Digital Commons Network^™

Analyzing The Effectiveness Of Al Qaeda's Online Influence Operations By Means Of Propaganda Theory, David K. Lyons

Open Access Theses & Dissertations

This thesis sought to explore the use of propaganda by al Qaeda through the lenses of established propaganda theorists and theories. Through analyzing former al Qaeda releases and case studies in the context of propaganda theory this thesis established a clearer understanding of the effectiveness of al Qaeda's propaganda. After analyzing the propaganda and case studies it was discovered that the rate of those engaging in attacks based on al Qaeda's online influence operations is insignificant. The concerns that al Qaeda is recruiting numerous individuals to engage in attacks based on its online propaganda operations might be overstated and while …

Academic And Social Adjustment Of Students Transitioning From An Early College High School Program To An Institution Of Higher Education, Catie Mccorry-Andalis

Open Access Theses & Dissertations

Historically, minority and low-income populations have faced numerous challenges in achieving a higher education particularly students of Latino descent. Gandara and Contreras (2009) explain that Latinos are the fastest growing population in the United States and yet academically, they are further behind than any other ethnic group in the nation. However, as the nation continues to grapple with how best to educate its children, and programs such as early college high schools grow in popularity, a viable solution to closing the academic achievement gaps of minority students, it is more important than ever that there is an understanding of how …

Investigations Into The Underpricing Of Seasoned Equity Offerings And The Cost Of Equity, Anh Duc Ngo

Open Access Theses & Dissertations

This dissertation consists of three separate but related essays investigating new determinants of the underpricing of seasoned equity offering (SEOs). It also examines new mechanisms and channels that affect the pricing of SEOs. The first essay examines the impacts of earnings smoothing on SEO underpricing. It aims to investigate whether earnings smoothing can add value to firms by reducing the degree of SEO underpricing. The findings show that smoothing earnings performance resulting from discretionary accruals is negatively related to SEO underpricing and improve earnings informativeness. This essay contributes specifically to the current literature on earnings smoothing by demonstrating that high …

Eyewitness Memory In Adults, Carlos Manuel Vargas

Open Access Theses & Dissertations

This study encompasses the areas of eyewitness misidentifications and eyewitness suggestibility by developing a Video Suggestibility and Eyewitness Identification Scale for adults. Two hundred one college students were recruited to test this novel psychometric scale following procedures loosely based on the Gudjonsson Suggestibility Scales. The two main subscales proposed are labeled True, which measures non-leading questions answered correctly, and Yield, which measures questions endorsed based on misinformation; two lineup identification subscales were also analyzed for exploration. Reliability estimates showed acceptable internal consistency of True and Yield subscales after negative feedback was provided; while reliability in Target Present Lineups increased and …

A Human-Agent Teamwork Command And Control Framework For Moving Target Defense (Mtc2), Marco M. Carvalho, Thomas C. Eskridge, Larry Bunch, Jeffrey M. Bradshaw, Adam Dalton, Paul Feltovich, James Lott, Daniel Kidwell

Electrical Engineering and Computer Science Faculty Publications

In this paper we discuss the need for a command and control (C2) capability for moving target (MT) defenses. We describe some of the requirements and constraints associated with such a capability, and propose a human-agent teamwork approach for MTC2. We further discuss some specific concepts and technologies that could play an important role in the development of this capability, and conclude by describing some implementation details of a prototype being developed to demonstrate and study the proposed concepts for MTC2. Copyright 2012 ACM.

Using The Theory Of Planned Behavior As A Predictor Of Radiologic Technologists' Use Of Patient Radiation Protection Best Practices: A Regional Study, Brenda L. Boyd

Dissertations

Problem. A growing concern exists that patients are receiving an increase in radiation exposure while undergoing medical imaging exams. According to a March 2009 report by the National Council on Radiation Protection and Measurements (NCRP), the U.S. population's total exposure to ionizing radiation has nearly doubled over the past two decades. With the introduction of new digital radiology equipment, patient dose is on the rise. Possible reasons for a radiologic technologist's behavior include: influence by availability or lack of equipment, policies, social pressure, attitudes, and a safety culture. Little research has been done in this area, specifically with applying a …

Comparing And Contrasting Manual Direct Touch Interaction With Tangible User Interfaces For Mapping Applications, Timothy G. April

Master's Theses and Capstones

Multi-touch interfaces are growing in popularity for many forms of computing devices, including mobile devices, as well as personal and shared workstations. There has been limited exploration into the use of tangible user interfaces in conjunction with multi-touch displays for extracting data from geocoded data. Specifically, it is not known if tangible user interfaces are faster, easier or more intuitive to use than existing touch based controls. We hypothesize that tangible user interfaces will be faster, more satisfying and more desirable than touch based controls for extracting data from geocoded data. We set out to explore one tangible user interface …

Steady Late Quaternary Slip Rate On The Cinarcik Section Of The North Anatolian Fault Near Istanbul, Turkey, Hulya Kurt, C. C. Sorlien, L. Seeber, M. S. Steckler, D. J. Shillington, G. Cifci, Marie-Helene Cormier, J.-X. Dessa, O. Atgin, D. Dondurur, E. Demirbag, S. Okay, C. Imren, S. Gurcay, H. Carton

Graduate School of Oceanography Faculty Publications

The distribution of plate motion between multiple fault strands and how this distribution may evolve remain poorly understood, despite the key implications for seismic hazards. The North Anatolian Fault in northwest Turkey is a prime example of a multistranded continental transform. Here we present the first constraints on late Quaternary slip rates on its northern branch across the Cinarcik Basin in the eastern Marmara Sea. We use both deep penetration and high‐resolution multichannel seismic reflection data with a stratigraphic age model to show that a depocenter has persisted near the fault bend responsible for that transform basin. Successively older depocenters …

Four Current Meter Models Compared In Strong Currents In Drake Passage, D. Randolph Watts, Maureen A. Kennelly, Kathleen A. Donohue, Karen L. Tracey, Teresa K. Chereskin, Robert A. Weller, Ivan Victoria

Graduate School of Oceanography Faculty Publications

Seven current meters representing four models on a stiffly buoyed mooring were placed for an 11-month deployment to intercompare their velocity measurements: two vector-measuring current meters (VMCMs), two Aanderaa recording current meter (RCM) 11s, two Aanderaa SEAGUARDs, and a Nortek Aquadopp. The current meters were placed 6-m apart from each other at about 4000-m depth in an area of Drake Passage expected to have strong currents, nearly independent of depth near the bottom. Two high-current events occurred in bursts of semidiurnal pulses lasting several days, one with peak speeds up to 67 cm s⁻¹ and the other above 35 …

Sulfur Degassing At Erta Ale (Ethiopia) And Masaya (Nicaragua) Volcanoes: Implications For Degassing Processes And Oxygen Fugacities Of Basaltic Systems, J. M. De Moor, T. P. Fischer, Z. D. Sharp, P. L. King, M. Wilke, R. E. Botcharnikov, E. Cottrell, M. Zelenski, B. Marty, K. Klimm, C. Rivard, D. Ayalew, C. Ramirez, Katherine A. Kelley

Graduate School of Oceanography Faculty Publications

We investigate the relationship between sulfur and oxygen fugacity at Erta Ale and Masaya volcanoes. Oxygen fugacity was assessed utilizing Fe³⁺/∑Fe and major element compositions measured in olivine‐hosted melt inclusions and matrix glasses. Erta Ale melts have Fe³⁺/∑Fe of 0.15–0.16, reflecting fO₂ of ΔQFM 0.0 ± 0.3, which is indistinguishable from fO₂ calculated from CO₂/CO ratios in high‐temperature gases. Masaya is more oxidized at ΔQFM +1.7 ± 0.4, typical of arc settings. Sulfur isotope compositions of gases and scoria at Erta Ale (δ³⁴S_gas − 0.5‰; δ^{34 …}

How Do Fishing And Environmental Effects Propagate Among And Within Functional Groups?, Marie-Joëlle Rochet, Jeremy Collie, Verena M. Trenkel

Graduate School of Oceanography Faculty Publications

Competition and predation can play different roles in mediating the influence of external pressures, such as fishing or environmental variations, on marine communities. Pressure effects propagate through food webs along predation links. These predator-prey interactions may result in trophic cascades, but they can be buffered by competitive interactions. We investigated these mechanisms by taking a functional-group approach. Are functional groups affected by external pressures in a predictable way? Within functional groups, do all species respond in the same way, or does competitive release allow for compensation among species? We constructed a simple community model, with functional groups connected by predation …

Intrusive Dike Complexes, Cumulate Cores, And The Extrusive Growth Of Hawaiian Volcanoes, Ashton F. Flinders, Garrett Ito, Michael O. Garcia, John M. Sinton, Jim Kauahikaua, Brian Taylor

Graduate School of Oceanography Faculty Publications

The Hawaiian Islands are the most geologically studied hot‐spot islands in the world yet surprisingly, the only large‐scale compilation of marine and land gravity data is more than 45 years old. Early surveys served as reconnaissance studies only, and detailed analyses of the crustal‐density structure have been limited. Here we present a new chain‐wide gravity compilation that incorporates historical island surveys, recently published work on the islands of Hawai‘i, Kaua‘i, and Ni‘ihau, and >122,000 km of newly compiled marine gravity data. Positive residual gravity anomalies reflect dense intrusive bodies, allowing us to locate current and former volcanic centers, major rift …

Upgrades To Nrlmol Code, Luis Basurto

Open Access Theses & Dissertations

This project consists of performing upgrades to the massively parallel NRLMOL electronic structure code in order to enhance its performance by increasing its flexibility by: a) Utilizing dynamically allocated arrays, b) Executing in a parallel environment sections of the program that were previously executed in a serial mode, c) Exploring simultaneous concurrent executions of the program through the use of an already existing MPI environment; thus enabling the simulation of larger systems than it is currently capable of performing. Also developed was a graphical user interface that will allow less experienced users to start performing electronic structure calculations by aiding …

An Evaluation Of The Cerro Process As An Efficient Ro Concentrate Management System, Guillermo Guadalupe Delgado

Open Access Theses & Dissertations

The Concentrate Enhanced Recovery Reverse Osmosis (CERRO) Process is a new method to treat RO concentrate and brackish water with high concentrations of silica and calcium sulfate. Prior investigations have shown that the CERRO process can treat this kind of water without fouling or scaling the membranes, but the main factors that allow the system to operate in such conditions were not studied. The research presented here is an evaluation of the CERRO process as an efficient RO concentrate management system. The parameters of operation of the system were evaluated and improved. The precipitation of calcium sulfate was identified as …

Prediction Of Foreign Object Debris/Damage (Fod) Type For Elimination In The Aeronautics Manufacturing Environment Through Logistic Regression Model, Natalia V. Espino

Open Access Theses & Dissertations

Foreign Object Debris/Damage (FOD) is a costly and high-risk problem that aeronautics industries such as Boeing, Lockheed Martin, among others are facing at their production lines every day. They spend an average of $350 thousand dollars per year fixing FOD problems. FOD can put pilots, passengers and other crews' lives into high-risk. FOD refers to any type of foreign object, particle, debris or agent in the manufacturing environment, which could contaminate/damage the product or otherwise undermine quality control standards. FOD can be in the form of any of the following categories: panstock, manufacturing debris, tools/shop aids, consumables and trash. Although …

Acoustic Analysis Of The Allophones Of The Mid-Front Spanish Vowel /E/, Raquel Gonzalez De Anda

Open Access Theses & Dissertations

This thesis examines the Spanish phoneme /e/ and its open allophone(s). Current literature shows that there is no complete agreement with regards to the specific phonetic environments that trigger the opening of /e/, nor if "open" is the best term to describe the allophone(s). Examining /e/ allophones in Spanish monolinguals clarifies current literature inconsistencies; and therefore, creates a baseline for future studies related to this particular vowel. In this study, the speech of ten Spanish monolingual university students was recorded. Participants read a list of words that contained /e/ in certain phonetic contexts. Each instance of /e/ was acoustically analyzed …

Strengthening Cognitive Development In Minority Populations: A Study Of The Beneficial Effects Of Bilingualism, Marisela Gutierrez

Open Access Theses & Dissertations

The long-term goal of this research is to better understand and characterize the "bilingual advantage" so that educational and child care institutions begin to recognize and encourage the active use of two languages to strengthen cognitive development in minority populations. The present study is one of the first one to include a very large sample of well-defined "active bilinguals" who, by objective measures, were determined to be bilingual and determined to engage in language switching on a daily basis. Another goal was to manipulate and activate in the laboratory what might be referred to as the "switching benefit." One hundred …

The Influence Of Case-Specific Expert Testimony On Juror Sensitivity To Confession Evidence, Skye Alani Woestehoff

Open Access Theses & Dissertations

Research on the effect of expert testimony has resulted in incongruent findings. Expert testimony has been shown to lead to sensitivity, by educating participants about the evidence and facilitating the application of this knowledge, and skepticism, by causing jurors to distrust the evidence regardless of its quality. The current study explored the role of expert testimony in improving participants' evaluation of confession evidence. Data were collected from 352 students and 281 community members. Participants read a trial transcript that included a low-pressure, medium-pressure, or high-pressure interrogation. Participants also read expert testimony that was general, case-specific, or no testimony at all. …

Multiplicity Adjustments For Respecification Searches In Structural Equation Models, John Appiah Kubi

Open Access Theses & Dissertations

Structural Equation Modeling (SEM), as a statistical modeling technique, is one of the most comprehensive and flexible approaches to data analysis currently available. Its use has been increasing steadily over the past few decades. Generally, it refers to a family of

techniques that employs the analysis of covariance to establish relationships among a set of variables. It allows researchers (or users) to assess the adequacy of their hypothesized models with their sample data. Often times, in assessing their models, researchers are not

only interested in the overall fit of their model but they are also interested in knowing which proposed …

Evaluation Of Novel Backwashable Cartridge Filters: Efficacy And Sustainability, Michelle Brown

Open Access Theses & Dissertations

One of the important aspects of desalination pre–treatment is the removal of particles from feedwater. This is typically accomplished using a combination of gross filtration and cartridge filtration. Cartridge filters are typically single–use products, and their replacement can represent a significant portion of a desalination plant's operating budget. This research evaluated the performance of a new type of cartridge filter that is backwashable and aims to reduce the overall cost to desalination facilities and provide cleaner water. Two sets of filters were evaluated (in triplicate) with respect to particle removal efficiency and hydraulic efficiency. The initial set included four types …

Pressure And Heat Flux Effects On The Heat Transfer Characteristics Of Liquid Methane, Chance Paul Garcia

Open Access Theses & Dissertations

The heat transfer effects on liquid methane are investigated with the use of a carbo-thermal rig at the Center for Space Exploration Technology Research (cSETR) located at the University of Texas at El Paso (UTEP). The cSETR carbo-thermal rig design approach is presented along with the design of a methane condensing mobile unit (MCMU) to supply the laboratory and rig with liquid methane. The proposed research will generate useful insight in to heat transfer coefficient behavior, non-dimensional correlations, different flow conditions, varied inlet conditions, and varied heat flux for a subscale test article applicable to a regenerative cooled rocket engine …

A Case Study Towards Verification Of The Utility Of Analytical Models In Selecting Checkpoint Intervals, Michael Joseph Harney

Open Access Theses & Dissertations

As high performance computing (HPC) systems grow larger, with increasing numbers of components, failures become more common. Codes that utilize large numbers of nodes and run for long periods of time must take such failures into account and adopt fault tolerance mechanisms to avoid loss of computation and, thus, system utilization. One of those mechanisms is checkpoint/restart. Although analytical models exist to guide users in the selection of an appropriate checkpoint interval, these models are based on assumptions that may not always be true. This thesis examines some of these assumptions, in particular, the consistency of parameters like Mean Time …

Anasic Design And Test Methodology For An Undergraduate Design And Fabrication Project, Arun Joseph Kurian

Open Access Theses & Dissertations

During the 1990's the main focus of chip design methodologies was on the timings and area constraints. Power consumption was considered significant only after a drastic increase of device densities from 130nm on as well as dramatic increases in sub threshold leakage. As technology advanced from 130nm to 90nm and below there was a significant increase in leakage current due to lower threshold voltage and the influence of the deep submicron effects. High power consumption causes different problems such as increasing the cost of the product, reducing the reliability, reducing the battery life among others. Therefore EDA tools were designed …

An Intra-Individual Event-Related Potential-Based Concealed Attitude Test, David R. Herring

Open Access Theses & Dissertations

The evaluative oddball is an implicit measure for detecting (concealed) attitudes. In evaluative oddball studies, low occurrence stimuli such as negative pictures are presented among high occurrence context stimuli such as positive pictures. Late positive potentials (LPPs) of the event-related potential (ERP) are larger to evaluatively incongruent stimuli such as negatives compared to congruent stimuli such as positives with the context (e.g., positives). In prior evaluative oddball paradigms, this evaluative congruity effect of the LPP was reduced when participants concealed compared to truthfully reported attitudes. Because prior evaluative oddballs have been focused on the group level analysis, it has been …

Effects Of Positive Distortion Instructions On The Factor Structure Of Socially Desirable Responding Scales, Corina Mendoza

Open Access Theses & Dissertations

Socially desirable responding (SDR) is the manifestation of an individual's desire to represent him or herself in a positive light on a self-report questionnaire. Two distinct types of questionnaire scales are commonly used to identify individuals who have engaged in SDR: Impression Management (IM) and Self-Deceptive Enhancement (SDE) scales. In the present study, 653 undergraduate students completed four IM scales, three SDE scales, and two brief questionnaires measuring the Big Five personality factors. Participants were randomly assigned to either a Control condition, in which they were instructed to complete the questionnaires according to standard instructions, or a Positive Distortion (PD) …

Reducing Metal Alloy Powder Costs For Use In Powder Bed Fusion Additive Manufacturing: Improving The Economics For Production, Fransisco Medina

Open Access Theses & Dissertations

Titanium and its associated alloys have been used in industry for over 50 years and have become more popular in the recent decades. Titanium has been most successful in areas where the high strength to weight ratio provides an advantage over aluminum and steels. Other advantages of titanium include biocompatibility and corrosion resistance. Electron Beam Melting (EBM) is an additive manufacturing (AM) technology that has been successfully applied in the manufacturing of titanium components for the aerospace and medical industry with equivalent or better mechanical properties as parts fabricated via more traditional casting and machining methods. As the demand for …

Process Study And Control Of Electron Beam Melting Technology Using Infrared Thermography, Jorge Mireles

Open Access Theses & Dissertations

An IR camera was installed in an Arcam A2 system (Arcam AB, Mölndal, Sweeden) and layer-by-layer image acquisition was achieved. The camera's capability to detect manufacturing defects was evaluated by implementing computer vision techniques using LabVIEW measurement and programming software (National Instruments, Austin, TX). Thermal maps acquired by the IR camera allowed layer-by-layer part temperature to be recorded. A core objective of this research was to study the impact of processing temperature on EBM-fabricated Ti-6Al-4V parts and achieve controlled mechanical properties. In this research, build variations were achieved by modifying parameters that change processing temperature from the standard processing temperature. …

Organic Photovoltaics: A Charge Transfer Perspective In The Study Of Donor-Acceptor Systems, Marco Olguin

Open Access Theses & Dissertations

The present research involves the study of donor-acceptor (D/A) dyad complexes from a charge transfer energy perspective. The aim is to provide insight and predictive understanding into the charge transfer processes of the molecular-level components in donor-acceptor based organic solar cells using computational methods to describe photochemical processes at the quantum mechanical level within the Density Functional Theory (DFT) approximation. Predictive understanding is anchored in reproducing experimental results, wherein the present work a perturbative excited-state DFT method is described in detail and shown to give Charge Transfer (CT) energies in excellent agreement with benchmark experimental data. With an accurate excited …

Efficient, Scalable, Parallel, Matrix-Matrix Multiplication, Enrique Portillo

Open Access Theses & Dissertations

For the past decade, power/energy consumption has become a limiting factor for large-scale and embedded High Performance Computing (HPC) systems. This is especially true for systems that include accelerators, e.g., high-end computing devices, such as Graphics Processing Units (GPUs), with terascale computing capabilities and high power draws that greatly surpass that of multi-core CPUs. Accordingly, improving the node-level power/energy efficiency of an application can have a direct and positive impact on both classes of HPC systems.

The research reported in this thesis explores the use of software techniques to enhance the execution-time and power-consumption performance of applications executed on a …

Preparing Teachers For Use Of Impact Activities: An Exploratory Study, Jeremy Lee Ramirez

Open Access Theses & Dissertations

The iMPaCT project team has developed three modules of activities that use programming on TI-83/84 calculators as a means to engage students to explore foundational concepts in Algebra I. The developers conducted a 3-day summer Professional Development Program (PDP) for teachers to become familiar with the objectives, pedagogy, assessments, and resources of the three modules of iMPaCT activities. I have collected and analyzed various forms of data such as videotapes of workshop sessions, teachers' written work and a pre-post assessment. The purpose of this study is to provide the program coordinators with information about the PDP for planning of future …