture recognition over long periods of time. Our current system provides up to 60 minutes of human-ECA interaction in a jungle-survival …

Computational Search For Novel Magnetic Clusters With Large Magnetic Anisotropy Energy, Nabil Md Rakinul Hoque

Open Access Theses & Dissertations

The clusters of transition metal atoms often show high spin moments but generally are reactive with the environment. Passivation of the surface atoms can lead to more stable clusters. We have explored one such avenue for passivation in this work. We picked the As@Ni12@As20 cluster which in the neutral state has a magnetic moment of 3 μB. We doped this cluster with various numbers of Mn atoms by substituting Ni atoms. The substitutional doping leads to spin moments located on the Mn atoms. The doping leads to symmetry breaking and as a consequence the number of structural isomers and spin …

Communication Of Self And Cyberlife Through Avatars In Second Life Online Communities, Kyron Joseph

Open Access Theses & Dissertations

Virtual worlds are becoming more and more recognized for its social capabilities. It's making a splash on the global scale as the use for virtual worlds is surpassing the expected means of the creators. The purpose of this study is to investigate how users in the virtual world of Second Life identify themselves with fellow users through their Avatars through the theory of narrative identity. In the virtual world of Second Life, there are many different avenues that users can express themselves, through the narrative plot analysis these avenues will show the relation to the users and self.

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Keywords: …

An Ethnic Comparison Of Intimate Partner Violence Among Ecuadorian Women Of Reproductive-Age, Marlene Lara

Open Access Theses & Dissertations

Background: Afro-Ecuadorian and Indigenous women in Ecuador are ethnic minorities that may be at a greater risk of intimate partner violence (IPV) and adverse physical, sexual, and psychological health outcomes compared to Mestizo/White majority women. Prior studies have suggested factors such as SES, age, marriage, marital status, prior history of abuse and violence, attitudes regarding IPV, and alcohol and/or drug use are associated to IPV. Aims: The aim of this secondary analysis was to compare IPV prevalence and sociodemographic and health-related correlates by ethnicity (minority versus majority) among Ecuadorian women. Methods: A total of 10,730 Mestizo/White, Indigenous, and Afro-Ecuadorian Ecuadorian …

The Role Of P62/Imp2 In Breast Cancer Progression, Yang Li

Open Access Theses & Dissertations

Breast cancer is one of the most common types of cancer in women. In most patients with breast cancer, it is not the primary tumor that leads to death, but rather metastatic tumors. Once breast cancer spreads to other organs in the body, the disease becomes almost incurable. It is estimated that about 20% to 50% of patients diagnosed with primary breast cancer will develop metastatic disease. Considering this, it is important to understand the molecular and cellular mechanisms behind metastatic breast cancer and to identify new proteins that regulate the metastatic process. These proteins may be used as targets …

The Window To The Bilingual Mind: Eye Movements Reveal Psycholinguistic Grain Unit Sizes Of Bilingual Spoken Word Recognition, Yu-Cheng Lin

Open Access Theses & Dissertations

Although there are common phonological units across different languages, previous studies have shown that individual differences of language proficiency affect sound unit preferences in monolingual and bilingual speakers. The cross-language lexical activation of phonological representations in bilingual minds can provide a great opportunity for testing hypotheses about how this key factor modulates the cross-linguistic phonological transfer across languages. In this study, I used the eye-tracking technique and quantitative methods (i.e., growth curve analysis and multilevel regression) to examine how individual differences in language proficiency affect cross-language phonological unit size transfer in Chinese-English bilinguals. Participants heard a spoken word and were …

Simulation Of Infiltrating Rate Driven By Surface Tension-Viscosity Of Liquid Elements From The Titanium Group Into A Packed Bed, Arturo Medina

Open Access Theses & Dissertations

The simulation of infusion of molten reactive metals (e.g., yttrium) into a porous, carbide packed bed to create carbide and boride composites was studied at ultrahigh temperatures (>1700°C). The infusion was investigated through a computational fluid dynamic (CFD) system of capillary pores and compared to a predicted analytical calculation formulated by Selmak and Rhines. Simulations of two-phase flow penetration of yttrium into a packed bed of B4C were investigated and compared with titanium, zirconium, hafnium, and samarium liquids. The non-reactive, liquid metal infusion was primarily driven by the surface tension and viscosity. The liquid metal depth and rate of …

Keep Your Head Up: Building Life Skills In Youth For Social Reintegration And Success, Olga Lizbeth Ochoa

Open Access Theses & Dissertations

There are multiple factors that contribute to a juvenile's future incarceration when facing difficult environmental circumstances: adjudication (it is like an adult criminal conviction, but generally does not subject the youth to the same direct consequences), community characteristics, the age a young person is discharged, criminal history, and gender. This research is important because it applies social science research in community-based settings to address a social concern, moves beyond theoretical research while contributing to a new orientation of an applied project, and provides a model of university-community partnerships for finding innovative strategies to address issues of social concern for local …

Sexual Self-Esteem And Its Relation To Substance Use And Sexual Risk In A Sample Of Latino Men Who Have Sex With Men And Who Are Living With Hiv, Miriam Pando

Open Access Theses & Dissertations

The objective of the present study was to assess whether sexual self-esteem -- an individual's tendency to feel sexually pleased, attractive, and in control of their sexual thoughts, feelings, and behaviors -- influences the relationship between substance use and sexual risk behavior in a sample of men who have sex with men (MSM) and who are living with HIV. We sampled 106 Latino adult MSM living with HIV who were being treated at a clinic in El Paso, Texas that offers comprehensive HIV/AIDS services. We assessed demographic variables, as well as two domains of sexual self-esteem (i.e., overall feeling of …

Synchronization Of Bistatic Radar Using Chaotic Amplitude And Frequency Modulated Signals, Chandra Sekhar Pappu

Open Access Theses & Dissertations

The purpose of this work is to develop a synchronization scheme for bistatic radar that uses a 3-D chaotic system to generate and process wideband AM and FM signals, which allows for the extraction of high range-resolution information from targets. For AM bistatic radar, the setup includes a drive oscillator at the transmitter and a response oscillator at the receiver. The challenge is synchronizing the response oscillator to the drive oscillator with a scaled version of the transmitted signal sr(t, x) = αs t(t, x), where x is a chaotic state variable and α is a scaling factor. Here, α …

Rare Pride Campaigns: Evaluating Participatory Communication In Conservation Efforts Throughout Indonesia, Lauren Elizabeth Perez

Open Access Theses & Dissertations

Communication scholars who study international development and social change have found that if facilitators of social change hope to find positive, lasting solutions to complex social and environmental issues, they must incorporate more participatory approaches. However, even the practitioners with the most noble intentions oftentimes fall short of facilitating truly participatory practices because their strategies are the product of linear processes for evaluating the change context. In this study, I apply Lennie and Tacchi's (2014) approach to evaluating communication for development in a case study of Pride Campaigns implemented by managers throughout Indonesia who partnered with the conservation non-governmental organization …

Enterprise Systems, Information Security Management Systems And Their Impact On Enterprise Risk: A 3-Essay Dissertation, Fernando Parra Reyes

Open Access Theses & Dissertations

This 3-essay study offers a comprehensive examination of hypothetical concepts related to the behaviors, attitudes, outcomes, processes, experiences, manifestations and indicators connected with an organizationâ??s design, implementation and management of a coherent set of policies, processes and systems to manage risks to its information assets. Network analysis tools are used to examine the relationships found in Information Security Management Systems (ISMS) literature published within the last decade. This study examines the effect of upgrades and implementations of enterprise systems on enterprise risk, as perceived by external investors. Finally, this study also assesses the impact of external IT governance certifications on …

Student Experiences In College Readiness Programs: A Phenomenological Study, Marisa Elva Pierce

Open Access Theses & Dissertations

This study discusses the concept of college readiness initiatives and defines what educational systems expect from this level of readiness of a high school student. It demonstrates that the topic of college readiness is broad and particularly concerned with academic rigor, teacher preparedness, and administrative support systems. The purpose of this study is to examine an aspect of these initiatives that is not often addressed - how students experience these programs.

Attempts to research the topic of college readiness from the lens of the student yielded few studies on the issue. Consequently, seeking a grounded understanding of the meaning and …

Studying Cellular And Molecular Interaction With Two-Photon Fluorescence Microscopy, Arifur Rahaman

Open Access Theses & Dissertations

Advances in microscopy and fluorescent probes provide new insight into studying cellular and molecular interactions. Two-photon fluorescence microscopy is one of the most important recent inventions in cellular and molecular study. This technology enables noninvasive study at cellular and molecular levels in three dimensions with submicrometer resolution. Two-photon excitation of fluorophores results from the simultaneous absorption of two photons. This excitation process has a number of unique advantages, such as reduced specimen photodamage and enhanced penetration depth. In this study, we used our two-photon microscope to observe predatorial behavior of fast moving bacterivorous marine organism Cafeteria roenbergensis and quantify Mycobacterium …

A Stochastic Approach For Pavement Condition Projections And Budget Needs For The Mtc Pavement Management System, Rafael Arturo Ramirez Flores

Open Access Theses & Dissertations

Pavement management decision-making is the most important task for officials in transportation agencies, who develop maintenance and rehabilitation programs. Information about historical pavement network performance is needed for decision-making; pavement management systems (PMS) provide means to organize road network data to improve the pavement network condition. PMS have prediction performance models to forecast the future condition of the pavement networks with information required for decision-making; these models can be deterministic or probabilistic. Pavement performance deterministic models are commonly used in PMS, but they do not consider the uncertainty in forecasting pavement performance. Pavement performance depends on many random factors like …

A Tectonic Analysis On The Central Region Of The Himalaya Collision Zone Using Double Difference Tomography, Chanel Perez

Open Access Theses & Dissertations

The Himalaya mountain range remains the only place on Earth undergoing continuous effects from the continental-continental collision between India and Asia. Because of this, the Himalayas have been subjected to extensive deformation and transpression, and contain five major shear zones. Extensive seismic analysis of the region, however, is lacking due to sparse seismograph coverage and complexity of the crustal structure. I examined seismic event data from two temporary seismic networks deployed in the central Himalaya, the HIMNT deployment from 2001-2003, and the Bhutan deployment from 2002-2003. Using this data I develop a 3-D earth model for the region using double-difference …

Event Related Potentials In A Two Stimuli Auditory Oddball Task In Concussed College Athletes: A Linguistic Component Replication Study, Christopher Anthony Roosmalen

Open Access Theses & Dissertations

Concussions affect an estimated 1.6 to 3.8 million individuals annually and can result in persistent symptoms and cognitive impairments in attention and memory. Concussions are a rising health concern especially in concussion management. Event Related Potentials (ERP) may more accurately assess cognitive recovery making better return to play decisions. In 2013, Sanchez found no significant difference between concussed athletes and non-concussed individuals in the in amplitude of the P300 ERP component using an auditory oddball task consisting of 2 different consonant, vowel (CV) syllables. Because participants were instructed to maintain a mental and verbal count of the target stimuli, a …

Neighbor Discovery In Mobile Ad Hoc Networks, Esau Enrique Ruiz-Gaistardo

Open Access Theses & Dissertations

Neighbor Discovery (ND) is the process that initializes a reliable communication between one-hop neighbors in mobile ad hoc networks (MANETs). This process consists of scheduled exchanges of control messages, called â??Hello Messagesâ?? (HMs) between one-hop neighbors. HMs build bidirectional links that are used to announce the topology information. Each node uses ND and the topology information to populate its routing tables and to communicate with every other node in the network. In MANETs, ND process is a permanent process to discover one-hop neighbors. It is based on two parameters: 1) ND message interval (the period of time in between sending …