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Real Time Test Bed Development For Power System Operation, Control And Cybersecurity, Ram Mohan Reddi
Real Time Test Bed Development For Power System Operation, Control And Cybersecurity, Ram Mohan Reddi
Theses and Dissertations
The operation and control of the power system in an efficient way is important in order to keep the system secure, reliable and economical. With advancements in smart grid, several new algorithms have been developed for improved operation and control. These algorithms need to be extensively tested and validated in real time before applying to the real electric power grid. This work focuses on the development of a real time test bed for testing and validating power system control algorithms, hardware devices and cyber security vulnerability. The test bed developed utilizes several hardware components including relays, phasor measurement units, phasor …
Modeling Moisture Absorption And Thickness Swelling For Oriented Strand Board (Osb), Robert Aaron Slay
Modeling Moisture Absorption And Thickness Swelling For Oriented Strand Board (Osb), Robert Aaron Slay
Theses and Dissertations
The dimensional stability of oriented strand board (OSB) can be affected by processing variables. This study investigated the water absorption and thickness swelling of OSB based on its board layup, type of resin, resin content, and percentage of wax. The experiment data was measured inside an environmental chamber from oven dry (OD) conditions to 80% relative humidity (RH), and from OD to 90% RH. The results suggest that single layer boards and isocyanate resin provide greater dimensional stability to OSB than three layer boards or phenol formaldehyde resin. In addition, the water absorption and thickness swell data were effectively modeled …
Understanding Of Digital Copyright Issues Among Business Career And Technical Educators In Mississippi, Jean Alice Walke Mcdavid
Understanding Of Digital Copyright Issues Among Business Career And Technical Educators In Mississippi, Jean Alice Walke Mcdavid
Theses and Dissertations
This study investigated the understanding of digital copyright issues among business career and technical educators in Mississippi. The areas considered were knowledge; perceptions of knowledge; areas of copyright knowledge including computers and software, the Internet, video, and multimedia; and demographics of teaching level, gender, participation in professional development activities, and teaching experience. Participants included 75 Mississippi business career and technical educators at both the secondary and postsecondary levels. The knowledge level of participants was judged to be low; only four participants reached the established competency level of 70%. Their self-rated perception level was higher than their knowledge level, with the …
Utilization Of Extracted Hardwood Flakes For Manufacturing Oriented Strand Lumber, Thomas Eric Mcconnell
Utilization Of Extracted Hardwood Flakes For Manufacturing Oriented Strand Lumber, Thomas Eric Mcconnell
Theses and Dissertations
Lignocellulosic ethanol production currently uses expensive and harsh methods to extract wood sugars from small-diameter hardwood trees that otherwise would have little or no marketability. A byproduct that adds no value to the conversion process results, thus alternative methods are needed to make this fuel source cost-effective. This dissertation proposes only partially hydrolyzing southern hardwoods, extracting some polysaccharides for ethanol fermentation while leaving behind a modified wood material which could be used as furnish for manufacturing strand-based wood composites. Three treating solutions, 1% sulfuric acid, water, and 1% sodium hydroxide, along with untreated controls, were utilized in a partial hydrolysis …
Vortices In The Near Field Of Optical Dipole Radiation, Xin Li
Vortices In The Near Field Of Optical Dipole Radiation, Xin Li
Theses and Dissertations
An oscillating electric dipole emits radiation, and the flow of energy is represented by the field lines of the Poynting vector. In the most general state of oscillation the dipole moment vector traces out an ellipse. We have evaluated analytically and numerically the field lines of the Poynting vector for the emitted light, and it appears that each field line lies on a cone, which has its axis perpendicular to the plane of the ellipse. The field lines exhibit a vortex structure near the location of the dipole, and they approach a straight line in the far field. The spatial …
Waterhammer Modeling For The Ares I Upper Stage Reaction Control System Cold Flow Development Test Article, Jonathan Hunter Williams
Waterhammer Modeling For The Ares I Upper Stage Reaction Control System Cold Flow Development Test Article, Jonathan Hunter Williams
Theses and Dissertations
The Upper Stage Reaction Control System provides inlight three-axis attitude control for the Ares I Upper Stage. The system design must accommodate rapid thruster firing to maintain proper launch trajectory and thus allow for the possibility to pulse multiple thrusters simultaneously. Rapid thruster valve closure creates an increase in static pressure, known as waterhammer, which propagates throughout the propellant system at pressures exceeding nominal design values. A series of development tests conducted at Marshall Space Flight Center in 2009 were performed using a waterlow test article to better understand fluid characteristics of the Upper Stage Reaction Control System. A subset …
Helping Prepare Community College Students To Make The Transition From College To Work, Lagena Arlette Bradley
Helping Prepare Community College Students To Make The Transition From College To Work, Lagena Arlette Bradley
Theses and Dissertations
The purpose of the study was to investigate students’ perceptions about the need for more student training on making the transition from community college enrollment to employment. The hypothesis was that community college students would perceive that additional career counseling services would help them transition successfully into the world of work. Examination of students’ thoughts about career counseling services assisted in finding factors that facilitate and impede students’ desires for career counseling services including career courses. A researcher-developed pen and paper self-report survey instrument was administered to students enrolled in English courses at Meridian Community College during the 2009 fall …
Influence Of Soil Properties On The Aboveground Blast Environment From A Near-Surface Detonation, John Q. Ehrgott
Influence Of Soil Properties On The Aboveground Blast Environment From A Near-Surface Detonation, John Q. Ehrgott
Theses and Dissertations
Detonation of an explosive charge, such as a mine or an improvised explosive device (IED) at the ground surface or buried at shallow depth in soil, can produce high airblast pressures and significant dynamic soil debris loads on an overlying or nearby structure, such as a vehicle passing over the explosive. The blast loading environment is a function of many factors including the explosive type, configuration, mass, and depth of burial, soil characteristics, and the distance between the ground surface and the structure or object. During the past several years, the US Army has focused considerable attention on developing improved …
Influences Of Artificial Reefs On Juvenile Red Snapper Along The Mississippi Gulf Coast, Jason Robert Brandt
Influences Of Artificial Reefs On Juvenile Red Snapper Along The Mississippi Gulf Coast, Jason Robert Brandt
Theses and Dissertations
Artificial reefs are important management tools for red snapper, Lutjanus campechanus, fisheries in the Northern Gulf of Mexico. I deployed fish traps (0.97 m long; 0.64 m height; 175 x 115 mm funnel mouth size) to collect red snapper < 406 mm total length (TL) associated with pyramid-shaped artificial reef structures (3.7 m triangular base; 2.4 m height; 3.2 metric tons) to evaluate two reef distribution designs: (1) five closely-spaced pyramid units, and (2) five closely-spaced pyramids with two sets of two pyramids at 30.5, 61.0, and 91.5 m from the five pyramids. In 26 sampling trips, 927 red snapper were captured. Catch per unit effort (fish/hour) did not differ significantly among patterns (P= 0.396). Red snapper lengths differed significantly among patterns (P= 0.005), with the largest mean total length (235 mm, SE= 5.14) occurring at the pattern with 61.0-m spacing.
Physical And Mechanical Properties Evaluations Of A New Engineered Wood Product, Jonathan Michael Linton
Physical And Mechanical Properties Evaluations Of A New Engineered Wood Product, Jonathan Michael Linton
Theses and Dissertations
Finding alternative uses for small diameter raw materials is a critical problem throughout the United States. Insufficient markets for small diameter, southern yellow pine (Pinus spp.) trees from first plantation thinnings are impacting silvicultural practices on millions of acres of land. In western states, the lack of markets for small diameter ponderosa pine (Pinus ponderosa) and lodgepole pine (Pinus contorta) creates multiple problems in terms of excess material in the forest. This excess material enhances fire potential and reduces land management practices. This research deals with a new structural composite from small diameter raw logs using a technology called steampressed …
Political Ideology And Ideological (Re)Alignment 1972-2006, Derrick Ryan Shapley
Political Ideology And Ideological (Re)Alignment 1972-2006, Derrick Ryan Shapley
Theses and Dissertations
This study tests the relationship of the 6 ideological variables and 7 contextual variables to shifts in ideological alignment through a latent class regression analysis for three periods of years (1972-1978, 1980-1992, 1993-2006). The latent class regression models determine the number of identifiable classes for each model. Using ideological realignment theory (Abramowitz and Saunders 1998) this study finds there has been a moderate polarization of opinions that has occurred, as well as, a moderate hardening of ideological beliefs with moral issues during the third time period becoming the driving force in ideological makeup. With regard to the culture wars hypothesis …
Spatio-Temporal Characteristics Of Mississippi Wildfires, Saranee Dutta
Spatio-Temporal Characteristics Of Mississippi Wildfires, Saranee Dutta
Theses and Dissertations
Based on wildfire data acquired from Mississippi forestry commission from 1991- 2005 approximately 4,000 wildfires occur in Mississippi each year, burning over 60,000 acres of forest and grassland. This study focuses on Mississippi’s wildfires from 1991- 2005 for the summer/fall period defined for this study as the May-November fire season. Statistical analysis indicates that there is significant correlation between vegetation indices derived from remotely sensed data and wildfire size at various time lag periods. Forest areas are correlated with vegetation indices at longer lag periods, nonorested areas are correlated at shorter lag periods. The inverse correlation between wildfire size and …
The Conditioning Effects Of Religiosity On The Relationship Between Strain, Negative Emotions, And Delinquency: A Longitudinal Assessment Of General Strain Theory, Christopher W. Purser
The Conditioning Effects Of Religiosity On The Relationship Between Strain, Negative Emotions, And Delinquency: A Longitudinal Assessment Of General Strain Theory, Christopher W. Purser
Theses and Dissertations
Robert Agnew’s (1992) General Strain Theory significantly revitalized traditional scholarship in the anomie/strain tradition by offering a general theory of crime; purported to account for both criminal and analogous behaviors. GST specifically extends anomie/strain theory by introducing new sources of strain (i.e. loss of positively valued stimuli, presentation of noxious stimuli) into the theoretical framework, as well as elucidating the causal pathways (including mediating and moderating effects) leading from the experience of strain to deviant coping mechanisms. An emerging trend within GST is the identification of previously untapped sources of strain (e.g. victimization, discrimination) that ostensibly have deviancegenerating properties. Concerning …
The Economic Feasibility Of Producing Sweet Sorghum As An Ethanol Feedstock In Mississippi, Joseph Andrew Linton
The Economic Feasibility Of Producing Sweet Sorghum As An Ethanol Feedstock In Mississippi, Joseph Andrew Linton
Theses and Dissertations
This study examines the feasibility of producing sweet sorghum as an ethanol feedstock in Mississippi. An enterprise budgeting system is used along with estimates of transportation costs to estimate farmers’ breakeven costs for producing and delivering sweet sorghum biomass. This breakeven cost for the farmer, along with breakeven costs for the producer based on wholesale ethanol price, production costs, and transportation and marketing costs for the refined ethanol, is used to estimate the amounts that farmers and ethanol producers would be willing to accept (WTA) and willing to pay (WTP), respectively, for sweet sorghum biomass. These WTA and WTP estimates …
The Effects Of Four Pre-Emergent Herbicides On The Rooting Architecture Of Hybrid Bermudagrass, Christopher Jerome Nettles Jr.
The Effects Of Four Pre-Emergent Herbicides On The Rooting Architecture Of Hybrid Bermudagrass, Christopher Jerome Nettles Jr.
Theses and Dissertations
Weed control is essential in managing high quality turfgrasses. Some preemergent (PRE) herbicides may pose a negative effect on rooting architecture (total length, surface area, diameter, and mass) of desirable species. Several PRE herbicides work by negatively affecting normal cell division and development. Evaluations were performed to determine the effects of four PRE herbicides (dithiopyr, oxadiazon, pendimethalin, and quinclorac) on hybrid bermudagrass (Cynodon dactylon L. X C. transvaalensis Burtt-Davy) (BG) root architecture. Herbicide treatments were applied to field grown dormant BG in Mid-March of 2008 and 2009. A decrease in root length, and in surface area, was observed at 8 …
Investigations Of Factors Affecting Pine And Cottonwood Pyrolysis Oil Aging, Caitlin Durnin Naske
Investigations Of Factors Affecting Pine And Cottonwood Pyrolysis Oil Aging, Caitlin Durnin Naske
Theses and Dissertations
Studies of aging processes were conducted on pyrolysis oils produced from pine and cottonwood biomass (clear wood, whole tree, bark and needles/leaves). Accelerated aging at 80 °C for up to 504 h was employed to investigate the short and long-term effects of feedstock, phase separation, char particulates, and solvent addition on pyrolysis oil properties. Feedstock containing forestry residue was found to increase water content of neat pyrolysis oil and the collection method (total vs. fractionated) affects all of the properties with the largest impact on viscosity and as produced molecular weight. Post-condensation liquid filtration did not prevent aging-related water content …
Effect Of Cooking And Packaging Methods On Consumer Acceptability And Shelf-Life Of Ready-To-Eat Gulf Brown Shrimp, Vimal Vinodchandra Kamadia
Effect Of Cooking And Packaging Methods On Consumer Acceptability And Shelf-Life Of Ready-To-Eat Gulf Brown Shrimp, Vimal Vinodchandra Kamadia
Theses and Dissertations
Shrimp is the most valued shellfish product in the United States, and is highly perishable with post mortem metabolic changes that are deteriorative to its shelf-life. The objective of this research was to utilize GC-MS Gas Chromatography-Mass Spectrometry (GC-MS), Gas Chromatography Olfactometry (GCO), and sensory analysis to determine if the relationships exist between consumer acceptability, sensory descriptors and shelf-life of ready-to-eat shrimp. Three different cooking and packaging treatments were utilized: 63°C/15 s, 85°C/5 min, and 93°C/5 min for vacuum, MAP and aerobic packaging treatments, and stored at 2°±1 for 1, 3, 5, 6, 10, 15, 25, and 50 days or …
Effects Of Prescribed Fire And Selective Herbicide (Imazapyr) On Biodiversity In Intensively Managed Pine Stands Of Mississippi, Raymond Bruce Iglay
Effects Of Prescribed Fire And Selective Herbicide (Imazapyr) On Biodiversity In Intensively Managed Pine Stands Of Mississippi, Raymond Bruce Iglay
Theses and Dissertations
Prescribed fire and imazapyr are two silviculture tools used to control hardwood midstory competition in intensively managed, mid-rotation pine (Pinus spp.) stands but also may support conservation of biodiversity in the southeastern United States. Therefore, I investigated select measures of biodiversity response, small mammals, reptiles, amphibians, carabid beetles, songbirds, and vegetation communities, to fire and imazapyr treatments in intensively managed, mid-rotation pine stands of east-central Mississippi. I used a randomized complete block design of 6 stands (blocks) with 4, 10- ha treatment plots assigned randomly a treatment of burn only, herbicide only, burn + herbicide, or control. I applied dormant …
Evolution Of The Protein-Coding Genes In The Genomes Of The Mycoplasmatales, Dipaloke Mukherjee
Evolution Of The Protein-Coding Genes In The Genomes Of The Mycoplasmatales, Dipaloke Mukherjee
Theses and Dissertations
The bacterial species belonging to the order Mycoplasmatales have highly truncated genomes, and are thus ideal for studying genome evolution patterns. Fourteen members (twelve species) of this order were selected for study of genome evolution based on gene function and phylogeny. A database was constructed that consisting of the set of genes that are common to all of these species, and these genes were further subdivided based on their functions. A Bayesian phylogenetic tree was also constructed from the 16 S ribosomal DNA sequences from these species and robust clades were identified for testing the influence of selection on gene …
Organizational, Job, And Supervisory Antecedents And Consequence Of Job Embeddedness: The Case Of Vietnam, Vinh Q. Nguyen
Organizational, Job, And Supervisory Antecedents And Consequence Of Job Embeddedness: The Case Of Vietnam, Vinh Q. Nguyen
Theses and Dissertations
A recent major development in the turnover literature is the introduction of the Job Embeddedness (JE) construct. JE is a multidimensional construct conceptualized as the combined forces that tend to keep an employee from leaving his or her job. Research has demonstrated that JE predicts voluntary turnover above and beyond the variables used in traditional turnover models. However, since it is a relatively new construct, JE has received very limited study, especially across cultures. Further research is needed in order to understand both antecedents and consequences of JE. This dissertation, therefore, investigates a range of presumed organizational, job, and supervisory …
Fiber Loop Ringdown Evanescent Field Sensors, Chamini Saumya Herath
Fiber Loop Ringdown Evanescent Field Sensors, Chamini Saumya Herath
Theses and Dissertations
We combine the evanescent field (EF) sensing mechanism with the fiber loop ringdown (FLRD) sensing scheme to create FLRD-EF sensors. The EF sensor heads are fabricated by etching the cladding of a single-mode fiber (SMF), while monitoring the etching process by the FLRD technique in real-time, on-line with high control precision. The effect of the sensor head dimensions on the sensors' detection sensitivity and response time are investigated. The EF scattering (EFS) sensing mechanism is combined with the FLRD detection scheme to create a new type of fiber optic index sensor. The detection limit for an optical index change is …
Full-Scale Evaluation Of Matting Systems For Temporary Roads, Timothy Wallace Rushing
Full-Scale Evaluation Of Matting Systems For Temporary Roads, Timothy Wallace Rushing
Theses and Dissertations
An evaluation of eleven roadway matting systems was conducted to determine their effectiveness in carrying heavy vehicle traffic over loose sand subgrades. Three of the eleven matting systems were also evaluated over soft fine-grained subgrades. Matting products included high-density polyethylene, aluminum, fiberglass, and polyester. System configurations included continuous rolls of material, segmented rolls, and individual panels. The matting products were assembled on test sections and trafficked with a 7-ton, 6-wheeled truck loaded with a 7-ton payload until 20 percent of the mat section was no longer reusable or 2,000 truck passes were achieved. Earth pressure cells were installed under nine …
The Impact Of Accelerated Reader (Ar) Program On Students' Mct Reading Scores, Kenyartic Lewon Brown
The Impact Of Accelerated Reader (Ar) Program On Students' Mct Reading Scores, Kenyartic Lewon Brown
Theses and Dissertations
This study was needed to determine if the Accelerated Reader (AR) program made a positive impact in schools, which were attempting to increase student achievement in reading. The purpose of this study was to determine if students who received reading instruction supplemented with the AR Program achieved higher reading scores as measured by the Mississippi Curriculum Test (MCT) than students who were instructed using only traditional basal reader textbooks. 6 school districts were selected to participate in this study. There were 1,111 3rd — 5th grade students in the 6 districts between the years 2004 and 2007. Of those 1,111 …
The Stirling Engine: Thermodynamics And Applications In Combined Cooling, Heating, And Power Systems, James Clayton Harrod
The Stirling Engine: Thermodynamics And Applications In Combined Cooling, Heating, And Power Systems, James Clayton Harrod
Theses and Dissertations
The goal of this study is to assess the potential of the Stirling engine in alternative energy applications including combined cooling, heating, and power (CCHP) and novel waste heat recovery (WHR) technologies. A first and second law model is developed to quantify Stirling engine performance and realize the crucial parameters in Stirling engine design. In addition, analysis of systems employing the Stirling engine as a prime mover can help justify particular design interests for the engine regarding certain applications. A model of a CCHP system is developed with a Stirling engine prime mover. Sensitivity analysis is performed on the CCHP …
Gasoline-Range Hydrocarbons Produced From Three Types Of Synthesis Gas Using A Mo/Hzsm-5 Catalyst, Jason Tyler Street
Gasoline-Range Hydrocarbons Produced From Three Types Of Synthesis Gas Using A Mo/Hzsm-5 Catalyst, Jason Tyler Street
Theses and Dissertations
Biomass-derived hydrocarbons that include gasoline, diesel, and jet fuel will help replace finite fossil fuel hydrocarbons of the same range. This study showed that temperature could be controlled in a scaled-up reactor system using three types of syngas. The CO conversion, selectivity and amount of product created from each type of syngas were examined. Clean syngas composed of 40% H2, 20% CO, 12% CO2, 2% CH4, and 26 % N2 was used to test ideal stoichiometric molar values. Clean syngas composed of 19% H2, 20% CO, 12% CO2, 2% CH4, and 47 % N2 was used to test an ideal …
Effects Of Repeated Prescribed Fires On Upland Oak Forest Ecosystem In The Missouri Ozarks, Zhongqiu Ma
Effects Of Repeated Prescribed Fires On Upland Oak Forest Ecosystem In The Missouri Ozarks, Zhongqiu Ma
Theses and Dissertations
In this research, the fire effects on structural and compositional change, and advance regeneration of oak forests in the Ozarks of Missouri were investigated by combining the statistic methods of MANONA, survival analysis, CART analysis, and logistic analysis. Results indicated that fire treatments significantly reduced the midsotry and understory basal area and stem density. However, fire effects on overstory tree survival differentiated among size classes. A new morphological variable, ratio of the total height to the square of basal diameter, was found to be statistically significantly related to the tree mortality rate for most of the species. The developed logistic …
A Meta-Analysis Of School-Based Childhood Obesity Prevention Programs, Ling Shen Hung
A Meta-Analysis Of School-Based Childhood Obesity Prevention Programs, Ling Shen Hung
Theses and Dissertations
The prevalence rate of childhood obesity has increased rapidly worldwide. The childhood obesity epidemic is associated with many adverse health consequences in children as well as a financial burden for a nation’s economy. A meta-analysis was conducted to investigate the effectiveness of school-based childhood obesity prevention programs in preventing childhood obesity. The objectives of this study were to 1) identify the most effective childhood obesity prevention programs through effect size comparison, and 2) identify important program components that affect the effectiveness of the intervention through subgroup analysis. The Comprehensive Meta-Analysis (CMA) program was used for all statistical analyses. Results of …
Identification Of Measurement Technology For Online Recording Of Transients In Underground Residential Distribution System, Balaji Pushpanathan
Identification Of Measurement Technology For Online Recording Of Transients In Underground Residential Distribution System, Balaji Pushpanathan
Theses and Dissertations
Underground Residential Distribution (URD) power cables are aged due to electrical, thermal, mechanical, and environmental stresses during their service. The recent dielectric conditions of the cables are of much interest for utilities. The existing offline diagnostic method requires forceful disconnection of the URD cable for maintenance. Online recording and Fast Fourier Transform analysis of intentionally created transients in URD is one of the promising method to assess the current condition of the cable. For the bigger goal of developing an online power cable condition assessment, the measurement techniques which are required to be implemented has to be evaluated. In order …
Shear Stress Analysis Of Levees Subjected To Combined Surge And Wave Overtopping, Justin Michael Shaw
Shear Stress Analysis Of Levees Subjected To Combined Surge And Wave Overtopping, Justin Michael Shaw
Theses and Dissertations
Storm surge above the levee crest elevation combined with levee wave overtopping can place large shear stresses on the levee landward slope face. Previous research has examined overtopping flow conditions, but the resulting shear stress has not been thoroughly analyzed. The purpose of this thesis is to examine multiple combinations of overtopping flow conditions and the resultant shear stress along the levee’s landward slope. This thesis presents measurements of depth, velocity, discharge, and wave height, and it estimates shear stress using data collected from a scaled physical model. Shear stress is estimated using three equations including a version of Saint-Venant …
Software Maintainability Measurement: A Task Complexity Perspective, Lulu He
Software Maintainability Measurement: A Task Complexity Perspective, Lulu He
Theses and Dissertations
Software maintainability is one of the most crucial quality attributes of a software product. Software engineering researchers and practitioners have devoted considerable effort to developing “good design” methods, rules and principles to improve software maintainability. But before we can validate the effectiveness of these methods, we first need an approach to measure software maintainability. The existing maintainability measures usually have limited scope and accuracy since they either isolate the software from its environment and focus only on the technical properties of the software, or measure a confounding effect of various factors involved in the maintenance process. Furthermore, these measures are …