Digital Commons Network^™

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 …

The Development Of Self-Supported Electromechanical Structures Using Fused Deposition Modeling, Jorge Ramos-Almeida

Open Access Theses & Dissertations

Recent research has focused on the fabrication freedom of 3D printing to create not only conceptual models but also final end-use products. In the last decade, several research groups have reported embedding electronic components and electrical interconnects into 3D printed structures during process interruptions; however, to date there is an absence of fabricated devices with electromechanical functionality for parts fabricated in a single Additive Manufacturing (AM) build sequence.

The focus of this research is the use of Fused Deposition Modeling (FDM) to manufacture a self-supported electromechanical motor. FDM is an AM process capable of building parts in a layer-by-layer fashion. …

Asynchronous Logic Design With Increased Fault Tolerance And Optimized For Subthreshold Operation, Ivan Santos

Open Access Theses & Dissertations

Synchronization has always been an essential feature in electronic circuits, in which functionality is achieved by an appropriate flow of data with respect to time. An ideal concept of logic design would require every operation to happen instantly; however, the application of this principle to electronics is governed by the laws of physics, which influence the time to execute a process. In fact, the speed at which a microprocessor can perform logic operations is determined by the time that charging and discharging capacitive loads requires, and the time that electric signals spend when traveling through the circuitry. Consequently, the variation …

Propagation Of Interval And Probabilistic Uncertainty In Cyberinfrastructure-Related Data Processing And Data Fusion, Christian Servin

Open Access Theses & Dissertations

Data uncertainty affects the results of data processing. So, it is necessary to find out how the data uncertainty propagates into the uncertainty of the results of data processing. This problem is especially important when cyberinfrastructure enables us to process large amounts of heterogeneous data. In the ideal world, we should have an accurate description of data uncertainty, and well-justified efficient algorithms to propagate this uncertainty. In practice, we are often not yet in this ideal situation: the description of uncertainty is often only approximate, and the algorithms for uncertainty propagation are often not well-justified and not very computationally efficient. …

Benefits Of Baby Sign On Cognitive Development In Infants, Clarissa Navedo

Open Access Theses & Dissertations

Research in the area of baby sign language has increased dramatically over the past several years, however there is still a lack of research regarding baby signs effects on typical infant development, specifically in the area of cognition. The hypothesis of this study was that instruction of baby sign would be correlated with a significant increase in the development of cognition and language acquisition for infant participants. This study provided a five-week instructional course on baby sign for parents/caregivers to implement with their typically developing infants (n=11). The course provided instruction of baby signs, methods of implementation and encouragement to …

Model Fusion: A New Approach To Processing Heterogeneous Data, Omar Ochoa

Open Access Theses & Dissertations

In many practical situations, it is necessary to extract

information from data of different types. For example, in geosciences, several sources of data can be used to determine the interior structure of the earth: the first arriving waves from earthquakes and from man-made sources, measurements of the earth's gravity field, measurements of the dispersion of surface waves generated by earthquakes, etc. At present, most existing data processing techniques deal only with data of one type.

A joint use of all the information derived from multiple types of data sources is an important theoretical and practical challenge. Such a joint use …

Carbon Emissions From Soil Respiration In The Northern Chihuahuan Desert Shrubland, Anna Cristina Ortiz

Open Access Theses & Dissertations

The United States Department of Agriculture's Jornada Experimental Range (JER), is located in the northern Chihuahuan Desert in southern New Mexico and historically functioned as an experimental rangeland for cattle grazing. Historical grazing in the US Southwest has been identified as a leading, but not the sole, factor that has led to the conversion of pristine grasslands to shrublands, such has been the case on the JER. The estimated increased variability in precipitation intensity and frequency that is predicted to occur with climate warming will likely affect ecosystem responses from ecological processes including primary productivity, microbial decomposition, and thus respiration. …

(Re)Mapping The Rhetorical Situation: Toward A Transactional Networked Ecology, Ramesh Kumar Pokharel

Open Access Theses & Dissertations

The existing theories of the rhetorical situation that focus on and around Bitzer's theory define the rhetorical situation as something "real," "genuine," "objective" based on historic reality. I believe that this modernist containment to perceive the rhetorical situation as fixed entities limit our understanding about it in a broader sense, because it cannot capture the changed meaning that naturally exists with the impact of new media and technology. With the advent of new media and technology, the notion of rhetorical situation also has changed and thus there is an exigence of a new theory of the rhetorical situations that better …

3d Printed Impedance Elements By Micro-Dispensing, Ubaldo Robles Dominguez

Open Access Theses & Dissertations

Micro-dispensing allows electric circuits to be "3D printed," which can be used to give 3D printed systems electronic and electromagnetic functionality. The focus of this thesis is using micro-dispensing to fabricate capacitors and inductors. 3D printed impedance elements are capable of being more easily embedded, can be used to create structural electronics, and will have extensive applications in antennas, metamaterials, frequency selective surfaces, and more. This is the first known effort to print and measure impedance elements by micro-dispensing which holds great potential for manufacturing multi-material devices.

Developing A Sustainable Ecotourism Foundation In Indonesian National Parks Using Cross-Cultural Adaptation And Communication Framing, Adriana Salas

Open Access Theses & Dissertations

Previous research on ecotourism in Southeast Asia has focused on its positive and negative effects for conservation. However, the focus in this particular study is to look at what it takes to run a successful ecotourism site in four diverse areas in Indonesia using communication elements like cross-cultural adaptation and communication framing. Communication should be used as a baseline for a successful site and should be used as the most useful tool to address issues and challenges in ecotourism project development.

A successful ecotourism site must carefully look at how their ideas and programs are framed. Ecotourism must also create …

Event Related Potential Changes In A Two-Stimulus Auditory Oddball Task In Concussed College Athletes: A Linguistic Component, Paola G. Sanchez

Open Access Theses & Dissertations

"Return to Play" decisions are done based on cognitive-communicative testing and clinical assessments; concussed athletes may benefit from electrophysiological testing for a more accurate representation of their recovery. The purpose of this study is to investigate the electrophysiological performance post-concussion analyzing the attentional differences using the traditional "oddball" paradigm with a CV linguistic component. Participants for this study were 6 male college athletes with a history of concussion and 10 participants with no history of concussion (controls). Athletes were evaluated using event-related potentials (ERPs) that were recorded during a consonant-vowel (CV) auditory oddball task. Both the P300a and P300b components …

A Convex Optimization Algorithm For Sparse Representation And Applications In Classification Problems, Reinaldo Sanchez Arias

Open Access Theses & Dissertations

In pattern recognition and machine learning, a classification problem refers to finding an algorithm for assigning a given input data into one of several categories. Many natural signals are sparse or compressible in the sense that they have short representations when expressed in a suitable basis. Motivated by the recent successful development of algorithms for sparse signal recovery, we apply the selective nature of sparse representation to perform classification. Any test sample is represented in an overcomplete dictionary with the training sample as base elements. A given test sample can be expressed as a linear combination of only those training …

The Impact Of Baby Sign On The Development Of Pragmatic Skills In Typically Developing Children, Lyna Marie Sullivan

Open Access Theses & Dissertations

The purpose of this study was to determine the impact of Baby Sign on the pragmatic development of typically developing children. The participants for the study were 11 typically developing children. A one group pretest posttest case study design was used to evaluate the impact of baby sign. Prior to parents and caregivers attending a 5 week course on baby sign language, each child was administered the Developmental Assessment of Young Children (DAYC). Although, measurements were taken of the child's social, cognitive, physical, adaptive, and communication skills, standard scores of only the social subtests from the pretest to the posttest …

Effects Of Augmentative And Alternative Device On Echolalia In Autism, Cynthia Valenzuela

Open Access Theses & Dissertations

This study was a systematic replication of Mueller and Forbes (n.d.), which evaluated the effects of a high-tech and low-tech augmentative alternative communication (AAC) device on reducing echolalia in a verbal child with autism during conversational speech. The participant for this study was a verbal eleven-year male, who was diagnosed with autism prior to the study. A single subject alternating treatment research design was used to evaluate the effect of a high-tech speech generating AAC device (Proloquo2go) on echolalia. The participant was seen periodically twice a week for two months and periodically for one month. A functional analysis(Prizant & Rydell, …

An Approach To Power Efficiency Determination In The Solar Energy Systems Using Central Composite Design And Box-Behnken Design, Juan Venegas Mendez

Open Access Theses & Dissertations

We are living in an industrialized world that relies on fossil fuels. The ways, in which these fossil fuels have damaged the earth, in special the environment is worth of special attention and corrective actions. In our days, the climate change (global warming) it is becoming the number one topic. These changes are affecting our health, comfort and our way of living. Solar systems have been working among us since several years, but the truth is that most of us really don't understand how they work and more important, how they work in time in different conditions. Solar panels are …

Societal Power Shifts And Changing Social Identities In South Africa: Workplace Implications, Lize A. E. Booysen

Faculty Articles

The enormous social, economic and political transformation South Africans have experienced especially over the past 12 years, since the systematic dismantling of apartheid in the era of social and economic reconstruction, has brought about numerous societal and social identity changes. Due to these changes in social identity, societal norms and power shifts, major changes are occurring in the workplace, and societal level identity crises and conflicts are increasingly spilling over into the workplace. This article unpacks these social identity changes and power shifts on the political, social, economic and management levels, by employing social identity theory, self-categorisation theory and embedded …

Teachers' Perceptions Of The Availability And Need Of A Support Program For Students With Learning Difficulties Attending Elementary Schools In The Atlantic Union Conference, Lileth Althea Coke

Dissertations

Purpose of the Study. Support programs have been known to be very effective in helping students succeed academically, socially, behaviorally, and emotionally. The purpose of this study was to investigate teachers' perceptions of the availability and need of a support program for students with learning difficulties who attend elementary schools operated by the Atlantic Union (AU) Conference. The study also identified elements of a support program that teachers perceived as both available and necessary for the academic growth and development of these students.

Method. This study employed a survey research methodology in which survey questionnaires were used to gather information …

The Influence Of University Personnel Upon Students' Spirituality At Selected Adventist Universities In West Africa, Isaiah Ola Abolarin

Dissertations

Problem and Purpose. The Seventh-day Adventist Church has a deep concern for youth and young adults' spirituality. Hence the church established institutions of higher learning with the aim of restoring in youth and young adults the image of God in which they were created. There are programs and activities in these institutions to accomplish the aim, but there is still concern among church leaders and parents that young people will abandon their faith and exit the church. This study explored the influence of interactions between students and university personnel in selected Adventist universities in West Africa that, apart from programs …

Narratives Of The Leadership Development Of Adults Who Served As Summer Camp Staff In The Mennonite Setting : A Multiple Case Study, Jason Harrison

Dissertations

Problem. Leaders today need a new set of knowledge and skills to be effective in collaborative environments. The focus of this study was to investigate how collaborative environments can contribute to leadership development. The purpose of this study was to describe how the collaborative environment of summer camp helped shape emerging adults as leaders. The summer camp setting is inherently collaborative and, therefore, can inform and develop leaders for future collaborative settings. The research question in focus for this study was, How do adults who served at a summer camp as emerging adults describe the experiences that helped shape them …

Does Criminal Diversion Contribute To The Vanishing Civil Trial?, John B. Meixner Jr., Shari Seidman Diamond

Scholarly Works

Through his seminal work on the vanishing trial, Professor Marc Galanter has had a profound impact on public and scholarly discourse about the role of the trial in litigation, documenting the sharp reductions in the rate of civil cases since the mid-twentieth century. While there is little remaining doubt that the American civil trial is an increasingly scarce commodity, there is still much debate as to what has caused the decline.

In this Article, we seek to explore the extent to which the federal criminal docket may be contributing to the rapid disappearance of the civil trial by taking priority …

Error Costs & Ip Law, Joseph S. Miller

Scholarly Works

A court in doubt about an ip statute’s scope can err in two ways. It can wrongly narrow the ip right’s reach, or wrongly broaden it. The latter error, however, is worse: A wrongly broadened ip statute effectively creates new property. To correct erroneous broadening, unlike erroneous narrowing, the legislature must thus eliminate a now-established property right. And that is very hard to do. Courts cannot, of course, avoid making at least some mistakes. Courts can, however, prefer the mistakes that are easier, not harder, for the legislature to correct. This essay explores this error-cost-based approach to ip statutes, as …

Death Panels And The Rhetoric Of Rationing, Elizabeth Weeks Leonard

Scholarly Works

This essay offers an explanation for the United States' continued resistance to universal health care as grounded in two taboos: taxation and rationing. Even we were willing to pay more in taxes to directly subsidize the cost of medical care for those in need, rather than our current system of indirect subsidization through private insurance risk-pooling and cost-shifting, we still would face the unavoidable reality of resource limitations. Attempts to limit resource consumption, however, have been strongly opposed, as evidenced by the "death panels" controversy. Governor Palin's grossly erroneous characterization of the Patient Protection and Affordable Care Act (ACA) rendered …

The Outside Investor: Citizen Shareholders & Corporate Alienation, Anne M. Tucker

Scholarly Works

This Article explores the creation and conundrum of citizen shareholders-investors who enter the securities market primarily through employer- sponsored defined-contribution plans, invest in mutual or index funds, and are saving for long-term goals like retirement. Citizen shareholders are a consequence of a retirement revolution, and are the fastest growing group of investors. Citizen shareholders are distinguishable from other shareholders on the grounds of choice, exit, and the number of intermediaries inserted into the investment chain in defined-contribution plans. They are largely missing from corporate policy and scholarship debates; few discussions have incorporated the growing reality that shareholder status has changed …

Retirement Revolution: Unmitigated Risks In The Defined Contribution Society, Anne M. Tucker

Scholarly Works

A revolution in the retirement landscape over the last several decades shifted the predominant savings vehicle from traditional pensions (defined benefit plans) to self-directed accounts in defined contribution plans like the 401(k) and has drastically changed how people invest in the stock market and why. The prevalence of these self-directed accounts has created our defined contribution society and a new class of investors-the citizen shareholders-who enter the private securities market through self-directed retirement plans, invest for long-term savings goals, and are predominately indirect shareholders. With 90 million Americans invested in mutual funds, and nearly 75 million who do so through …

A Response To Beyond Separation: Professor Copeland’S Ambitious Proposal For “Integrative” Federalism, Elizabeth Weeks

Scholarly Works

No abstract provided.