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The Effect Of Nonlinear Propagation On Near-Field Acoustical Holography, Micah Raymond Shepherd Aug 2007

The Effect Of Nonlinear Propagation On Near-Field Acoustical Holography, Micah Raymond Shepherd

Theses and Dissertations

Near-field acoustical holography (NAH) has been used extensively for acoustical imaging of infinitesimal-amplitude (or small-amplitude) sources. However, recent interests are in the application of NAH to image finite-amplitude (or high-amplitude) sources such as jets and rockets. Since NAH is based on linear equations and finite-amplitude sources imply nonlinear effects, which cause shock formation and consequently an altered spectral shape, a feasibility study is carried out to determine the effect of nonlinear propagation on NAH. Jet and rocket sources typically have a distinct spectral shape resembling a ‘haystack’ and center frequencies varying from 30 to 300 Hz. To test the effect …

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Syntactic Attrition In L2 Mandarin Speakers, Shu Pei Wang Aug 2007

Syntactic Attrition In L2 Mandarin Speakers, Shu Pei Wang

Theses and Dissertations

The purpose of this study was to explore how syntactic skill was maintained or lost by L2 Mandarin Chinese learners over time. In addition, this study endeavored to discover how a learner's L1 affects the attrition process of word order in Mandarin Chinese. To find out how certain Chinese syntactic structures were subject to attrition over time and how syntactic errors could be attributed to L1 transfer, five types of Chinese syntax that either resembled English, were very different from English, or had no counterpart in English were selected. They included subject-verb-object sentences, modifiers before modified, time and other adverbial …

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Authentic Out-Of-Class Communication In Study Abroad Programs: Success Defined By Continued Motivation And Cultural Appreciation, Erin Fairlight Olsen Aug 2007

Authentic Out-Of-Class Communication In Study Abroad Programs: Success Defined By Continued Motivation And Cultural Appreciation, Erin Fairlight Olsen

Theses and Dissertations

The benefits of study abroad experience in second language acquisition have evolved from unchallenged assumption to the focus of rigorous study in the past several decades. The benefits of out-of-class contact with natives have likewise been questioned. Despite conflicting evidence of its benefit, students frequently cite out-of-class conversations with natives as among the most beneficial aspects of their language acquisition experience. Reviewing the extant literature, this study narrows in on authentic communication-that is, meaningful out-of-class contact with natives, in which students are able to genuinely express themselves and their personality-as a previously unanalyzed element of study abroad research. It is …

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Differential Response Of Various Spore Species To Sporicidal Disinfectants, Michael David Pratt Aug 2007

Differential Response Of Various Spore Species To Sporicidal Disinfectants, Michael David Pratt

Theses and Dissertations

In the fall of 2001, letters laced with anthrax spores were delivered to various news organizations in New York and Florida, as well as to two Senators in Washington, D.C. Over 22 anthrax infections and five deaths resulted from exposure to these spores, and decontamination of the affected buildings was both time consuming and costly. Since these attacks, interest in sporicidal disinfectants has increased greatly. Many chemical sporicidal disinfectants are available commercially, but the exposure time required to sterilize can be relatively long. In addition, some spores are simply injured or inhibited by chemical disinfectants, but not necessarily killed. Studies …

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A Comparative Study Of Muhammad And Joseph Smith In The Prophetic Pattern, Todd J. Harris Aug 2007

A Comparative Study Of Muhammad And Joseph Smith In The Prophetic Pattern, Todd J. Harris

Theses and Dissertations

As early as 1831, critics attacked Joseph Smith by comparing him to Muhammad. Over time, the comparison deepened as critics and scholars observed doctrinal and political similarities between Mormonism and Islam. Later, scholars compared Joseph Smith to Muhammad because both had generated a new religion and there seemed to be several similarities in the lives of Joseph Smith and Muhammad. These and other comparisons between the two men and their religions have been made from 1831 to the present, yet there have been few thorough, non-polemic examinations of Joseph Smith and Muhammad in the typology of prophethood. While notable similarities …

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The Spillable Environment: Expanding A Handheld Device's Screen Real Estate And Interactive Capabilities, Jeffrey S. Clement Aug 2007

The Spillable Environment: Expanding A Handheld Device's Screen Real Estate And Interactive Capabilities, Jeffrey S. Clement

Theses and Dissertations

Handheld devices have a limited amount of screen real estate. If a handheld device could take advantage of larger screens, it would create a more powerful user interface and environment. As time progresses, Moore's law predicts that the computational power of handheld devices will increase dramatically in the future, promoting the interaction with a larger screen. Users can then use their peripheral vision to recognize spatial relationships between objects and solve problems more easily with this integrated system. In the spillable environment, the handheld device uses a DiamondTouch Table, a large, touch-sensitive horizontal table, to enhance the viewing environment. When …

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Understanding The Feelings, Perceptions, And Attitudes Of Students Who Participate In A Service Study Abroad Program, Jennifer Jean Jackson Aug 2007

Understanding The Feelings, Perceptions, And Attitudes Of Students Who Participate In A Service Study Abroad Program, Jennifer Jean Jackson

Theses and Dissertations

This study was designed to understand the experience of being a service study abroad student. It examined feelings, perceptions and attitudes that developed as students from Brigham Young University participated in a service-centered study abroad program to Guadalajara, Mexico. The study enumerates participants' initial, developing, and final impressions during service study abroad and shows that students go through an extensive process of discovering, reformulating, and solidifying their attitudes and perceptions as they interpret their experiences. The study examined factors related to language and culture, but focused on the service component of the program. It found that service study abroad participants …

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An Adaptive Bayesian Approach To Bernoulli-Response Clinical Trials, Andrew W. Stacey Aug 2007

An Adaptive Bayesian Approach To Bernoulli-Response Clinical Trials, Andrew W. Stacey

Theses and Dissertations

Traditional clinical trials have been inefficient in their methods of dose finding and dose allocation. In this paper a four-parameter logistic equation is used to model the outcome of Bernoulli-response clinical trials. A Bayesian adaptive design is used to fit the logistic equation to the dose-response curve of Phase II and Phase III clinical trials. Because of inherent restrictions in the logistic model, symmetric candidate densities cannot be used, thereby creating asymmetric jumping rules inside the Markov chain Monte Carlo algorithm. An order restricted Metropolis-Hastings algorithm is implemented to account for these limitations. Modeling clinical trials in a Bayesian framework …

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The Relationship Between Pragmatic Language And Behavior Subtypes In Typically Developing Children, Lisa Jeppson Christensen Aug 2007

The Relationship Between Pragmatic Language And Behavior Subtypes In Typically Developing Children, Lisa Jeppson Christensen

Theses and Dissertations

This study examines the relationship between syntactic and pragmatic language and reticence, solitary-active passive withdrawal, solitary-passive withdrawal, prosocial skills, and likeability. The Children's Communication Checklist (CCC-2), a language checklist, and Teacher Behavior Rating Scale (TBRS), a behavior checklist, were completed by three 2nd-grade teachers and three 4th-grade teachers about each of their students. Factor analysis was used to determine two composite language measures from the CCC-2 scales. The results of two hierarchal regression analyses indicated that social behaviors were significant predictors of pragmatic language, but not structural language. In particular, solitary-passive withdrawal and reticence were significant predictors of pragmatic language …

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Maternal High-Salt Diet During Pregnancy In Sprague Dawley Rats Programs Exaggerated Stress-Induced Blood Pressure And Heart Rate Responses In Adult Female Offspring, Summer Hayes King Aug 2007

Maternal High-Salt Diet During Pregnancy In Sprague Dawley Rats Programs Exaggerated Stress-Induced Blood Pressure And Heart Rate Responses In Adult Female Offspring, Summer Hayes King

Theses and Dissertations

The prenatal environment has been shown to have lasting effects on cardiovascular health. In the present study, pregnant rats were fed a 0.7% NaCl normal salt (NS) diet or an 8% NaCl high salt (HS) diet throughout pregnancy. Adult offspring were fitted with radiotelemetry probes to continuously measure blood pressure and heart rate. Rats were placed in restraining cages to test for a programmed acute stress hyperresponsiveness. Offspring were challenged with HS diet for one week to determine if blood pressure salt sensitivity had been programmed by the prenatal HS diet. Animals were killed following resting and acute stress conditions, …

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Associations Between Shyness And Internalizing Behaviors, Externalizing Behaviors, And Relationships During Emerging Adulthood, Larry J. Nelson, Laura M. Padilla-Walker, Sarah Badger, Carolyn Mcnamara Barry, Jason S. Carroll, Stephanie D. Madsen Aug 2007

Associations Between Shyness And Internalizing Behaviors, Externalizing Behaviors, And Relationships During Emerging Adulthood, Larry J. Nelson, Laura M. Padilla-Walker, Sarah Badger, Carolyn Mcnamara Barry, Jason S. Carroll, Stephanie D. Madsen

Faculty Publications

Many studies have documented the ways in which shyness can be a barrier to personal well-being and social adjustment throughout childhood and adolescence; however, less is known regarding shyness in emerging adulthood. Shyness as experienced during emerging adulthood may continue to be a risk factor for successful development. The purpose of this study was to compare shy emerging adults with their non-shy peers in (a) internalizing behaviors, (b) externalizing behaviors, and (c) close relationships. Participants included 813 undergraduate students (500 women, 313 men) from a number of locations across the United States. Results showed that relatively shy emerging adults, both …

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Text Identification By Example, Daniel Joseph Preece Aug 2007

Text Identification By Example, Daniel Joseph Preece

Theses and Dissertations

The World-Wide Web contains a lot of information and reading through the web pages to collect this information is tedious, time consuming and error prone. Users need an automated solution for extracting or highlighting the data that they are interested in. Building a regular expression to match the text they are interested in will automate the process, but regular expressions are hard to create and certainly are not feasible for non-programmers to construct. Text Identification by Example (TIBE) makes it easier for end-users to harvest information from the web and other text documents. With TIBE, training text classifiers from user-selected …

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Compartmentalization Of Hiv-1 In The Secondary Lymphoid Tissues, James Peter Gregson Aug 2007

Compartmentalization Of Hiv-1 In The Secondary Lymphoid Tissues, James Peter Gregson

Theses and Dissertations

Follicular dendritic cells (FDCs) reside in the lymphoid follicles of the secondary lymphoid tissues (sLTs). Following the infection of an individual with human immunodeficiency virus type 1 (HIV-1), viral particles are trapped in massive quantities on the surfaces of FDCs. HIV-1 viral compartments are cell types or tissues between which there is a restriction of virus flow. Compartmentalization of HIV-1 creates numerous sites within the body in which the virus can undergo independent evolution, giving rise to a more diverse total viral population. Given the sessile nature of the FDC, I hypothesized that contrary to common assumptions, FDC-trapped HIV-1 is …

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Decentralized Control Of Multiple Uavs For Perimeter And Target Surveillance, Derek B. Kingston Jul 2007

Decentralized Control Of Multiple Uavs For Perimeter And Target Surveillance, Derek B. Kingston

Theses and Dissertations

With the recent development of reliable autonomous technologies for small unmanned air vehicles (UAVs), the algorithms utilizing teams of these vehicles are becoming an increasingly important research area. Unfortunately, there is no unified framework into which all (or even most) cooperative control problems fall. Five factors that affect the development of cooperative control algorithms are objective coupling, communication, completeness, robustness, and efficiency. We classify cooperative control algorithms by these factors and then present three algorithms with application to target and perimeter surveillance and a method for decentralized algorithm design. The primary contributions of this research are the development and analysis …

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Sampling Methods In Ray-Based Global Illumination, David Cline Jul 2007

Sampling Methods In Ray-Based Global Illumination, David Cline

Theses and Dissertations

In computer graphics, algorithms that attempt to create photographic images by simulating light transport are collectively known as Global Illumination methods. The most versatile of these are based on ray tracing (following ray paths through a scene), and numerical integration using random or quasi-random sampling. While ray tracing and sampling methods in global illumination have progressed much in the last two decades, the goal of fast and accurate simulation of light transport remains elusive. This dissertation presents a number of new sampling methods that attempt to address some of the shortcomings of existing global illumination algorithms. The first part of …

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Junior High Students' Perceptions Of The Fitnessgram Fitness Test, Emily Mcomber Welch Jul 2007

Junior High Students' Perceptions Of The Fitnessgram Fitness Test, Emily Mcomber Welch

Theses and Dissertations

The Fitnessgram is a battery of fitness tests designed for children and adolescents. These tests include aerobic capacity, body composition, muscle strength and endurance, and flexibility. Students are not compared to each other, rather to health fitness standards, specific to age and gender, which indicate good health. The purpose of this study was to identify student perceptions of the Fitnessgram fitness test. This study used surveys (N=82), and follow-up focus-group interviews (N=16) to identify student perceptions of the Fitnessgram fitness test. Results using the constant comparative method revealed three major categories: (1) students' perceptions of the purpose of fitness testing, …

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Transitions Between Hover And Level Flight For A Tailsitter Uav, Stephen R. Osborne Jul 2007

Transitions Between Hover And Level Flight For A Tailsitter Uav, Stephen R. Osborne

Theses and Dissertations

Vertical Take-Off and Land (VTOL) Unmanned Air Vehicles (UAVs) possess several desirable characteristics, such as being able to hover and take-off or land in confined areas. One type of VTOL airframe, the tailsitter, has all of these advantages, as well as being able to fly in the more energy-efficient level flight mode. The tailsitter can track trajectories that successfully transition between hover and level flight modes. Three methods for performing transitions are described: a simple controller, a feedback linearization controller, and an adaptive controller. An autopilot navigational state machine with appropriate transitioning between level and hover waypoints is also presented. …

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Longitudinal Course Of Body Dissatisfaction In Undergraduate Females At Brigham Young University, Joy Wiechmann Jul 2007

Longitudinal Course Of Body Dissatisfaction In Undergraduate Females At Brigham Young University, Joy Wiechmann

Theses and Dissertations

This research project examined the longitudinal course of body dissatisfaction among undergraduate females at Brigham Young University (BYU) using the Body Satisfaction Questionnaire (BSQ).The research also examined what percentage of undergraduate females have BSQ ratings in the clinically significant range and whether body dissatisfaction ratings varied based on the environment in which the student lived. Results indicate that no significant change in body dissatisfaction occurred over time, nor did living environment appear to play a role in BSQ scores. Results also showed that at any given time over 34% of women on BYU campus have BSQ scores in the clinically …

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Fremont Finery: Exchange And Distribution Of Turquoise And Olivella Ornaments In The Parowan Valley And Beyond, Cady Brooke Jardine Jul 2007

Fremont Finery: Exchange And Distribution Of Turquoise And Olivella Ornaments In The Parowan Valley And Beyond, Cady Brooke Jardine

Theses and Dissertations

The Fremont tradition developed on the northern Colorado Plateau and eastern Great Basin between A.D. 1 and A.D. 1350 (Talbot 2000a). Research on exotics in the Fremont area, specifically turquoise and Olivella shell, has been sporadic until recently (Hughes and Bennyhoff 1986; McDonald 1994; Janetski 2002). In this thesis, I present new data on Olivella and turquoise artifacts found throughout the Fremont region, including the Parowan Valley sites, Nephi Mounds, and Kay's Cabin, as well as a spatial distribution of Olivella and turquoise in the Fremont area. I performed microprobe analysis on blue-green artifacts from Kay's Cabin and found most …

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Hero Or Tyrant: Images Of Julius Caesar In Selected Works From Vergil To Bruni, Sarah Marianne Loose Jul 2007

Hero Or Tyrant: Images Of Julius Caesar In Selected Works From Vergil To Bruni, Sarah Marianne Loose

Theses and Dissertations

Gaius Julius Caesar is not only the most well-known figure in Roman history, but he is also one of the most difficult to understand. Since his assassination, Caesar has played an important role in discussions of political power, imperial government, tyranny, and tyrannicide. While there have been literary treatments of Caesar from William Shakespeare to the present, little has been done to trace the image of Caesar through the Middle Ages and into the Renaissance. The present work attempts to fill that hole by examining portrayals of Caesar in medieval and early Renaissance texts. An examination of specific authors such …

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Thomas Carlyle, Fascism, And Frederick: From Victorian Prophet To Fascist Ideologue, Jonathon C. Mccollum Jul 2007

Thomas Carlyle, Fascism, And Frederick: From Victorian Prophet To Fascist Ideologue, Jonathon C. Mccollum

Theses and Dissertations

The Victorian Author Thomas Carlyle was in his day a meteoric voice but his popularity and reputation declined significantly due in part to his link to fascism. In the politically polarized era of the Second World War, academics and propagandists dubbed him a fascist or Nazi in both defamation and approval. Fascist scholars pressed Carlyle into service as a progenitor and prophet of their respective totalitarian regimes. Adolf Hitler, in his final days, assuaged his fears of his imminent fall with readings from Carlyle's History of Frederick the Great. This fascist connection to the once esteemed “Sage of Chelsea” marks …

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The Relationship Between Family Composition And Social Behavior For Students With Mild Disabilities In Schools, Amanda Clark Jul 2007

The Relationship Between Family Composition And Social Behavior For Students With Mild Disabilities In Schools, Amanda Clark

Theses and Dissertations

Previous research identifies significant differences in children's problem behavior across various family structures, particularly noting more challenging behaviors in children from single parent families. Utilizing a pre-existing data set of Behavioral Objective Sequence (BOS) scores, this study investigated teacher ratings of social behavioral skills in students with mild disabilities, focusing on differences between groups of students from a variety of family compositions. Results indicated no significant difference in social behavioral skills among children from different family groups, taking into account the student's age. The covariate of age was significant on each of six BOS subscales, suggesting that children develop and …

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Development Of A Multiple Microphone Probe Calibrator, Jonathan Reed Oldham Jul 2007

Development Of A Multiple Microphone Probe Calibrator, Jonathan Reed Oldham

Theses and Dissertations

This paper presents the theory, design, and validation of a microphone calibrator used to calibrate multiple microphones simultaneously. This work was done in conjunction with the development of an acoustic energy density probe, which was used to validate the calibrator. The probe uses multiple microphones to acquire the data needed to compute the acoustic energy density. The probe microphones are 0.006 m diameter electret microphones which typically do not have an ideal “flat" response over a wide range of frequencies as compared to precision condenser microphones. The probe microphone characteristics prompted the need for simultaneous, multi-microphone magnitude calibration. The idea …

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Contributions Of Family Leisure To Family Functioning Among Single-Parent Families, Laurel Beth Hornberger Jul 2007

Contributions Of Family Leisure To Family Functioning Among Single-Parent Families, Laurel Beth Hornberger

Theses and Dissertations

The purpose of this study was to examine the contribution of family leisure involvement to the family functioning of single-parent families among a large national representative sample. Two samples were gathered. The single-parent sample consisted of 384 families (384 parents and 384 youth). The dual-parent sample consisted of 495 families (495 parents and 495 youth). Data were analyzed from the parent, youth, and family perspective using two instruments. The Family Adaptability and Cohesion Scale (FACES II) was used to measure family functioning and the Family Leisure Activity Profile (FLAP) was used to measure family leisure involvement. Blocked multiple regression analysis …

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Discovering The Derivative Can Be "Invigorating:" Mark's Journey To Understanding Instantaneous Velocity, Charity Ann Gardner Hyer Jul 2007

Discovering The Derivative Can Be "Invigorating:" Mark's Journey To Understanding Instantaneous Velocity, Charity Ann Gardner Hyer

Theses and Dissertations

This is a case study using qualitative methods to analyze how a first semester calculus student named Mark makes sense of the derivative and the role of the classroom practice in his understanding. Mark is a bright yet fairly average student who successfully makes sense of the derivative and retains his knowledge and understanding. The study takes place within a collaborative, student-centered, task-based classroom where the students are given opportunity to explore mathematical ideas such as rate of change and accumulation. Mark's sense making of the derivative is analyzed in light of his use of physics, Mark as a visual …

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The Influence Of Performance Level And Setting On Collegiate Athletes' Motivational Profiles, Shareen Brooke Smith Jul 2007

The Influence Of Performance Level And Setting On Collegiate Athletes' Motivational Profiles, Shareen Brooke Smith

Theses and Dissertations

The purpose of this study was to determine if motivational profiles of individual collegiate team sport athletes differ across ability levels (High, Middle, and Low) and settings (Team Practice, Competition, and Personal Practice). The athletes task and ego disposition, autonomy, and contextual motivation, were assessed using the Perception of Success Questionnaire (POSQ), Sport Climate Questionnaire (SCQ), and Sport Motivational Scale (SMS), pre and postseason. Their anxiety levels and situational motivation were measured using the Sport Anxiety Scale (SAS) and the Situational Motivational Scale (SIMS) during the season. The General Causality Orientations Scale (GCOS) was used pre and postseason to assess …

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Trust Me, I'M The Principal! A New Conceptual Model Of Trust For Educational Leaders, Bryan W. Blair Jul 2007

Trust Me, I'M The Principal! A New Conceptual Model Of Trust For Educational Leaders, Bryan W. Blair

Theses and Dissertations

The ultimate aim of this work is to contribute to the knowledge of how trust influences and relates to those practices that best support student development and growth as educated and productive citizens, prepared to share in our democratic society-which is the ultimate purpose of our schools (Dewey & Dewey, 1915). Specifically, this thesis investigates the role of trust in relationships between school principals and teachers. A comparative analysis of available literature was conducted using grounded theory methodologies to inform the development of a proposed conceptual model describing the role of trust in organizational processes within the school, specifically between …

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An 828 Year Streamflow Reconstruction For The Jordan River Drainage Basin Of Northern Utah, Bryan P. Tikalsky Jul 2007

An 828 Year Streamflow Reconstruction For The Jordan River Drainage Basin Of Northern Utah, Bryan P. Tikalsky

Theses and Dissertations

Bryan Tikalsky Department of Geography Master of Science Mountain water resources are essential to those living along the Salt Lake City urban corridor. Water resource planners base their policy on twentieth century climate conditions and streamflow records. Often these records only account for a small amount of the natural variability in streamflow and climate. By utilizing dendrochronology this study seeks to better understand variability of streamflow in the Jordan River Drainage Basin over the last 828 years. A GIS model was used to identify potential sampling sites where tree growth would be sensitive to climate and factors affecting stream run-off. …

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Social Outcomes Of Students With Language Impairment: An Eight-Year Follow-Up Study, Meghan A. Baldridge Jul 2007

Social Outcomes Of Students With Language Impairment: An Eight-Year Follow-Up Study, Meghan A. Baldridge

Theses and Dissertations

This study re-examined the language and social skills of four females with language impairment who were initially studied eight years ago (Brinton, Fujiki, Montague, & Hanton, 2000; Fujiki, Brinton, Isaacson, & Summers, 2001). Language measures included the Clinical Evaluation of Language Fundamentals-Fourth Edition (Semel, Wiig, & Secord, 2003) and a thirty minute language sample. Social measures included the UCLA Loneliness Scale-Version 3 (Russell, 1996), parent, teacher and student forms of the Social Skills Rating System (Gresham & Elliott, 1990), and an interview with each participant's teacher or speech-language pathologist. Results of the current assessment were compared to results from the …

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Handling And Analysis Of Public Comments In Natural Resource Planning, Lisette Borchert Thurgood Jul 2007

Handling And Analysis Of Public Comments In Natural Resource Planning, Lisette Borchert Thurgood

Theses and Dissertations

The National Environmental Policy Act (NEPA) of 1970 required public input in any federal planning process or action. Consequently, natural resource planning can be characterized as more of a complex situation in recent years due to the increasing involvement of the number of constituents who want to be heard. Likewise, the public wants to know their ideas have been heard and considered. Unfortunately, there is very little information available which identifies how the BLM handles and analyzes public scoping comments that are required under NEPA. The purpose of this research is to identify the handling and analysis methodology used by …

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