Digital Commons Network^™

The Role Of Automatic Reinforcement In Early Speech Acquisition, Barbara E. Esch

Dissertations

No abstract provided.

Materials And Processes For Printed Electronics: Evaluation Of Gravure Printing In Electronics Manufacture, Erika Hrehorova

Dissertations

The primary goal of printing electronics is to create structures and devices that are functionally similar to conventional electronics, but at greater speed, lower cost and less production complexity. There are advantages and challenging disadvantages of using printing processes to manufacture electronic devices. Printing has been very well optimized for printing visual images that meet the requirements of human eye. However in the production of functional electronic devices, there are more stringent requirements on resolution, registration and quality of printed features and functional layers.

The main goal of this work is to form a starting point to a bigger picture …

Inelastic X-Ray Scattering Studies On Organic Semiconductors And Organic Superconductors, Chaminda Nalaka Kodituwakku

Dissertations

We have measured electronic excitations and excitons in CuPc polycrystalline and single crystal samples. Measurements on the polycrystalline sample were done with 300 meV resolution and measurements on the single crystal were done using 120 meV resolution. Time dependant density functional theory (TD-DFT) calculations were done on the CuPc molecule to understand the electronic excitations in this system.

A Role Of Problem-Solving In Complex Intraverbal Repertoires, Rachael A. Sautter

Dissertations

kinner described intraverbal behavior as verbal behavior with no point-to-point correspondence between the stimulus and the response. This verbal operant encompasses a wide range of response topographies ranging from answering simple questions to complex conversational exchanges. Previous interventions for teaching complex responding to questions about category membership have focused primarily on transfer of stimulus control procedures to teach specific intraverbal responses. These procedures have proven effective at establishing basic intraverbal responses but have consistently produced small and somewhat restricted repertoires. Theoreticians have hypothesized that effective use of problem-solving strategies rather than simple stimulus control may account for the performance of …

Problems Related To Efficacy Measurement And Analyses, Sibabrata Banerjee

Dissertations

In clinical research it is very common to compare two treatments on the basis of an efficacy variable. More specifically, if X and Y denote the responses of patients on the two treatments A and B, respectively, the quantity P(Y>X) (which can be called the probabilistic index for the Effect Size), is of interest in clinical statistics. The objective of this study is to derive an efficacy measure that would compare two treatments more informatively and objectively compared to the earlier approaches. Kernel density estimation is a useful non-parametric method that has not been well utilized as an applied …

The Impact Of Combined Maternal Alcohol And Tobacco Use On Low Birth Weight In Singleton Pregnancies : A Population Based Study In The Us, 2003, Della A. Campbell

Dissertations

Background: The Black-White disparity in birth outcomes in the United States remains embedded. The World Health Organization (WHO) defines low birth weight (LBW) as birthweight less than 2500 grams/5.5 pounds or below the 10th percentile for gestational age. LBW is a frequent marker of poor maternal/infant health outcome. A reduction in the incidence of LBW is a major public health initiative in the US. Objective: The objective of the study was to determine the magnitude of risk for low birth weight, defined in this study as neonatal birth weight less than 2500 grams, in relation to combined maternal alcohol and …

Prediction Of Mrna Polyadenylation Sites In The Human Genome And Mathematical Modeling Of Alternative Polyadenylation, Yiming Cheng

Dissertations

Messenger RNA (mRNA) polyadenylation plays many important roles in the cell, such as transcription termination, mRNA stability and transportation, and mRNA translation in eukaryotic cells. A large number of human and mouse genes have multiple polyadenylation sites (referred to as poly(A) sites) that lead to variable transcripts, some of which are translated into various protein products with different functions. However, the details about when and where the polyadenylation occurs, and how pre-mRNA switches from one poly(A) site to another are still unknown. This kind of 3 '-end processing can be regulated by the cell environment, cell cycle stage, and tissue …

Sifting Customers From The Clickstream : Behavior Pattern Discovery In A Virtual Shopping Environment, Peishih Chang

Dissertations

While shopping online, customers' needs and goals may change dynamically, based on a variety of factors such as product information and characteristics, time pressure and perceived risk. While these changes create emergent information needs, decisions about what information to present to customers are typically made before customers have visited a web site, using data such as purchase histories and logs of web pages visited. Better understanding of customer cognition and behavior as a function of various factors is needed in order to enable the right information to be presented at the right time. One approach to achieving this understanding is …

Formation Of Rdx Nanoparticles By Rapid Expansion Of Supercritical Solution : In Situ Characterization By Laser Scattering, Takuya Matsunaga

Dissertations

Cyclo-1,3,5-trimethylene-2,4,6-trinitramine (RDX), a well-known energetic material, is highly explosive. Reduction of the sensitivity of RDX is desired for safe handling and

storage in military applications. Data on the sensitivity of RDX in the 10-1000 µm crystal size range suggested that the impact sensitivity could be further reduced by reduction of the crystal size to the sub-micron or nano-scale (Armstrong, 1990). Recent research with nano-RDX obtained using Rapid Expansion of Supercritical Solutions (RESS) confirmed these expectations (Stepanov, 2005).

RESS process appeared to be one out of a few techniques of production of nanoscale energetic materials free of the risk of explosion. …

Synthesis And Analysis Of Reactive Nanocomposites Prepared By Arrested Reactive Milling, Swati M. Umbrajkar

Dissertations

Different types of reactive nanocomposites have been synthesized by Arrested Reactive Milling (ARM). The technical approach was to increase the interface area available for heterogeneous reaction between solid fuel and oxidizer components. Using aluminum as the main fuel and different metal oxides as oxidizers, highly energetic reactive nanocomposites with different degrees of structural refinement were synthesized. Specifically, stoichiometric Al-MoO₃, Al-CuO, and Al-NaNO₃ material systems were studied in detail.

The correlation of heterogeneous exothermic reactions occurring in the nanocomposite powders upon their heating at low rates and ignition events observed for the same powders heated rapidly was of …

Long Exposure Point Spread Function Estimation From Solar Adaptive Optics Loop Data, Jose Marino

Dissertations

Adaptive optics (AG) systems provide partial correction to wavefront distortions introduced by the Earth's atmosphere. They have become an essential tool to obtain diffraction-limited observations from ground-based telescopes. However, the AG correction is only partial and post-processing with a good estimate of the point spread function (PSF) is required.

PSF estimates are impossible to measure directly during solar observations due to the lack of point sources in the field-of-view. Moreover, the highly variable day-time seeing conditions require the estimated PSF to be simultaneous with the captured image. A method is presented to estimate the long-exposure PSF of AG-corrected solar observations …

Construction Of Fasr Subsystem Testbed And Application For Solar Burst Trajectories And Rfi Study, Zhiwei Liu

Dissertations

The construction of the Frequency Agile Solar Radiotelescope (FASR) Subsystem Testbed (FST) and observational results are described. Three antennas of Owens Valley Solar Array (OVSA) have been upgraded with newly designed, state of art technology. The 1-9 GHz RF signal from the antenna feed is transmitted via broadband (45 MHz-9.5 GHz) optical fiber links to the control room. The RF is then downconverted to a 500 MHz, single-sideband signal that can be tuned across the 1-9 GHz RF band. The data are sampled with an 8-bit, 1 GHz sampling-rate digitizer, and further saved to a computer hard disk. The full-resolution …

Reliability Studies Of Tin/Hf-Silicate Based Gate Stacks, Naser Ahmed Chowdhury

Dissertations

Hafnium-silicate based oxides are among the leading candidates to be included into the first generation of high-Κ gate stacks in nano-scale CMOS technology because of their distinct advantages as far as thermal stability, leakage characteristics, threshold stability and low mobility degradation are concerned. Their reliability, which is limited by trapping at pre-existing and stress induced defects, remains to be a major concern.

Energy levels of electrically active ionic defects within the thick high-Κ have been experimentally observed in the context of MOS band diagram for the first time in Hf-silicate gate stacks from low temperature and leakage measurements. Excellent match …

Central And Peripheral Autonomic Influences : Analysis Of Cardio-Pulmonary Dynamics Using Novel Wavelet Statistical Methods, Anne Marie Petrock

Dissertations

The development and implementation of novel signal processing techniques, particularly with regard to applications in the clinical environment, is critical to bringing computer-aided diagnoses of disease to reality. One of the most confounding factors in the field of cardiac autonomic response (CAR) research is the influence of the coupling of respiratory oscillations with cardiac oscillations.

This research had three objectives. The first was the assessment of central autonomic influence over heart rate oscillations when the pulmonary system is damaged. The second was to assess the link between peripheral and central autonomic control schema by evaluating the heart rate variability (HRV) …

Design And Performance Of Cdma Codes For Multiuser Communications, Radharani Poluri

Dissertations

Walsh and Gold sequences are fixed power codes and are widely used in multiuser CDMA communications. Their popularity is due to the ease of implementation. Availability of these code sets is limited because of their generating kernels. Emerging radio applications like sensor networks or multiple service types in mobile and peer-to-peer communications networks might benefit from flexibilities in code lengths and possible allocation methodologies provided by large set of code libraries.

Walsh codes are linear phase and zero mean with unique number of zero crossings for each sequence within the set. DC sequence is part of the Walsh code set. …

In Vitro Studies Of Degradation And Bioactivity Of Aliphatic Polyesther Composites, Georgia Chouzouri

Dissertations

In spite of numerous publications on the potential use of combinations of aliphatic polyester composites containing bioactive fillers for bone regeneration, little information exists on the combined in vitro mechanisms involving simultaneously diffusion for polymer degradation and bioactivity through nucleation and growth of apatite in simulated body fluid (SBF) solution. The objective of this study is to contribute to the understanding of the fundamentals in designing non-porous, solid materials for bone regeneration, from experimental data along with their engineering interpretation.

Bioactivity, in terms of apatite growth, was assessed through several experimental methods such as scanning electron microscopy (SEM), energy dispersive …

Comparative Immune Function In Wild Birds, Kevin David Matson

Dissertations

Over the last several decades, interest in quantifying immune function in comparative studies of wild animals has grown appreciably. Now, the field of ecological immunology is undergoing a transition, and ¿second generation¿ studies are being designed and carried out. With a greater appreciation of the complexity of immune systems, these second generation studies are commonly distinguished from their antecedents by making comparisons using multiple assays and including multiple species. I worked to advance this transition by developing novel approaches to comparative immunology, exploring the interrelationships among indices of immune function, and applying multiple indices to a question of comparative avian …

Challenges Of Administering A Sino-U.S. Joint Venture Campus In China, Osman Ozturgut

Dissertations

Abstract With the recent globalization movement and decline in foreign student enrollment in universities in developed countries like the U.S., universities are looking for ways to bring education to the student rather than waiting for students to come for education. Therefore, opening a branch campus abroad and bringing education to the student became an alternative for U.S. universities to bringing students to their campuses. This qualitative study explored the political, economic, socio-cultural, and educational challenges of administering a Sino-U.S. joint-venture campus in the People¿s Republic of China. China American University (CAU) is an educational joint venture between China Investment Company …

An Empirical Study Of Employee Relations And Managerial Malpractice Risks In A Four-Year Public Higher Education System, Robert Lee Brown Edd

Dissertations

Over the last decade, the rapid rise in college tuitions and fees has become a national priority, with congressional committees and scholars interested in solving this persistently stubborn and often intractable problem. Although a number of reasons for this phenomenon have been discussed, one theoretically plausible but untested explanation involves the extent to which campus climate may be empirically linked to the costs of managing various legal claims against the university, including workers' compensation, employment practice, and stress claims. To test the empirical validity of this hypothesis, this study gathered campus climate and claims data from 23 campuses and 25 …

Integrating Total Disability Management In A Climate Of Change: A Case Study, Mary E. Jesko Edd

Dissertations

Integrated disability management (IDM) is a cost-containment strategy increasingly being employed by human resources and risk management departments to address occupational and non-occupational illness and injury in a consistent manner. The goal is to both reduce on-the-job injury and minimize the loss of work time due to injury or illness. Although a large number of organizations have embraced the IDM concept, implementing IDM often is difficult because of the complex array of contracts, policies, procedures, corporate cultures and structures. Although extensive research has examined leaders' influence on change in various types of businesses, to date, research has not specifically explored …

Experiences Of Sacramental Marriage, James Patrick O'Brien Edd

Dissertations

This study interprets the stories told by eight couples about their experiences approaching marriage as a religious sacrament. The eight couples represented a purposeful sample selected using the following criteria: (a) They self-identified as having a sacramental marriage within the Roman Catholic tradition; (b) they appeared to be information rich sources who could provide an emic, i.e., an insider, view of the sacramental marriage experience; (c) they participated in the Catholic Cursillo movement; (d) they engaged in observable religious practices; and (e) they parented children. Research methods included guided conversation, participant observation, and a timeline activity that asked participants to …

Teachers' Perceptions Of A 360-Degree Feedback Process, Catriona Collins Moran Edd

Dissertations

In recent years, the 360° feedback process, which originated in the business world in the 1980s, has been increasingly used for the purpose of teacher evaluation. When this is done, feedback from peers, parents and students, as well as teacher self-reflection and student achievement data, are used in addition to more traditional evaluation strategies. Despite its growing popularity, however, there have been very few published studies about the impact of the 360° feedback process in the business world and even fewer in the field of education. The overarching purpose of this qualitative study was to discover teachers' perceptions of a …

Effect Of Computer-Aided Instruction On Grades In Middle School Algebra, Patricia A. Taepke Edd

Dissertations

Computers and targeted software are increasingly common in the middle school algebra classroom, but the efficacy of computer-aided instruction on classroom achievement in middle school algebra remains unclear. Participants were 1452 middle-school algebra students who were seldom, occasionally, or often exposed to the algebra modules of Destination Math, an interactive mathematics software designed to be appropriate for in-school use. Data were collected over three years (2002–04) and included the cooperation of the algebra teachers, who were subsequently interviewed. Data were analyzed with ANOVA, ANCOVA, and multiple regression. Statistically significant effects were localized using pairwise tests with Bonferroni correction for multiple …

Building Management Bench Strength: A Qualitative Look At A Job Rotation Program, Paige Litton Creager Phd

Dissertations

Job rotation programs are known in the organizational development field as one of the primary components used in a successful employee development program. To date little research has gone beyond the quantifiable reporting of practices. The view of program participants has been unaccounted for, and consequently the organizational development field has lacked a holistic understanding of how employees succeed and fail in these programs. This research offers a current perspective on job rotation: A means of accelerating the development of high potential employees in order to build a strong management bench. A qualitative grounded theory approach was used to investigate …

Emerging Elements Of Leadership In A Complex System: A Cognitivist Approach, Kirsten Suzanne Hanson Edd

Dissertations

As our world grows increasingly complicated at an intensified pace, leaders must be facile managers of complexity if organizations and society are to productively and peacefully evolve. Today’s global corporations are microcosms of complexity and have the potential to affect life for almost all other species. However, many organizations have not yet become aware of themselves as “living” and still operate as industrial age institutions with rationalist thinking traditionally dominating management practice. Many factors impact an organization’s overall effectiveness. Yet, executive leaders are seen as having the ability to influence change and play a vital role in helping people navigate …

Examining Stage Theories And The Predisposition To Lead Within The Homosexual Community, David Robert Blair Edd

Dissertations

An application of homosexual stage-based self-integration theory suggests that until gay individuals have become fully self-integrated, their capacity for leadership within the community is diminished. Unfortunately, now more than ever before, leadership is needed in dealing with such pressing community issues as the disproportionately high suicide rate among gay teens, the ongoing struggle for gays to become fully self-integrated individuals, bringing equal rights to the gay population, and of course, developing a base of strong gay leaders to meet the ongoing challenges facing this population. To test the self-integration-leadership hypothesis, this study surveyed 150 men in gay Internet chat rooms …

Geophysical Monitoring Probes And Their Applications To Some Hydrogeological Problems, Laura Smart

Dissertations

Geophysical monitoring probes were constructed to monitor the vertical changes of water content and ion concentration in the subsurface. These devices contain electrodes for resistivity measurements and thermistors for temperature measurements. They are designed to monitor the resistivity and temperature of the saturated zone, the transition zone, and the vadose zone near a groundwater/surface water interface. Additional installations at the site include four monitoring wells and four Time Domain Reflectometry (TDR) access tubes, each paired with the geophysical probe installations. Pole-Pole resistivity measurements with an a-spacing of 5 cm are made using a CR1000 Campbell Scientific, Inc. datalogger. Automated data …

What’S So Hard About Algebra? A Grounded Theory Study Of Adult Algebra Learners, Michael Steele Reese Edd

Dissertations

In California community colleges, fewer than half of students who enroll in basic algebra courses finish with a grade of C or better. Such a low success rate creates an intense demand on institutional resources, including faculty efforts, tutorial services, classroom availability, and financial aid. Furthermore, students who do poorly in algebra also tend to struggle in other quantitative courses. While research suggests that child algebra learners tend to exhibit specific misconceptions, not much is known about misconceptions held by adult algebra learners. Research does indicate, however, that certain general learning characteristics are common among adult learners. The present study …

Autobiography As Counter-Narrative: An Empirical Study Of How Race Enters And Structures The Stories Of Our Lives, Wendy B. Yanow

Dissertations

The primary purpose of this study was to learn about how race enters and then structures the narratives of our life experiences. Critical Race Theory (CRT) was used as a lens through which to examine learning autobiographies and the CRT methodology of counter-storytelling was used to illustrate the ways in which race enters and structures the stories of our lives.

The data consist of personal narratives written by adult students who were not asked to consider their life experiences from a racialized perspective. That resulted in a level of authenticity of their voices. Analyzing the learning autobiographies through a CRT …

The High School Play, Kevin Drzakowski

Dissertations

The High School Play is a creative work, a full-length play in three acts. Set in suburban Richard M. Nixon High School, the play explores the notion o f adolescent identity while satirizing the American educational system’s artificial construction o f these identities. The play is especially concerned with theatrically representing the way students view each other through flawed frameworks based on preconceived notions o f race, gender, sexuality, and intelligence, as well as how this behavior shapes adolescents’ construction o f their own self-conceptions. The High School Play also deals with the difficulty schools experience in addressing the increasingly …