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Articles 1 - 30 of 1552
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Equalization Of Loudspeakers And Enclosed Sound Fields, Xi Chen
Equalization Of Loudspeakers And Enclosed Sound Fields, Xi Chen
Theses and Dissertations
Equalization of loudspeakers and enclosed sound fields has been a topic of considerable interest for decades. Confusion has often arisen among audio professionals regarding the feasibility of simultaneously equalizing a loudspeaker and the enclosed field (i.e., the “room”) it excites. Because of frustrations encountered in such efforts, some have advocated abandoning simultaneous equalization altogether. This dissertation discusses the drawbacks of this approach as well as traditional in situ equalization methods. It demonstrates that many problems with traditional equalization stem from the use of measured acoustic pressure at a discrete point in a sound field as the system output. The dissertation …
Efficient Rotation Algorithms For Texture Evolution, Mark W. Esty
Efficient Rotation Algorithms For Texture Evolution, Mark W. Esty
Theses and Dissertations
Texture evolution is a vital component of many computational tools that link structure, properties and processes of polycrystalline materials. By definition, this evolution process involves the manipulation, via rotation, of points in orientation space. The computational requirements of the current methods being used to rotate crystalline orientations are a significant limiting factor in the drive to merge the texture information of materials into the engineering design process. The goal of this research is to find and implement a practical rotation algorithm that can significantly decrease the computation time required to rotate macroscopic and microscopic crystallographic textures. Three possible algorithms are …
Influence Of Soil Water Repellency On Post-Fire Revegetation Success And Management Techniques To Improve Establishment Of Desired Species, Matthew D. Madsen
Influence Of Soil Water Repellency On Post-Fire Revegetation Success And Management Techniques To Improve Establishment Of Desired Species, Matthew D. Madsen
Theses and Dissertations
The influence of soil water repellency (WR) on vegetation recovery after a fire is poorly understood. This dissertation presents strategies to broaden opportunities for enhanced post-fire rangeland restoration and monitoring of burned piñon and juniper (P-J) woodlands by: 1) mapping the extent and severity of critical and subcritical WR, 2) determining the influence of WR on soil ecohydrologic properties and revegetation success, and 3) evaluating the suitability of a wetting agent composed of alkylpolyglycoside-ethylene oxide/propylene oxide block copolymers as a post-fire restoration tool for ameliorating the effects of soil WR and increasing seedling establishment. Results indicate that:
• Post-fire patterns …
Transparency And City Government Communications, Jennalande Oswald
Transparency And City Government Communications, Jennalande Oswald
Theses and Dissertations
This study expresses the need for a communications model created specifically for government communications that is centered on the concept of transparency. However, it also recognizes the previous research done pertaining to government communications and public relations. Importantly, the study recognizes the lack of trust in American government at city, state and federal levels and the need to improve trust, which is very closely related to transparency. The study focuses primarily on a model created in 2007 called the three-dimensional model for government communications. The model has four parts: the base of the model is the need to value transparency; …
A Closer Look At One Elementary School's Use Of Informational Text In Classroom Instruction, Marjean Sorensen
A Closer Look At One Elementary School's Use Of Informational Text In Classroom Instruction, Marjean Sorensen
Theses and Dissertations
The purpose of this action research study was to explore the use of informational text in kindergarten through sixth grade classrooms in one elementary school. The research was based on analyzing responses given by teachers on a self-report survey; which addressed various aspects of their use of informational texts. The survey included questions about the sources teachers used to find informational texts, the criteria used in selection of such texts, and the frequency and purposes for informational text use. These data were then compared according to teachers' years of teaching experience and grade level taught to see the influence of …
Carbon Coated Tellurium For Optical Data Storage, Jonathan D. Abbott
Carbon Coated Tellurium For Optical Data Storage, Jonathan D. Abbott
Theses and Dissertations
A highly durable optical disk has been developed for data archiving. This optical disk uses tellurium as the write layer and carbon as a dielectric and oxidation prevention layer. The sandwich style CTeC film was deposited on polycarbonate and silicon substrates by plasma sputtering. These films were then characterized with SEM, TEM, EELS, ellipsometry, ToF-SIMS, etc, and were tested for writability and longevity. Results show the films were uniform in physical structure, are stable, and able to form permanent pits. Data was written to a disk and successfully read back in a commercial DVD drive.
Division Of Household Labor: Changes Over The Course Of The Marital Relationship, Christopher W. Matteson
Division Of Household Labor: Changes Over The Course Of The Marital Relationship, Christopher W. Matteson
Theses and Dissertations
Previous research has established the influence of the division of household labor between spouses on marital satisfaction, as well as the mental health of each spouse. Less is known about how the division of labor changes during the course of marriage. The family development perspective suggests that division of labor will change in response to different stages and circumstances, while the homeostasis perspective suggests that the division of labor will remain stable throughout the life course. This study used data from a 35 year longitudinal study of married women to examine changes of household division of labor over the life …
Development Of A Methodology For Numerical Simulation Of A D C Arc Discharge In A Liquid Dielectric, Christopher James Lewis
Development Of A Methodology For Numerical Simulation Of A D C Arc Discharge In A Liquid Dielectric, Christopher James Lewis
Theses and Dissertations
The majority of literature regarding the numerical simulation of arc discharges in gaseous environments has used a plasma physics approach. Virtually all simulations treat the discharge as an idealized gaseous plasma, which can be described by temperature, pressure, and electric field. This approach can work well if the media is a shielding gas such as Argon; however, the approach does not work well for processes such as underwater welding, EDM, and underwater discharges used to generate high purity particles. The reason these discharges do not have many extensive simulation efforts as described in the literature is because they occur in …
Passive Earth Pressures On A Pile Cap With A Dense Sand Backfill, Robert Ashall Marsh
Passive Earth Pressures On A Pile Cap With A Dense Sand Backfill, Robert Ashall Marsh
Theses and Dissertations
Pile groups are often used to provide support for structures. Capping a pile group further adds to the system's resistance due to the passive earth pressure from surrounding backfill. While ultimate passive earth pressure under static loading conditions can be readily calculated using several different theories, the effects of cyclic and dynamic loading on the passive earth pressure response are less understood. Data derived from the full-scale testing of a pile cap system with a densely compacted sand backfill under static, cyclic, and dynamic loadings was analyzed with particular focus on soil pressures measured directly using pressure plates. Based on …
Inferring Dispersal Of Aquatic Invertebrates From Genetic Variation: A Comparative Study Of An Amphipod (Talitridae Hyalella Azteca) And Mayfly (Baetidae Callibaetis Americanus) In Great Basin Springs, Heather Lynn Stutz
Theses and Dissertations
Whether active or passive, dispersal accompanied by gene flow shapes the population genetics and evolutionary divergence of species. Indirect methods which use genetic markers have the ability to assess effective dispersal—that which resulted in gene flow. My objective was to see if an aquatic insect and an obligate aquatic invertebrate show similar phylogeographic patterns and genetic uniqueness. Hyalella azteca and Callibaetis americanus were collected from 4-5 springs in each of six basins in the Great Basin of western North America. No dispersal or genetic studies of C. americanus have been conducted to date. However, several studies focusing on mtDNA diversity …
Computational Modeling Of Biochemical Systems Using Cellular Automata, Advait Apte
Computational Modeling Of Biochemical Systems Using Cellular Automata, Advait Apte
Theses and Dissertations
Biological systems exhibit complex behaviors through coordinated responses of individual biological components. With the advent of genome-scale techniques, one focus has been to develop methods to model interactions between components to accurately describe intact system function. Mathematical modeling techniques such as constraint-based modeling, agent-based modeling, cellular automata (CA) modeling and differential equation modeling are employed as computational tools to study biological phenomenon. We have shown that cellular automata simulations can be used as a computational tool for 12 predicting the dynamics of biological systems with stochastic behavior. The basic premise for the research was the observations made during a study …
Antibiotic Use By Members Of The American Association Of Endodontics: A National Survey For 2009- A Follow Up From The Report In 1999, Pye Kyu
Theses and Dissertations
The purpose of this study was to determine the changes in prescribing habits of active members of American Association of Endodontics (AAE) with regards to antibiotics in comparison to the findings reported by Yingling et al. in 1999. The invitations to take the online survey were sent via email to 2593 active members. A response rate of 37.75% was obtained. It was determined to be adequate for analysis and for comparison to the results obtained by Yingling et al. Comparisons between the percentages shown in this survey and the previous survey were tested using a z-test. An ANOVA model was …
Energy Dissipation Caused By Asphalt Roadway Gouges For Use In Accident Reconstruction, Charles L. Crosby
Energy Dissipation Caused By Asphalt Roadway Gouges For Use In Accident Reconstruction, Charles L. Crosby
Theses and Dissertations
In reconstruction of on-roadway vehicle accidents, roadway surface gouges and the forces and energy attributed to the related vehicle components become important keys to resolving an accurate accident reconstruction. These roadway gouge forces vary depending upon such factors as surface temperature and the velocity and geometry of the gouging mechanism. Accounting for the forces applied to vehicle components and the energy dissipated from such forces can be helpful in accident reconstruction where supporting data exists. This research documents the force necessary to create a given roadway gouge geometry. Controlled pavement gouging tests were performed using roadway surface temperature and gouging …
Acoustic Mediation Of Vocalized Emotion Identification: Do Decoders Identify Emotions Idiographically Or Nomothetically?, Michael Kenneth Lauritzen
Acoustic Mediation Of Vocalized Emotion Identification: Do Decoders Identify Emotions Idiographically Or Nomothetically?, Michael Kenneth Lauritzen
Theses and Dissertations
Most research investigating vocal expressions of emotion has focused on one or more of three questions: whether there exist unique acoustic profiles of individual encoded emotions, whether the nature of emotion expression is universal across cultures, and how accurately decoders can identify expressed emotions. This dissertation begins to answer a fourth question, whether there exist unique patterns in the types of acoustic properties persons focus on to identify vocalized emotions. Three hypotheses were tested: first, whether acoustic patterns are interpreted idiographically or nomothetically as reflected in a comparison of individual vs. group lens model identification ratios; second, whether there exists …
Comparison Of Single-Use And Multiple-Use Electrodes For Sensory, Motor Threshold Amplitudes And Force Production, Lucia Maloy
Comparison Of Single-Use And Multiple-Use Electrodes For Sensory, Motor Threshold Amplitudes And Force Production, Lucia Maloy
Theses and Dissertations
Context: Electrodes play an important role in interfacing tissue with electrical stimulation devices. Manufacturers recommend that adhesive metallic mesh cloth electrodes be used no more than 10 times before they are discarded, however, clinically the electrodes are often used up to 30 times. Another concern is sanitation. When electrodes are used on different patients, there is a chance for cross-contamination and bacterial growth on the electrode. Objective: To compare amplitudes of perceived sensation, motor twitch and force produced at specific amplitudes using single-use electrodes that run no risk of cross-contamination, and multiple-use electrodes. Design: Mixed model ANOVA with the subject …
Finite Element Modeling Of Plasticity Induced Crack Closure And A Mechanics Based Study Of Crack Closure Measurement Techniques, Marcos Lugo
Theses and Dissertations
From its discovery, crack closure was recognized as a key aspect in understanding the fatigue crack growth process. Considering the condition of plane stress, a vast amount of research has been conducted experimentally, analytically, and numerically to understand the complex process of fatigue crack growth and crack closure. Nonzero crack opening stress values are routinely observed, and it seems that there is a general agreement regarding the incidence of the phenomenon under plane stress. However, investigations regarding crack closure under plane strain conditions are less abundant. Moreover, the existence of crack closure under the plane strain state of the stress …
Pathogen Entrance And Development Of Disease During Infection Of The American Channel Catfish Ictalurus Punctatus By The Enterobacterium Edwardsiella Ictaluri, Simon Menanteau-Ledouble
Pathogen Entrance And Development Of Disease During Infection Of The American Channel Catfish Ictalurus Punctatus By The Enterobacterium Edwardsiella Ictaluri, Simon Menanteau-Ledouble
Theses and Dissertations
Since being first reported in the late 1980ies, the Enterobacterium Edwardsiella ictaluri has rose in prevalence to become one of the two most damaging pathogens affecting the channel catfish industry. Despite this significance of the pathogen, understanding of the development of the disease, especially its route of entry into the host and the earlier stages of the infection, is still incomplete. A series of challenges were conducted using bioluminescent E. ictaluri either by infecting fish through immersion or topical application of the bacteria directly on the intact or abraded epithelium. This showed that abraded fish developed septicemia and died faster …
Nutrient Management In On-Site Wastewater Treatment, Ayanangshu Dey
Nutrient Management In On-Site Wastewater Treatment, Ayanangshu Dey
Theses and Dissertations
Groundwater and surface water contamination has been linked in the past to inadequate or failing on-site wastewater treatment and disposal systems. The on-site wastewater systems installed in coastal areas have more potential for inflicting this kind of environmental damage. This work studied the regulatory compliance and environmental protection of the four types of on-site wastewater disposal systems found on the Mississippi Gulf Coast; i.e., vegetative rock filter, subsurface drip irrigation, sand mound, and sprinkler systems, by statistical techniques. Compliance was also evaluated for groundwater samples collected from monitoring wells installed at four corners of a disposal field. This work eventually …
The Importance Of Soft Skills In The Workplace As Perceived By Community College Instructors And Industries, Laura Suzanne Tribble
The Importance Of Soft Skills In The Workplace As Perceived By Community College Instructors And Industries, Laura Suzanne Tribble
Theses and Dissertations
Soft skills include communication skills, problem-solving skills, conflict resolution, working well with other people, and ensuring customer satisfaction. Employers need employees who have adequate technical skills but who also have soft skills. There is limited information about the perceptions of which soft skills are needed in the workplace. This study attempted to close the gap in the literature concerning the perceptions of instructors and employers in the area of soft skills in the workplace. For this study, the Soft Skills Survey for Instructors and Employers was used to gather the perceptions of information technology instructors and employers in five community …
Current Sharing To Minimize Power Losses In Parallel Converters Using Pso, Dan Li
Current Sharing To Minimize Power Losses In Parallel Converters Using Pso, Dan Li
Theses and Dissertations
The Power Electronic Building Block (PEBB) concept leads to multifunctional converter systems, which provide robustness and flexibility in heavily power electronics based power systems. Systems comprised of flexible modular converters may have multiple possible operation conditions with respect to individual converters that meet the overall system goals. In this thesis, an optimization method for such flexible online power electronic systems is developed to minimize power losses of the overall group of converters in the system. Here the objective is to allocate sharing such that compensation objectives are met while the power loss of the entire parallel group of compensators is …
Assessing Job Satisfaction Among Alabama's Community College Faculty, Russell Warren Howton
Assessing Job Satisfaction Among Alabama's Community College Faculty, Russell Warren Howton
Theses and Dissertations
The purpose of the study was to examine the relationship between selected demographic and educational variables of faculty members employed in the Alabama Community College System and their impact on job satisfaction. The variables included in the study are the demographic variables of age, gender, ethnicity, salary, and degree status, along with the institutional variables of academic ability of students, advancement in technology, faculty workload, tenure, co-worker relationship, administrative governance and support, and professional growth opportunities. This study was conducted to educate college administrators regarding faculty morale and to provide a means of communication between administrators and faculty to address …
Mobile Computing And Sensor Web Services For Coastal Buoys, Santhosh Kumar Amanchi Rajender
Mobile Computing And Sensor Web Services For Coastal Buoys, Santhosh Kumar Amanchi Rajender
Theses and Dissertations
Mobile device technology with the influence of the Internet is creating a lot of Webbased services so that people can have easy and 24-hour access to the services. Recently, the Google’s Android has revolutionized applications development for the mobile platform. As there is an increasing number of companies exposing their services as Web services, enabling flexible mobile access to distributed Web resources is a relevant challenge. However, the current Web is a collection of human readable pages that are unintelligible to computer programs. Semantic Web and Web services have the potential of overcoming this limitation. For this, a standard ontology …
Movements, Relatedness And Modeled Genetic Manipulation Of White-Tailed Deer, Stephen Lance Webb
Movements, Relatedness And Modeled Genetic Manipulation Of White-Tailed Deer, Stephen Lance Webb
Theses and Dissertations
White-tailed deer (Odocoileus virginianus) have been intensively studied across their range. However, many aspects of the white-tailed deer’s ecology have not been studied or are difficult to study. The advent of global positioning system (GPS) collar technology and molecular genetics techniques now allows researchers to collect fine-scale and cryptic phenomena. In addition, selective harvest of male white-tailed deer, based on antler size, has not been critically evaluated. Thus, development and use of quantitative genetics models will be useful for elucidating the effects of selective harvest on mean population antler size. I used GPS collar technology to further understand white-tailed deer …
Obstacle Array Drag Coefficient Parametric Response Surface Analysis, Mouthgalya Ganapathy
Obstacle Array Drag Coefficient Parametric Response Surface Analysis, Mouthgalya Ganapathy
Theses and Dissertations
Throughout literature, one finds where numerous methodologies and models have been developed to predict the effect of surface roughness on a flat surface. Many of the models utilize a drag coefficient as one of the necessary parameters. In urban settings with groups of buildings, the drag coefficient on an individual obstacle would be determined by parameters like wind direction and the relative positioning of a building, in addition to Reynolds number and shape. Computational experiments were performed to simulate the fluid flow around a single row and two rows of “cube” obstacles. Based on dimensional analysis, the drag coefficient was …
Optimal Control Of Voltage And Power In Mvdc Multi-Zonal Shipboard Power System, Padmavathy Kankanala
Optimal Control Of Voltage And Power In Mvdc Multi-Zonal Shipboard Power System, Padmavathy Kankanala
Theses and Dissertations
Recent advancements in Voltage Source Converters (VSCs) of high-voltage and high-power rating had a significant impact on the development of Multi-Terminal HVDC (MTDC) power transmission systems. The U.S. Navy has proposed Multi-Zonal Medium Voltage DC (MVDC) Shipboard Power System (SPS) architecture for the next generation of their surface combatant. A Multi-Zonal MVDC SPS consists of several VSCs exchanging power through a DC network. Following a system fault or damage, the current flow pattern in the DC distribution grid will change and the DC voltages across the VSCs will assume new values. DC voltage reference or power reference settings of VSCs …
Parallel Viterbi Search For Continuous Speech Recognition On A Multi-Core Architecture, Naveen Parihar
Parallel Viterbi Search For Continuous Speech Recognition On A Multi-Core Architecture, Naveen Parihar
Theses and Dissertations
State-of-the-art speech-recognition systems can successfully perform simple tasks in real-time on most computers, when the tasks are performed in controlled and noiseree environments. However, current algorithms and processors are not yet powerful enough for real-time large-vocabulary conversational speech recognition in noisy, real-world environments. Parallel processing can improve the real-time performance of speech recognition systems and increase their applicability, and developing an effective approach to parallelization is especially important given the recent trend toward multi-core processor design. In this dissertation, we introduce methods for parallelizing a single-pass across-word n-gram lexical-tree based Viterbi recognizer, which is the most popular architecture for Viterbi-based …
Flathead Catfish Stock Characteristics In The Pascagoula River Following Hurricane Katrina, Russell M. Barabe
Flathead Catfish Stock Characteristics In The Pascagoula River Following Hurricane Katrina, Russell M. Barabe
Theses and Dissertations
Flathead catfish stocks in the Pascagoula River were decimated by the passage of Hurricane Katrina. Age-0 fish survived the storm, producing a strong 2005 year-class. Reproduction by the remaining adults and/or downstream movement from tributaries produced an additional strong cohort in 2006. The strong 2005 year-class resulted in the capture of a high proportion of two-year-old fish in 2007. In 2008, a high proportion of two- and three-year-old fish were captured, illustrating the high rate of survival of the 2005 year-class, and the presence of a strong 2006 year-class. The flathead catfish population of the Pascagoula River was dominated by …
An Examination Of Crisis Preparedness At Christian-Affiliated Institutions Of Higher Education, Stacy M. Burrell
An Examination Of Crisis Preparedness At Christian-Affiliated Institutions Of Higher Education, Stacy M. Burrell
Theses and Dissertations
The purpose of this study was to examine crisis preparedness at Christian-affiliated institutions of higher education. Second, this study examined Christian-affiliated institutions of higher education presidents’ perspective of their institution’s ability to prepare for crises based upon the four critical indicators of organizational crisis preparedness as described by Zdziarski (2001): a) the types of crisis institutions prepare for, b) the phase of crisis prepared for, c) the systems in place to respond to crisis, and d) the stakeholders involved and considered in preparations. Implications from this study provided recommendations for crisis preparedness that are specific to Christian-affiliated colleges and universities. …
Detection Of Tick-Borne Bacterial Agents In Lone Star Ticks (Amblyomma Americanum) And Various Wildlife In Mississippi, Ashley Harris Castellaw
Detection Of Tick-Borne Bacterial Agents In Lone Star Ticks (Amblyomma Americanum) And Various Wildlife In Mississippi, Ashley Harris Castellaw
Theses and Dissertations
Two studies were conducted to evaluate the presence of tick-borne bacterial agents in Amblyomma americanum, lone star tick (LST), and various wildlife in Mississippi. Adult LSTs had DNA evidence of Ehrlichia chaffeensis (3.7%), E. ewingii (6.3%), and Borrelia lonestari (2.6%), while both larval (24.3%) and adult (43.5%) LSTs were positive for a Rickettsia spp. by polymerase chain reaction (PCR). White-tailed deer (WTD) were the only wildlife PCR positive for E. chaffeensis (18.8%), B. lonestari (3.1%), and Anaplasma phagocytophilum (3.1%). In addition, WTD had the highest seroprevalence to B. lonestari (19.3%) and E. chaffeensis (43.9%) antigens while raccoons had the highest …
Fusion Of Spectral Reflectance And Derivative Information For Robust Hyperspectral Land Cover Classification, Hemanth Reddy Kalluri
Fusion Of Spectral Reflectance And Derivative Information For Robust Hyperspectral Land Cover Classification, Hemanth Reddy Kalluri
Theses and Dissertations
Developments in sensor technology have made high resolution hyperspectral remote sensing data available to the remote sensing analyst for ground cover classification and target recognition tasks. Further, with limited ground-truth data in many real-life operating scenarios, such hyperspectral classification systems often employ dimensionality reduction algorithms. In this thesis, the efficacy of spectral derivative features for hyperspectral analysis is studied. These studies are conducted within the context of both single and multiple classifier systems. Finally, a modification of existing classification techniques is proposed and tested on spectral reflectance and derivative features that adapts the classification systems to the characteristics of the …