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This thesis examines the modeling, analysis, and control system design issues for scramjet powered hypersonic vehicles. A nonlinear three degrees of freedom longitudinal model which includes aero-propulsion-elasticity effects was used for all analysis. This model is based upon classical compressible flow and Euler-Bernouli structural concepts. Higher fidelity computational fluid dynamics and finite elementmethods are needed formore precise intermediate and final evaluations. The methods presented within this thesis were shown to be useful for guiding initial control relevant design. The model was used to examine the vehicles static and dynamic characteristics over the vehicles trimmable region. The vehicle has significant longitudinal …

Contributors

Korad, Akshay Shashikumar, Rodriguez, Armando A, Tsakalis, Konstantinos S, et al.

Created Date

2010

Since scholars first turned their attention to the subject some eighty years ago, one major area of contention in the study of Anglo-Saxon wills has been the function of the written will within Anglo-Saxon culture. Verbal agreements, formalized through oral ceremonies and symbolic actions, were recognized as legally binding; however, many of these agreements were also recorded in writing. Many scholars argue that the written document was superfluous;oral ceremonies were written down only in the case of memory failure and the documents themselves had no real performative function. Others see the existence of the written will to be evidence of …

Contributors

Castle, Kasandra Marie, Bjork, Robert, Maring, Heather, et al.

Created Date

2010

Prognostics and health management (PHM) is a method that permits the reliability of a system to be evaluated in its actual application conditions. This work involved developing a robust system to determine the advent of failure. Using the data from the PHM experiment, a model was developed to estimate the prognostic features and build a condition based system based on measured prognostics. To enable prognostics, a framework was developed to extract load parameters required for damage assessment from irregular time-load data. As a part of the methodology, a database engine was built to maintain and monitor the experimental data. This …

Contributors

Varadarajan, Gayathri, Liu, Huan, Ye, Jieping, et al.

Created Date

2010

The following study evaluated the effectiveness of a self-monitoring strategy on independent work behavior. The three subjects were in first grade, seven years old, identified with mild mental retardation (MIMR), and had an Individualized Education Plan (IEP) with targeted functional academic and behavior goals. The purpose of this study was to investigate the effect of a self-monitoring strategy on on-task independent work behavior and task completion. The research sought to determine whether or not a self-monitoring strategy would affect on-task independent work behavior and task completion. A multiple baseline across subjects design was used. Data were collected using a frequency …

Contributors

Coughlin, Jennifer Henderson, Mccoy, Kathleen, Kenzer, Amy, et al.

Created Date

2010

Continuous advancements in biomedical research have resulted in the production of vast amounts of scientific data and literature discussing them. The ultimate goal of computational biology is to translate these large amounts of data into actual knowledge of the complex biological processes and accurate life science models. The ability to rapidly and effectively survey the literature is necessary for the creation of large scale models of the relationships among biomedical entities as well as hypothesis generation to guide biomedical research. To reduce the effort and time spent in performing these activities, an intelligent search system is required. Even though many …

Contributors

Kanwar, Pradeep, Davulcu, Hasan, Dinu, Valentin, et al.

Created Date

2010

The existing compact models can reproduce the characteristics of MOSFETs in the temperature range of -40oC to 125oC. Some applications require circuits to operate over a wide temperature range consisting of temperatures below the specified range of existing compact models, requiring wide temperature range compact models for the design of such circuits. In order to develop wide temperature range compact models, fourteen different geometries of n-channel and p-channel MOSFETs manufactured in a 0.18μm mixed-signal process were electrically characterized over a temperature range of 40 K to 298 K. Electrical characterization included ID-VG and ID-VD under different drain, body and gate …

Contributors

Kathuria, Achal, Barnaby, Hugh, Schroder, Dieter K, et al.

Created Date

2010

ABSTRACT This study explored the functions of dialogue in emerging adults' moral turning points. Through purposive sampling, the researcher interviewed 10 emerging adults between 25 and 30 years old about experiences of turning point conversations during the years of 18 and 25. This study employed constant comparative and grounded theory methodologies to analyze messages reported in memorable conversations during this period. Results indicated that dialogue functioned to educate, disturb, and maintain emerging adults' moral perception during this period of moral reorientation. Subcategories under each included dialogue that functioned to explain, invite, warn, direct or instruct, challenge, persuade, agitate, expose, inquire, …

Contributors

Danaher, Joshua, Waldron, Vincent R, Ramsey, Ramsey E, et al.

Created Date

2010

The purpose of this study was to explore current pedagogical approaches of undergraduate directing curricula in selected U.S. institutions of higher learning. Building on the work of Clifford Hamar and Anne Fliotsos, the thesis builds a foundation for further study of contemporary directing pedagogy. Fourteen course syllabi were collected voluntarily from members of The Association for Theatre in Higher Education (ATHE) and served at the primary source material. They were interpreted and analyzed qualitatively for components that identified the methods and philosophies of the instructor and/or institution. From these syllabi, the researcher found 11 "skill categories" which cover all potential …

Contributors

Welch, Peter Benjamin, Saldana, Johnny, Gharavi, Lance, et al.

Created Date

2010

The field of Structural Health Monitoring (SHM) has grown significantly over the past few years due to safety and performance enhancing benefits as well as potential life saving capabilities offered by technology. Current advances in SHM systems have lead to a variety of techniques capable of identifying damage. However, few strategies exist for using this information to quickly react to environmental or material conditions needed to repair or protect the system. Rather, current systems simply relay this information to a central processor or human operator who then decides on a course of action, such as altering the mission or scheduling …

Contributors

Garcia, Michael, Sodano, Henry A, Jiang, Hanqing, et al.

Created Date

2010

Electronic devices are gaining an increasing market share in the medical field. Medical devices are becoming more sophisticated, and encompassing more applications. Unlike consumer electronics, medical devices have far more limitations when it comes to area, power and most importantly reliability. The medical devices industry has recently seen the advantages of using Flash memory instead of Read Only Memory (ROM) for firmware storage, and in some cases to replace Electrically Programmable Read Only Memories (EEPROMs) in medical devices for frequent data storage. There are direct advantages to using Flash memory instead of Read Only Memory, most importantly the fact that …

Contributors

Hag, Eslam E., Kozicki, Michael N, Schroder, Dieter K, et al.

Created Date

2010

The U.S. Army Medical Command has been testing a leadership based structure to increase the performance of delivering construction and facility services in its system of $600M of construction and 26 major hospital facilities in the U.S. The organizational requirement was to minimize the management and oversight of contractors and simultaneously increase project performance. The research proposes that a leadership based structure can supplement the perception, preplanning, and risk minimization capability of a contractor's project manager, thus increasing the project performance (on time, within budget, and meeting expectations) and decreasing client management requirement. The projects were delivered in a best …

Contributors

Malhotra, Neha, Kashiwagi, Dean T, Sullivan, Kenneth, et al.

Created Date

2010

In the past, it has been assumed that measurement and predictive invariance are consistent so that if one form of invariance holds the other form should also hold. However, some studies have proven that both forms of invariance only hold under certain conditions such as factorial invariance and invariance in the common factor variances. The present research examined Type I errors and the statistical power of a method that detects violations to the factorial invariant model in the presence of group differences in regression intercepts, under different sample sizes and different number of predictors (one or two). Data were simulated …

Contributors

Olivera, Margarita, Millsap, Roger E., Aiken, Leona S., et al.

Created Date

2010

In the United States, recreational female golfers give up golf at twice the rate of recreational male golfers. This study explored the causal attributions of 240 recreational golfers after a practice session at a public golf facility. Attributions can be adaptive or maladaptive after a performance and can influence subsequent motivation to engage in a similar task again. It was hypothesized that male and female golfers would make significantly different attributions for their performance and that female golfers' attributions would be maladaptive. As the attrition rate for female golfers is highest in the first five years, it is also hypothesized …

Contributors

Shapcott, Susan, Husman, Jenefer, Brem, Sarah, et al.

Created Date

2010

The Resource Description Framework (RDF) is a specification that aims to support the conceptual modeling of metadata or information about resources in the form of a directed graph composed of triples of knowledge (facts). RDF also provides mechanisms to encode meta-information (such as source, trust, and certainty) about facts already existing in a knowledge base through a process called reification. In this thesis, an extension to the current RDF specification is proposed in order to enhance RDF triples with an application specific weight (cost). Unlike reification, this extension treats these additional weights as first class knowledge attributes in the RDF …

Contributors

Cedeno, Juan Pablo, Candan, Kasim S, Chen, Yi, et al.

Created Date

2010

An investigation of phase noise in amplifier and voltage-controller oscillator (VCO) circuits was conducted to show that active direct-current (DC) bias techniques exhibit lower phase noise performance than traditional resistive DC bias techniques. Low-frequency high-gain amplifiers like those found in audio applications exhibit much better 1/f phase noise performance and can be used to bias amplifier or VCO circuits that work at much higher frequencies to reduce the phase modulation caused by higher frequency devices. An improvement in single-side-band (SSB) phase noise of 15 dB at offset frequencies less than 50 KHz was simulated and measured. Residual phase noise of …

Contributors

Baldwin, Jeremy Bart, Aberle, James, Bakkaloglu, Bertan, et al.

Created Date

2010

The nature and correlates of emerging internalizing symptoms in young children are largely unknown. Maternal factors such as psychological symptoms and detached parenting style have been found to be present in children with anxiety and depression. Further, child attentional control in task completion has been associated with difficulty related to internalizing problems. This study tested hypotheses that child anxiety and depression at age five could be predicted by a combination of maternal distress and maternal detached behavior recorded at age three. An additional hypothesis was tested to determine if child attentional control at age four may be a partial mediator …

Contributors

Skelley, Shayna L., Crnic, Keith A, Eisenberg, Nancy, et al.

Created Date

2010

ABSTRACT Forgiveness is a response to moral wrongdoing motivated by moral reasons. Long thought to be the overcoming of resentment, I will present T.M. Scanlon's view that it is best understood as the decision to blame no longer, i.e. to give up the judgment that one's relationship with another is impaired. Forgiveness has been traditionally thought of as having its locus in the forgiver. However, this has led to a number of accounts in which forgiveness has been presented as a one-sided undertaking, compromising the interpersonal character of the act. I propose a different way of viewing forgiveness, namely as …

Contributors

D'Angelo, Cindy, De Marneffe, Peter L., Murphy, Jeffrie G., et al.

Created Date

2010

Biology textbooks are everybody's business. In accepting the view that texts are created with specific social goals in mind, I examined 127 twentieth-century high school biology textbooks for representations of animal development. Paragraphs and visual representations were coded and placed in one of four scientific literacy categories: descriptive, investigative, nature of science, and human embryos, technology, and society (HETS). I then interpreted how embryos and fetuses have been socially constructed for students. I also examined the use of Haeckel's embryo drawings to support recapitulation and evolutionary theory. Textbooks revealed that publication of Haeckel's drawings was influenced by evolutionists and anti-evolutionists …

Contributors

Wellner, Karen Linette, Maienschein, Jane, Ellison, Karin D., et al.

Created Date

2010

Celiac Disease (CD) is now widespread as one in 133 people are currently diagnosed, while there were only one in 150 in 2006. Much of the research concerning CD is still in the early stages, as formal epidemiological studies are relatively recent. CD is aggravated by the consumption of gluten, which is found mainly in wheat, rye, oats, and barley. Not surprisingly, the rising prevalence of CD has created a significant business opportunity for food manufacturers in developing products that are tailored to CD sufferers. While the entire Gluten-Free (GF) industry has been experiencing double digit growth rates, the expansion …

Contributors

Sampson, Jed, Richards, Timothy, Manfredo, Mark, et al.

Created Date

2010

ABSTRACT This thesis attempts to answer two questions based upon the historical observation that 1^2 +2^2 +· · ·+24^2 = 70^2. The first question considers changing the starting number of the left hand side of the equation from 1 to any perfect square in the range 1 to 10000. On this question, I attempt to determine which perfect square to end the left hand side of the equation with so that the right hand side of the equation is a perfect square. Mathematically, Question #1 can be written as follows: Given a positive integer r with 1 less than or …

Contributors

Roth, Sanford Gary, Bremner, Andrew, Childress, Nancy E, et al.

Created Date

2010

The Culminating Graduate Works of David Dudo. Dissertation/Thesis

Contributors

Dudo, David, Sterling, Pamela, Mcmahon, Jeffery, et al.

Created Date

2010

The Wechsler Intelligence Scale for Children-Fourth Edition (WISC-IV) General Abilities Index (GAI) and Cognitive Proficiency Index (CPI) have been advanced as possible diagnostic markers of Attention-Deficit Hyperactivity Disorder (ADHD). Diagnostic utility statistics were used to test the ability of GAI-CPI difference scores to identify children with ADHD. Participants included an ADHD sample (n = 78), a referred but non-diagnosed hospital sample (n = 66), and a simulated sample with virtually identical psychometric characteristics as the WISC-IV 2,200 child standardization sample. Receiver Operating Characteristic (ROC) analyses were computed to determine the utility of GAI-CPI difference scores to identify children with ADHD. …

Contributors

Devena, Sarah Elaine, Watkins, Marley W, Wodrich, David L, et al.

Created Date

2010

Thermal modeling and investigation into heat extraction methods for building-applied photovoltaic (BAPV) systems have become important for the industry in order to predict energy production and lower the cost per kilowatt-hour (kWh) of generating electricity from these types of systems. High operating temperatures have a direct impact on the performance of BAPV systems and can reduce power output by as much as 10 to 20%. The traditional method of minimizing the operating temperature of BAPV modules has been to include a suitable air gap for ventilation between the rooftop and the modules. There has been research done at Arizona State …

Contributors

Hrica, Jonathan, Tamizhmani, Govindasamy, Rogers, Bradley, et al.

Created Date

2010

This thesis documents the design history of the Riordan Mansion, and Arts and Crafts style duplex built in Flagstaff, Arizona in 1904 by brothers Michael and Timothy Riordan. The study investigates factors that influenced the design including the Riordan family; the location in Flagstaff, Arizona; the architect, Charles Whittlesey; the Arts and Crafts Movement, and other cultural influences such as religion, naturalism, exoticism, art, and literature. Exterior facade and interior plan, construction materials, technological advances, and furnishings all demonstrate Arts and Crafts characteristics and key principles of the design reform movement. Design reform began in the 1860s with a rejection …

Contributors

Klensin, Katherine Lee, Brandt, Beverly, Fahlman, Betsy, et al.

Created Date

2010

In rural and urban areas of Nigeria, dependence on groundwater is increasing since the population is growing and high quality, treated municipal water is scarce. Municipal drinking water is often compromised because of old and leaking distribution pipes. About 58% of the water consumed in Lagos State, Nigeria, comes from residential wells. However, a majority of residential wells are shallow wells that are constructed relatively close to septic tanks or pit latrines and are therefore subject to contamination. In certain parts of Africa, there is high potential of severe epidemic if water quality is not improved. With increasing reliance on …

Contributors

Talabi, Omogbemiga Adepitan, Edwards, David, Hild, Nicholas, et al.

Created Date

2010

Horizontal Directional Drilling (HDD) is a growing and expanding trenchless method utilized to install pipelines from 2 to 60 inch diameters for lengths over 10,000 foot. To date, there are not many public documents where direct costs and bid prices incurred by HDD installations are available and analyzed. The objective is to provide a better understanding of the factors affecting the bid prices of these projects. The first section of the thesis analyzes how project parameters such as product diameter, bore length and soil conditions affect the bid price of water and wastewater pipeline installations using HDD. Through multiple linear …

Contributors

Vilfrant, Emmania Claudyne, Ariaratnam, Samuel T, Lueke, Jason S, et al.

Created Date

2010

Micromachining has seen application growth in a variety of industries requiring a miniaturization of the machining process. Machining at the micro level generates different cutter/workpiece interactions, generating more localized temperature spikes in the part/sample, as suggested by multiple studies. Temper-etch inspection is a non-destructive test used to identify `grind burns' or localized over-heating in steel components. This research investigated the application of temper-etch inspection to micromachined steel. The tests were performed on AISI 4340 steel samples. Finding, indications of localized over-heating was the primary focus of the experiment. In addition, change in condition between the original and post-machining hardness in …

Contributors

Sayler, William Albert, Biekert, Russ, Danielson, Scott, et al.

Created Date

2010

For this thesis a Monte Carlo simulation was conducted to investigate the robustness of three latent interaction modeling approaches (constrained product indicator, generalized appended product indicator (GAPI), and latent moderated structural equations (LMS)) under high degrees of nonnormality of the exogenous indicators, which have not been investigated in previous literature. Results showed that the constrained product indicator and LMS approaches yielded biased estimates of the interaction effect when the exogenous indicators were highly nonnormal. When the violation of nonnormality was not severe (symmetric with excess kurtosis < 1), the LMS approach with ML estimation yielded the most precise latent interaction …

Contributors

Cham, Hei Ning, West, Stephen G, Aiken, Leona S, et al.

Created Date

2010

The Jon Finn Group, a four-piece instrumental rock band based in Boston, MA, was in need of a website redesign, http://JonFinn.com. They required a website to showcase and sell their music and merchandise, promote upcoming performances, interact directly with their fans, integrate with social networking websites, and administer paid membership subscriptions via a content management system. Making this possible required an overhaul of the website, which was based almost entirely on static HTML files with limited capabilities for dynamic content updates. The band also requested a complete visual design overhaul compatible with traditional desktop computer web browsers, cell phone-based web …

Contributors

Garone, Anthony, Schildgen, Thomas, Lestar, Dorothy, et al.

Created Date

2010

This project is a critical look at Chicano artist Vincent Valdez's 2002-2004 series Stations. The theoretical framework for this work is the concept of cultural citizenship, which refers to a variety of ways in which marginalized groups of people create, fight for, and retain space, identity, and rights within American society through acts of daily life. This research considers how the ten large-scale charcoal drawings that comprise Stations contribute to the construction and representation of distinct and unique Latino spaces and identities. Valdez establishes space in the sense of belonging and community engagement that his work allows. Within this context, …

Contributors

Stemm Patel, Shannon Leigh, Malagamba-Ansótegui, Amelia, Mesch, Claudia, et al.

Created Date

2010

Cloud computing systems fundamentally provide access to large pools of data and computational resources through a variety of interfaces similar in spirit to existing grid and HPC resource management and programming systems. These types of systems offer a new programming target for scalable application developers and have gained popularity over the past few years. However, most cloud computing systems in operation today are proprietary and rely upon infrastructure that is invisible to the research community, or are not explicitly designed to be instrumented and modified by systems researchers. In this research, Xen Server Management API is employed to build a …

Contributors

Kadne, Aniruddha Kishor, Huang, Dijiang, Tsai, Wei-Tek, et al.

Created Date

2010

ABSTRACT Ongoing research into wireless transceivers in the 60 GHz band is required to address the demand for high data rate communications systems at a frequency where signal propagation is challenging even over short ranges. This thesis proposes a mixer architecture in Complementary Metal Oxide Semiconductor (CMOS) technology that uses a voltage controlled oscillator (VCO) operating at a fractional multiple of the desired output signal. The proposed topology is different from conventional subharmonic mixing in that the oscillator phase generation circuitry usually required for such a circuit is unnecessary. Analysis and simulations are performed on the proposed mixer circuit in …

Contributors

Martino, Todd Jeffrey, Kiaei, Sayfe, Bakkaloglu, Bertan, et al.

Created Date

2010

This thesis presents a multi-modal motion tracking system for stroke patient rehabilitation. This system deploys two sensor modules: marker-based motion capture system and inertial measurement unit (IMU). The integrated system provides real-time measurement of the right arm and trunk movement, even in the presence of marker occlusion. The information from the two sensors is fused through quaternion-based recursive filters to promise robust detection of torso compensation (undesired body motion). Since this algorithm allows flexible sensor configurations, it presents a framework for fusing the IMU data and vision data that can adapt to various sensor selection scenarios. The proposed system consequently …

Contributors

Liu, Yangzi, Qian, Gang, Olson, Loren, et al.

Created Date

2010

Natural Language Processing is a subject that combines computer science and linguistics, aiming to provide computers with the ability to understand natural language and to develop a more intuitive human-computer interaction. The research community has developed ways to translate natural language to mathematical formalisms. It has not yet been shown, however, how to automatically translate different kinds of knowledge in English to distinct formal languages. Most of the recent work presents the problem that the translation method aims to a specific formal language or is hard to generalize. In this research, I take a first step to overcome this difficulty …

Contributors

Alvarez Gonzalez, Marcos, Baral, Chitta, Lee, Joohyung, et al.

Created Date

2010

This thesis looks at the 1842 Supreme Court ruling of Prigg v. Pennsylvania, the events leading up to this case, and the subsequent legislative fallout from the decision. The Supreme Court rendered this ruling in an effort to clear up confusion regarding the conflict between state and federal law with regard to fugitive slave recovery. Instead, the ambiguities contained within the ruling further complicated the issue of fugitive slave recovery. This complication commenced when certain state legislatures exploited an inadvertent loophole contained in the ruling. Thus, instead of mollifying sectional tension by generating a clear and concise process of fugitive …

Contributors

Coughlin, John Kevin, Schermerhorn, Calvin, O'Donnell, Catherine, et al.

Created Date

2010

Spatial uncertainty refers to unknown error and vagueness in geographic data. It is relevant to land change and urban growth modelers, soil and biome scientists, geological surveyors and others, who must assess thematic maps for similarity, or categorical agreement. In this paper I build upon prior map comparison research, testing the effectiveness of similarity measures on misregistered data. Though several methods compare uncertain thematic maps, few methods have been tested on misregistration. My objective is to test five map comparison methods for sensitivity to misregistration, including sub-pixel errors in both position and rotation. Methods included four fuzzy categorical models: fuzzy …

Contributors

Brown, Scott Benjamin, Wentz, Elizabeth A., Myint, Soe W., et al.

Created Date

2010

ABSTRACT Diné Education is equal and is as valid as this nation's mainstream education, yet it does not share the same ideas, processes or goals as its counterpart. It is more complicated because it is based on oral traditions and the philosophies of Hózhó, a construct that requires a learner to embrace one's surroundings, actions, interactions, and being. A central part of Diné education focuses on spirituality and self awareness which are intertwined with every dimension of this universe. In order to become educated in the Diné world a learner must first learn to "walk in beauty" and have a …

Contributors

Neezzhoni, Dmitriy Zoxjkie, Romero-Little, Mary Eunice, Brayboy, Bryan, et al.

Created Date

2010

A study was conducted to assess the effects of generational status on various measures of stigmatization, acculturative stress, and perceived social and interpersonal threat within the Mexican heritage population in the Southwest. The role of the fear of stigma by association, regardless of actual experiences of stigmatization, was investigated, including its relationships with acculturative stress, perceived threat, and social distancing. Exploratory analyses indicated that first generation Mexican Americans differed significantly from second generation Mexican Americans on the perception of Mexican nationals as ingroup members, the fear of stigma by association by Americans, and levels of acculturative stress. Additional analyses indicated …

Contributors

Boyd, Brenna Margaret, Knight, George P, Kwan, Sau, et al.

Created Date

2010

Power rating photovoltaic modules at six irradiance and four temperature matrix levels of IEC 61853-1 draft standard is one of the most important requirements to accurately predict energy production of photovoltaic modules at different climatic conditions. Two studies were carried out in this investigation: a measurement repeatability study and a translation procedure validation study. The repeatability study was carried out to define a testing methodology that allows generating repeatable power rating results under outdoor conditions. The validation study was carried out to validate the accuracy of the four translation procedures: the first three procedures are from the IEC 60891 standard …

Contributors

Paghasian, Karen Yuag, Tamizhmani, Govindasamy, Madakannan, Arunachalandar, et al.

Created Date

2010

The Maricopa produce one of the most recognizable types of pottery made in Arizona. Since the late nineteenth century, the ware has been manufactured for sale, and a small number of individuals continue to produce the pottery today. Over the past forty years, the amount of pottery in museum and private collections has increased dramatically. Studying these new collections changes the way in which developments in the pottery are understood. Previous scholarship identified three phases of development, including a pottery revival in the late 1930s during which the involvement of government and museum personnel resulted in the improvement of the …

Contributors

Vogel, Lindsey Lianne, Warren-Findley, Jannelle, Dallett, Nancy, et al.

Created Date

2010

In this thesis two methodologies have been proposed for evaluating the fault response of analog/RF circuits. These proposed approaches are used to evaluate the response of the faulty circuit in terms of specifications/measurements. Faulty response can be used to evaluate important test metrics like fail probability, fault coverage and yield coverage of given measurements under process variations. Once the models for faulty and fault free circuit are generated, one needs to perform Monte Carlo sampling (as opposed to Monte Carlo simulations) to compute these statistical parameters with high accuracy. The first method is based on adaptively determining the order of …

Contributors

Subrahmaniyan Radhakrishnan, Gurusubrahmaniyan, Ozev, Sule, Blain Christen, Jennifer, et al.

Created Date

2010

Modern gas turbines operate at high mainstream gas temperatures and pressures, which requires high durability materials. A method of preventing these hot gases from leaking into the turbine cavities is essential for improved reliability and cost reduction. Utilizing bleed-off air from the compressor to cool internal components has been a common solution, but at the cost of decreasing turbine performance. The present work thoroughly describes the complex flow field between the mainstream gas and a single rotor-stator disk cavity, and mechanisms of mainstream gas ingestion. A combined approach of experimental measurement and numerical simulation are performed on the flow in …

Contributors

Dunn, Dennis Martin, Squires, Kyle D, Roy, Ramendra P, et al.

Created Date

2010

Implantable medical device technology is commonly used by doctors for disease management, aiding to improve patient quality of life. However, it is possible for these devices to be exposed to ionizing radiation during various medical therapeutic and diagnostic activities while implanted. This commands that these devices remain fully operational during, and long after, radiation exposure. Many implantable medical devices employ standard commercial complementary metal-oxide-semiconductor (CMOS) processes for integrated circuit (IC) development, which have been shown to degrade with radiation exposure. This necessitates that device manufacturers study the effects of ionizing radiation on their products, and work to mitigate those effects …

Contributors

Schlenvogt, Garrett James, Barnaby, Hugh J, Goodnick, Stephen, et al.

Created Date

2010

The gender gap of women in science is an important and unresolved issue in higher education and occupational opportunities. The present study was motivated by the fact that there are typically fewer females than males advancing in science, and therefore fewer female science instructor role models. This observation inspired the questions: Are female college students influenced in a positive way by female science teaching assistants (TAs), and if so how can their influence be measured? The study tested the hypothesis that female TAs act as role models for female students and thereby encourage interest and increase overall performance. To test …

Contributors

Ebert, Darilyn, Lawson, Anton, Maienschein, Jane, et al.

Created Date

2010

Market acceptability of distributed energy resource (DER) technologies and the gradual and consistent increase in their depth of penetration have generated significant interest over the past few years. In particular, in Arizona and several other states there has been a substantial in-crease in distributed photovoltaic (PV) generation interfaced to the power distribution systems, and is expected to continue to grow at a significant rate. This has made integration, control and optimal operation of DER units a main area of focus in the design and operation of distribution systems. Grid-connected, distributed PV covers a wide range of power levels ranging from …

Contributors

Narayanan, Anand, Ayyanar, Raja, Vittal, Vijay, et al.

Created Date

2010

The RADiation sensitive Field Effect Transistor (RADFET) has been conventionally used to measure radiation dose levels. These dose sensors are calibrated in such a way that a shift in threshold voltage, due to a build-up of oxide-trapped charge, can be used to estimate the radiation dose. In order to estimate the radiation dose level using RADFET, a wired readout circuit is necessary. Using the same principle of oxide-trapped charge build-up, but by monitoring the change in capacitance instead of threshold voltage, a wireless dose sensor can be developed. This RADiation sensitive CAPacitor (RADCAP) mounted on a resonant patch antenna can …

Contributors

Srinivasan Gopalan, Madusudanan, Barnaby, Hugh, Holbert, Keith, et al.

Created Date

2010

Photovoltaic (PV) modules appear to have three classifications of failure: Infant mortality, normal-life failure, and end-of-life failure. Little is known of the end-of-life failures experienced by PV modules due to their inherent longevity. Accelerated Life Testing (ALT) has been at the crux of this lifespan prediction; however, without naturally failing modules an accurate acceleration factor cannot be determined for use in ALT. By observing modules that have been aged in the field, a comparison can be made with modules undergoing accelerated testing. In this study an investigation on about 1900 aged (10-17 years) grid-tied PV modules installed in the desert …

Contributors

Suleske, Adam Alfred, Tamizhmani, Govindasamy, Rogers, Bradley, et al.

Created Date

2010

Cuisines are becoming increasingly significant in a tourist's experience and as such looking into different cuisines and their effects on the tourist's destination provides strong indicators of the outlook for the destination. Metropolitan areas within the United States have a history of being known for specific food items as well as types of cuisines. This study explores the Metropolitan area of New Orleans and the cuisine specific to this region: the Creole cuisine. A mixed methods approach was used to identify the Creole cuisine within the New Orleans area as both a regional cuisine and as a culturally significant cuisine, …

Contributors

Seery, Paul, Tyrrell, Timothy, Timothy, Dallen, et al.

Created Date

2010

Silicon Carbide (SiC) junction field effect transistors (JFETs) are ideal for switching high current, high voltage loads in high temperature environments. These devices require external drive circuits to generate pulse width modulated (PWM) signals switching from 0V to approximately 10V. Advanced CMOS microcontrollers are ideal for generating the PWM signals but are limited in output voltage due to their low breakdown voltage within the CMOS drive circuits. As a result, an intermediate buffer stage is required between the CMOS circuitry and the JFET. In this thesis, a discrete silicon-on-insulator (SOI) metal semiconductor field effect transistor (MESFET) was used to drive …

Contributors

Summers, Nicholas Burton, Thornton, Trevor J, Goryll, Michael, et al.

Created Date

2010

Sparked by the Virginia Tech Shooting of 2007 and the resultant changes to the Family Educational Rights and Privacy Act, a review was conducted of FERPA's impact on university policies regarding student privacy and safety. A single, private university's policies were reviewed and a survey was distributed to 500 campus employees who had recently completed the university's FERPA training to determine if the university's current training was effective in training employees to understand FERPA's health and safety exceptions clause. The results showed that while the university's training was effective in training employees how to safeguard students' academic records, employees did …

Contributors

Gilbert, Byron J., Edwards, David A., Hild, Nicholas R., et al.

Created Date

2010