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Articles 2491 - 2520 of 135666
Full-Text Articles in Entire DC Network
Electrical Breakdown Strength Of 5 Kv Ethylene Propylene Rubber (Epr) Cable Under Ac Voltage, Bishal Pradhan
Electrical Breakdown Strength Of 5 Kv Ethylene Propylene Rubber (Epr) Cable Under Ac Voltage, Bishal Pradhan
Theses and Dissertations
Ethylene propylene rubber (EPR) cable has been extensively used for distribution of power. The insulation of cable should withstand electrical, thermal, mechanical, and chemical stresses during its operation. It is imperative to measure the data providing dielectric strength of EPR cable for these stresses. Significant improvements on the quality of insulation have been progressing for better performance of cable under these stresses. This study deals with ac voltage stress imposed on the cable. The electrical breakdown strength of 5kV EPR cable under ac voltage has been measured by constructing a suitable test set in Mississippi State University High Voltage Lab.
Aspects Of The Ecology And Management Of Mottled Ducks In Coastal South Carolina, James Claybourne Shipes
Aspects Of The Ecology And Management Of Mottled Ducks In Coastal South Carolina, James Claybourne Shipes
Theses and Dissertations
Mottled ducks (Anas fulvigula) are endemic to Gulf Coastal United States and Mexico. Birds from Florida, Louisiana, and Texas were released in coastal South Carolina from 1975-1983, and banding data suggest an expanding South Carolina population. We radio-marked 116 females in August 2010-2011 in the Ashepoo, Combahee, and Edisto (ACE) Rivers Basin and used radio telemetry to study habitat selection, searched for nests of non-radiomarked females, and conducted indicated breeding pair surveys of mottled ducks at various wetlands. Overall, radiomarked mottled duck females selected managed wetland impoundments, wetlands containing planted corn, and brackish wetlands. Overall nest success of 42 nests …
Assessing Code Decay By Detecting Software Architecture Violations, Ajay Bandi
Assessing Code Decay By Detecting Software Architecture Violations, Ajay Bandi
Theses and Dissertations
Code decay is a gradual process that negatively impacts the quality of a software system. Developers need trusted measurement techniques to evaluate whether their systems have decayed. This dissertation aims to assess code decay by discovering software architectural violations. Our methodology uses Lightweight Sanity Check for Implemented Architectures to derive architectural constraints represented by can-use and cannot-use phrases. Our methodology also uses Lattix to discover architectural violations. We also introduce measures that indicate code decay in a software system. We conducted two case studies of proprietary systems (9 versions of System A and 14 versions of System B) to demonstrate …
Development And Optimization Of A Rapid Assay Kit For The Detection Of Vibrio Cholerae In Bivalves, Demarcus Rashad Carter
Development And Optimization Of A Rapid Assay Kit For The Detection Of Vibrio Cholerae In Bivalves, Demarcus Rashad Carter
Theses and Dissertations
A rapid assay kit for Vibrio cholerae (Vc) was developed to detect and quantify Vc cells in oyster samples within 24 h. The kit, formulated within a two -phase (liquid and solid) 96-well plate, can detect biomarker expression of Vc when the enrichment broth and incubation temperature are optimized. The kit showed 91 % selectivity and 92 % specificity when tested with 23 inclusive Vc and 106 exclusive non-Vc strains. The kit was further optimized using 47 samples of oysters, clams, and soil. There was no significant difference in most probable number between the kit, conventional PCR and BAX PCR …
A Synthetic Approach To The Biflavonoids Chamaejasmine And Isochamaejasmine, Verna B. Baron
A Synthetic Approach To The Biflavonoids Chamaejasmine And Isochamaejasmine, Verna B. Baron
Theses and Dissertations
Biflavonoids form a ubiquitous class of compounds in nature, which are well known for their numerous medicinal benefits. Biflavonoids such as chamaejasmine and isochamaejasmine have been shown to exhibit pharmacological activity such as anitidiabetic, anti-malaria, anti- HIV, anticancer etc. Biflavanones, chamaejasmine and isochamaejasmine are dimers of the flavanone narigenin at the C-3 position, which gives them a rare 3/3" C - C linkage. They are structurally similar in that they both have four stereocenters. The difference between these two compounds is the stereochemistry at the C-2" and C-3". In this study, installation of each of these stereocenters will be targeted …
Characterization Of Maize Genes In Response To Aspergillus Flavus Infection And Aflatoxin Accumulation, Matthew Constantine Asters
Characterization Of Maize Genes In Response To Aspergillus Flavus Infection And Aflatoxin Accumulation, Matthew Constantine Asters
Theses and Dissertations
Aspergillus flavus is a pathogenic fungus causing maize ear rot disease and producing aflatoxins that are carcinogenic to humans and animals. Characterizing maize host resistance mechanisms and prioritizing candidate resistance genes are important to the development of resistant maize germplasm. This study investigated transcriptomics approaches and statistics methods on the identification of maize host resistance genes. Full-length cDNA libraries were also constructed and evaluated for gene cloning and functional analysis. This study established important sources for functional studies on differentially expressed genes and for identification of allelic gene forms to characterize gene polymorphisms and facilitate the development of DNA markers.
Computational Methods For Solving Next Generation Sequencing Challenges, Tamer Ali Aldwairi
Computational Methods For Solving Next Generation Sequencing Challenges, Tamer Ali Aldwairi
Theses and Dissertations
In this study we build solutions to three common challenges in the fields of bioinformatics through utilizing statistical methods and developing computational approaches. First, we address a common problem in genome wide association studies, which is linking genotype features within organisms of the same species to their phenotype characteristics. We specifically studied FHA domain genes in Arabidopsis thaliana distributed within Eurasian regions by clustering those plants that share similar genotype characteristics and comparing that to the regions from which they were taken. Second, we also developed a tool for calculating transposable element density within different regions of a genome. The …
Computational Methods On Study Of Differentially Expressed Proteins In Maize Proteomes Associated With Resistance To Aflatoxin Accumulation, Alka Tiwari
Theses and Dissertations
Plant breeders have focused on improving maize resistance to Aspergillus flavus infection and aflatoxin accumulation by breeding with genotypes having the desirable traits. Various maize inbred lines have been developed for the breeding of resistance. Identification of differentially expressed proteins among such maize inbred lines will facilitate the development of gene markers and expedite the breeding process. Computational biology and proteomics approaches on the investigation of differentially expressed proteins were explored in this research. The major research objectives included 1) application of computational methods in homology and comparative modeling to study 3D protein structures and identify single nucleotide polymorphisms (SNPs) …
Effects Of Resveratrol On Post-Thaw Quality Of Stallion Sperm, Kelli Lynn Matheny
Effects Of Resveratrol On Post-Thaw Quality Of Stallion Sperm, Kelli Lynn Matheny
Theses and Dissertations
Current equine sperm cryopreservation methods fail to reliably prevent damages to important cellular structures such as the cell membrane and DNA. The objective of this study was to determine the effects of supplementing a stallion semen extender with 1 or 10 mM resveratrol on post-thaw sperm characteristics. Results showed that sperm death was increased with 10 mM compared to both the control and 1 mM (P < 0.05). DNA fragmentation was increased in the 1 mM treatment compared to the control (P < 0.05). ROS activity was reduced the most in the 10 mM with differences between all groups (P < 0.05). Membrane integrity was not different between groups (P > 0.05). Motility of the control was higher than the treatment groups (P < 0.05). Resveratrol was able to reduce ROS but was unable to preserve motility or viability at the concentrations tested.
Efficacy Of An Experiential, In-School Educational Program For Improving Elementary School Students' Attitudes And Knowledge About The Environment, Leslie M. Burger
Efficacy Of An Experiential, In-School Educational Program For Improving Elementary School Students' Attitudes And Knowledge About The Environment, Leslie M. Burger
Theses and Dissertations
Stagnant science achievement by students, greater demands and stresses on natural resources and environmental systems, and societal disengagement from nature highlight the need for education programs to ameliorate subsequent consequences. One attempt to address science performance and environmental apathy is Youth Environmental Science (YES), an environmental education program initiated in 2011 in a rural, minority-dominated, upper elementary school in Mississippi. The program provides five consecutive days (30 hours) of experiential learning in natural sciences. During 2011-2013, I studied cognitive and affective responses of fourth and fifth grade students to YES participation using a pretest-posttest-delayed posttest design. The influence of demographic …
Doing Math Homework: Case Studies Of Middle Class African American Families In One Elementary School, Candace Granderson Aldridge
Doing Math Homework: Case Studies Of Middle Class African American Families In One Elementary School, Candace Granderson Aldridge
Theses and Dissertations
Very limited research exists on middle class African American families doing math homework. The present study examines the real life experiences of African American families doing math homework, with special emphasis on emotional and motivational factors that contribute to African American homework practices. This study focuses on 3 African American middle class families, all in 1 elementary school, doing 4th grade math homework. Students in Grade 4 and their parents are interviewed to examine what math homework means to them and what they believe about math homework. In addition, two teachers are interviewed to provide their perspectives of the aforementioned …
Ecosystem Services Of Moist-Soil Wetlands: Water Quality Benefits And Crayfish Harvest, Economics And Consumer Acceptance, Amy Brooke Alford
Ecosystem Services Of Moist-Soil Wetlands: Water Quality Benefits And Crayfish Harvest, Economics And Consumer Acceptance, Amy Brooke Alford
Theses and Dissertations
I estimated yield, population metrics, production costs, and evaluated consumer acceptability and nutritive content of crayfish (Procambarus clarkii, P. zonangulus) harvested from moist-soil wetlands in the Lower Mississippi Alluvial Valley (MAV) during springs 2009-2011. I also compared nutrient and sediment concentrations and loads exported from moist-soil wetlands and nearest agriculture fields in the MAV during winters 2010-2012. Daily yield of crayfish from moist-soil wetlands was 2.4 kg (wet) ha-1 (SE = 0.50; 95% CI = 1.3-3.4). When graded by size, yield of large crayfish (> 30 g) from wetlands dominated by P. clarkii was four times greater (P < 0.05) than yield of large crayfish from wetlands dominated by P. zonangulus. Crayfish harvesting costs (2013 US dollars [$]) ranged from $405.69 ha-1 to $917.88 ha-1 and breakeven selling prices ranged from $3.74 kg-1 to $8.49 kg-1. Consumer acceptability, proximate composition, and total fatty acid content of P. clarkii did not differ (0.73 > P > 0.11) …
Cybersecurity Testing And Intrusion Detection For Cyber-Physical Power Systems, Shengyi Pan
Cybersecurity Testing And Intrusion Detection For Cyber-Physical Power Systems, Shengyi Pan
Theses and Dissertations
Power systems will increasingly rely on synchrophasor systems for reliable and high-performance wide area monitoring and control (WAMC). Synchrophasor systems greatly use information communication technologies (ICT) for data exchange which are vulnerable to cyber-attacks. Prior to installation of a synchrophasor system a set of cyber security requirements must be developed and new devices must undergo vulnerability testing to ensure that proper security controls are in place to protect the synchrophasor system from unauthorized access. This dissertation describes vulnerability analysis and testing performed on synchrophasor system components. Two network fuzzing frameworks are proposed; for the I C37.118 protocol and for an …
Data Driven Decision-Making And Principals' Perceptions, Melissa F. Mccray
Data Driven Decision-Making And Principals' Perceptions, Melissa F. Mccray
Theses and Dissertations
In this era of high stakes accountability, assessments are not only used as diagnostic tools, but they are also used to determine the effectiveness of school programs and personnel. Of the utmost importance is how principals use data to make instructional, intervention and planning decisions. The purpose of the current study was to determine principals’ perceptions regarding the importance, availability and utility of multiple sources of data in making their decisions and to determine their self-efficacy in M practices. This study was guided by 7 research questions and utilized 2 research designs. Descriptive research was used to answer research questions …
An Examination Of The Predictors Of General Recidivism, Violent Recidivism, And Property Recidivism Among Juvenile Offenders, Megan Suzanne Stubbs-Richardson
An Examination Of The Predictors Of General Recidivism, Violent Recidivism, And Property Recidivism Among Juvenile Offenders, Megan Suzanne Stubbs-Richardson
Theses and Dissertations
Although studies examining juvenile recidivism have focused primarily on violent recidivism, the factors that predict recidivism likely differ by offense type. To examine general, property, and violent recidivism, this study combined individual-level data (i.e., offender and case characteristics) from the Mississippi Youth Court Information Data System (MYCIDS) for the years 2009-2011 and contextual-level data (i.e., county characteristics) from the 2010 U.S. Census and the 2010 Uniform Crime Reports (UCR). Results showed that offender characteristics predicted only general and property recidivism, but case characteristics mattered for all three types (i.e., general, violent, and property recidivism). Contextual characteristics (i.e., the percentage of …
An Observation Of Displaced Manufacturing Workers In Their Transition For Successful Reemployment Through Community College Education/Retraining Programs, Christina Granderson
An Observation Of Displaced Manufacturing Workers In Their Transition For Successful Reemployment Through Community College Education/Retraining Programs, Christina Granderson
Theses and Dissertations
The economic changes that have occurred in this country over the course of this past decade have had a grave impact on manufacturing workers, which has forced many of these workers to transition into new career fields. As workers are faced with having to start new career paths, the community college has served as a hub of information and a source of inspiration to begin new careers. Through programs such as the federal Trade Adjustment Assistance (TAA) program, these dislocated workers are able to acquire a new skill or trade. A qualitative study will investigate how dislocated workers make a …
Analyzing Predictors Of Bullying Victimization At School, Hatice Cecen Celik
Analyzing Predictors Of Bullying Victimization At School, Hatice Cecen Celik
Theses and Dissertations
Bullying victimization in school settings is a serious problem in many countries including the United States. Bullying victimization has been associated with serious incidents of school violence as well as detrimental physical, psychological, emotional, and social consequences for its victims. Given its consequences, it is crucial to understand who is more likely to be targeted for bullying victimization. This study examines whether a number of important factors such as gender, physical and interactionist school security measures, and involvement in extracurricular activities influence individuals’ risk of bullying victimization from social bond and routine activity perspectives. The study employs the 2011 School …
Associative Nitrogen-Fixing Bacteria And Their Potential To Support The Growth Of Bioenergy Grasses On Marginal Lands, Jayani Jeewanthi Wewalwela
Associative Nitrogen-Fixing Bacteria And Their Potential To Support The Growth Of Bioenergy Grasses On Marginal Lands, Jayani Jeewanthi Wewalwela
Theses and Dissertations
Rising demands for both food and energy have lifted up the idea of producing renewable biofuels from bioenergy grasses that can companion with associative N2ixing bacteria. Associative N2ixing bacteria can partially fulfill the N requirements of bioenergy grasses enabling successful application for marginal lands. The overall objective of this study was to measure the potential N2ixation of bacteria associated with three bioenergy grasses, giant miscanthus (Miscanthus x giganteus), switchgrass (Panicum virgatum; ‘Alamo’) and energycane (hybrid of Saccharum spontaneum and S. officinarum; HO 02-147) as well as identifying N2ixing bacteria associated with these energy grasses and applying these isolates to grasses …
A Climatology Of Prescribed Burn Day Criteria For The Southeastern Us, Brandon Harold Sylvester
A Climatology Of Prescribed Burn Day Criteria For The Southeastern Us, Brandon Harold Sylvester
Theses and Dissertations
The United States has arbitrary weather criteria for a prescribed burn day to happen. This arbitrary criteria gives prescribed-burn managers a limited amount of days they can burn. To solve this, I established a 30-year climatology based on daily mixing height (m). I then calculated burn-day thresholds based on different mixing heights. I found seasonal and spatial patterns of the amount of days that are prescribed burns. Southeastern United States was my study area. A small decrease in threshold values will lead to large increases in prescribed burn days. Digital maps were created to show the spatial variability of prescribed …
Epidemiological Study Of The Factors That Influence Mortality And Economics On A Commercial Catfish Farm, Fred L. Cunningham
Epidemiological Study Of The Factors That Influence Mortality And Economics On A Commercial Catfish Farm, Fred L. Cunningham
Theses and Dissertations
A Catfish Management Database (CMD) was developed to analyze data from large commercial catfish farms. The CMD was developed so that data collected by the farm could be used for management of the farm and for identifying some of the risk factors associated with important bacteria diseases. This database was designed to 1) to incorporate production data already being recorded for generating reports for use at weekly managerial meetings focused on feeding rates, feed conversion ratios, mortalities and harvesting events 2) be easily used by a catfish farmer to collect management data in order to analyze production efficiency through a …
Episodically Defined Categories In The Organization Of Visual Memory, Karla B. Antonelli
Episodically Defined Categories In The Organization Of Visual Memory, Karla B. Antonelli
Theses and Dissertations
Research into the nature and content of visual long-term memory has investigated what aspects of its representation may account for the remarkable ability we have to remember large amounts of detailed visual information. One theory proposed is that visual memories are supported by an underlying structure of conceptual knowledge around which visual information is organized. However, findings in memory for visual information learned in a visual search task were not explained by this theory of conceptual support, and a new theory is proposed that incorporates the importance of episodic, task-relevant visual information into the organizational structure of visual memory. The …
Evaluation Of Effectiveness, Reproducibility, And Repeatability Of Using Dentition For Estimating Cattle Age, Timothy F. Best
Evaluation Of Effectiveness, Reproducibility, And Repeatability Of Using Dentition For Estimating Cattle Age, Timothy F. Best
Theses and Dissertations
Study objectives were to determine the effectiveness, reproducibility, and repeatability of dental evaluation for estimating cattle age. Cattle (n = 400) aged 1.5 to 20 yr were evaluated by 3 technicians for estimated age via dentition. A subset (n = 383) was aged again 4 wk later by the same observers. Age estimations were most accurate in YOUNG (< 5 yr old) cattle with at least 95.7% rate of accuracy within 2 yr across all observers and observation events. For MIDDLE (6 to 10 yr old) and OLD (> 10 yr old) cattle, these accuracies were 81.5 and 62.1%, respectively. Reproducibility proved high, with all observers consistently assigning age estimates within 1 yr of one another for more than 9 out of 10 YOUNG animals; all observers agreed on at …
Evaluation Of Herbicide Formulation And Spray Nozzle Selection On Physical Spray Drift, Jasper Lewis Cobb
Evaluation Of Herbicide Formulation And Spray Nozzle Selection On Physical Spray Drift, Jasper Lewis Cobb
Theses and Dissertations
New transgenic crops are currently being developed which will be tolerant to dicamba and 2,4-D herbicides. This technology could greatly benefit producers who are impacted by weed species that have developed resistance to other herbicides, like glyphosate-resistant Palmer Amaranth. Adoption of this new technology is likely to be rapid and widespread which will lead to an increase in the amount of dicamba and 2,4-D applied each season. It is well-documented that these herbicides are very injurious to soybeans, cotton, tomatoes, and most other broadleaf crops, and their increased use brings along increased chances of physical spray drift onto susceptible crops. …
Examining Hepatic Steroid Inactivation And Luteal Function Throughout Bovine Pregnancy, Caitlin G. Hart
Examining Hepatic Steroid Inactivation And Luteal Function Throughout Bovine Pregnancy, Caitlin G. Hart
Theses and Dissertations
The objective of this study was to examine hepatic steroid inactivation and luteal function throughout bovine gestation. In pregnant beef cows, cytochrome P450 3A activity decreased from mid- to late-gestation, while progesterone concentrations tended to increase from mid- to late-gestation. Uridine diphosphate-glucuronosyltransferase activity per kg of body weight was increased in pregnant vs non-pregnant dairy cows. Total corpus luteum (CL) blood perfusion tended to be increased in pregnant vs non-pregnant dairy cows. Hepatic portal blood flow per kg of body weight was increased in pregnant vs non-pregnant dairy cows. Hepatic steroid inactivating enzyme activity, CL blood perfusion, and portal blood …
Inspection Of Timber Bridge Longitudinal Decks With Ground Penetrating Radar, Brian K. Brashaw
Inspection Of Timber Bridge Longitudinal Decks With Ground Penetrating Radar, Brian K. Brashaw
Theses and Dissertations
Advanced nondestructive inspection techniques like stress wave timing and resistance microdrilling have been used to successfully inspection timber bridges, but it is most effective on girder style bridges. There is a noted need to develop additional inspection techniques for longitudinal deck/slab timber bridges, which comprise about 20% of the national bridge inventory. One technique that holds potential is ground penetrating radar, a recognized nondestructive testing technique that has been used effectively for many different environmental and transportation applications. It has been utilized successfully to identify buried objects, internal defects and material changes. The objective of this research was to assess …
Intensification As A Survival Strategy For Early Settlers On The Tombigbee National Forest, Jessica L. Gisler
Intensification As A Survival Strategy For Early Settlers On The Tombigbee National Forest, Jessica L. Gisler
Theses and Dissertations
This thesis investigates the relationship between success and access to children, slaves, and kin as labor sources during the period of 1833 to 1865 in northeast Mississippi. The theoretical concepts of agricultural intensification and relative intensity were used to measure variability among the households. Artifacts from seven archaeological sites were used to establish mean dates. These sites were tied to their original occupants through historic records. A historic document search revealed the number of slaves and children each family had, and whether they had kin living nearby. Agricultural census records showed the productivity of each farm during the study period. …
Investigating Knowledge And Behavior Intention Among Ghanaian Smallholder Farmers, Alyssa Marie Barrett
Investigating Knowledge And Behavior Intention Among Ghanaian Smallholder Farmers, Alyssa Marie Barrett
Theses and Dissertations
Rural farmers in developing countries lack knowledge, access to educational resources, and capacity to stay informed of and implement current farming and health practices. The purpose of this research was to determine the effect of an educational program on the utilization of native plants in farming and health practices among rural farmers in Ghana. The research objectives were to describe the population, assess farmers’ knowledge of farming and health practices, describe participants’ current and planned behavior, and observe the implementation of the practices taught. Results indicated participants’ knowledge of farming and health practices increased after the workshops. Results also indicated …
Investigating Melatonin Supplementation On Maternal Hemodynamics And Offspring Programming, Katelyn E. Brockus
Investigating Melatonin Supplementation On Maternal Hemodynamics And Offspring Programming, Katelyn E. Brockus
Theses and Dissertations
The objective was to examine effects of melatonin supplementation during late gestation on uterine artery hemodynamics, offspring growth, and endocrine profiles. Prior to day 170 of gestation, heifers were trained to the Calan feeding system. On day 190 of gestation, heifers (n = 20) were blocked by BW and then randomly assigned to one of two dietary treatments: 1) 20 mg of dietary melatonin per day (MEL) or 2) no melatonin supplementation (CON). Supplementation ceased on day 262 of gestation. A main effect (P < 0.01) of treatment was observed for total uterine artery blood flow with it being increased in MEL vs. CON. An interaction (P = 0.008) was observed in calf body weight increasing at weeks 8 and 9 in MEL vs. CON. Dietary melatonin could be used to potentially increase uterine blood flow and calf body weight.
Investigation Of The Beneficial Effect Of Enterobacter Cloacae Strain Jd6301 On Mice Challenged With Escherichia Coli O157:H7, Jessica Grissett Wilson
Investigation Of The Beneficial Effect Of Enterobacter Cloacae Strain Jd6301 On Mice Challenged With Escherichia Coli O157:H7, Jessica Grissett Wilson
Theses and Dissertations
The environment of the gastrointestinal (GI) tract is an extremely complex system made up of not only host cells, but also many beneficial microbes. Disruption of this environment can often lead to disorders and health issues. To help balance this system, probiotics have often been administered to both humans and animals, such as livestock. This study aimed to determine what beneficial effects a novel strain of Enterobacter cloacae, strain JD6301, could offer to a host in the presence of an enteric infection with E. coli O157:H7. Upon administration of JD6301, supplemented animals had overall less E. coli present in the …
Factors That Influence A High School Student's College Choice In A Rural Area In Mississippi, Amanda Lanier Walton
Factors That Influence A High School Student's College Choice In A Rural Area In Mississippi, Amanda Lanier Walton
Theses and Dissertations
The objective of this study is to determine the factors that affect recruitment in community colleges and how community colleges can be competitive in the recruitment process. In recent years, community colleges have become more competitive in their tuition rates, course schedules, program offerings, and athletics. Therefore, community college recruiters are given the difficult task of vying for top students and athletes. Additionally, with the current economic situation, more students are returning to school to acquire an education or a trade so that they can have an advantage when applying for jobs. As a result, colleges are challenged to find …