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The Impact Of Utilizing Peer Mentoring Interactions, New Laboratory Experiments, And Writing-To-Learn Practices In Undergraduate Chemistry Education, Dulani Samarasekara
The Impact Of Utilizing Peer Mentoring Interactions, New Laboratory Experiments, And Writing-To-Learn Practices In Undergraduate Chemistry Education, Dulani Samarasekara
Theses and Dissertations
High attrition rates in Science, Technology, Engineering, and Mathematics (STEM) fields are major challenges in undergraduate education. Many students enrolled in STEM fields end up switching their majors to non-STEM fields or leave college without earning any academic qualification. Due to these reasons, the United States is facing a critical shortage of future talented STEM personnel in the domestic workforce. Therefore, graduating a sufficient number of talented students in STEM fields has come to national attention. It is important to examine strategies for improving STEM-major retention and undergraduate education in STEM disciplines. The main purpose of this study was to …
Information Retrieval From Spaceborne Gnss Reflectometry Observations Using Physics- And Learning-Based Techniques, Orhan Eroglu
Information Retrieval From Spaceborne Gnss Reflectometry Observations Using Physics- And Learning-Based Techniques, Orhan Eroglu
Theses and Dissertations
This dissertation proposes a learning-based, physics-aware soil moisture (SM) retrieval algorithm for NASA’s Cyclone Global Navigation Satellite System (CYGNSS) mission. The proposed methodology has been built upon the literature review, analyses, and findings from a number of published studies throughout the dissertation research. Namely, a Sig- nals of Opportunity Coherent Bistatic scattering model (SCoBi) has been first developed at MSU and then its simulator has been open-sourced. Simulated GNSS-Reflectometry (GNSS-R) analyses have been conducted by using SCoBi. Significant findings have been noted such that (1) Although the dominance of either the coherent reflections or incoher- ent scattering over land is …
Supporting Student Success In Chemistry Using Peer Mentoring, Laboratory Experiments, And Eye-Tracking Analysis, Viveka Lakruwani Perera
Supporting Student Success In Chemistry Using Peer Mentoring, Laboratory Experiments, And Eye-Tracking Analysis, Viveka Lakruwani Perera
Theses and Dissertations
Active participation in the learning process enhance students’ critical thinking and problem-solving skills. We implemented peerocused, active learning, recitation sessions with the large-enrollment sections for General Chemistry I courses at Mississippi State University (MSState) over a period of four semesters beginning in Spring 2016. The peerocused recitation program was a success improving student final (standardized ACS) exam scores, pass/fail rates for the course, and continuation on to General Chemistry II (CH 1223) courses. Peerocused collaborative learning and students possessing ownership over their learning significantly enhanced academic outcomes of our program. Worked-example effect is the best known and apparently the most …
Characterization Of Fatty Acid Composition Of Bull Sperm With Varied Cryotolerance, Holly Evans
Characterization Of Fatty Acid Composition Of Bull Sperm With Varied Cryotolerance, Holly Evans
Theses and Dissertations
The objectives of this study were to determine fatty acid composition and acrosome status from bull sperm with different freezabilities (n = 12). We hypothesized that lipid fractions had differentiated fatty acid compositions and such differences influence sperm freezability and the sperm acrosome. Fatty acids were extracted from fresh frozen sperm and fractionated by solid-phase extraction. Thirtyour fatty acids were quantified. Saturated fatty acids were predominant, accounting for 71 to 80% of fatty acids in both fractions. Differences in composition between fractions existed (P < 0.001). Branched chain fatty acid concentrations (15 to 18 µg) were almost twice that of polyunsaturated fatty acid concentrations found in the polar fractions (8 to 9 µg; P < 0.001). Sperm with differentiated freezabilities had few differences in 22:0, 18:1 cis 9, and 14:0 13-methyl fatty acids (P ≤ 0.011). Analyses of acrosome status of sperm revealed that acrosomes were affected differently among bulls.
Service And Empathy: A Comparison Study Of Intercultural Experiences Among Students At Mississippi College, Victoria Rose Marshall
Service And Empathy: A Comparison Study Of Intercultural Experiences Among Students At Mississippi College, Victoria Rose Marshall
Theses and Dissertations
Service to the community is a key element in mission statements of public and private universities. In the 21st century, higher education shifted by establishing community engagement offices and encouraging student community service through service-learning. Previous literature indicated that experiential learning increased ethnocultural empathy and volunteerism among college students. This study compares two experiential learning programs’ influence on the ethnocultural empathy development among college students at Mississippi College, a private, religious-affiliated university to explore how this empathy increases community service. 38 students were asked to complete the Scale of Ethnocultural Empathy (Wang et al. 2003) and were interviewed about their …
Understanding Large Strain Deformation Behavior Of Physically Assembled Triblock [Aba] Copolymer Gels In B-Selective Solvents, Satish Mishra
Understanding Large Strain Deformation Behavior Of Physically Assembled Triblock [Aba] Copolymer Gels In B-Selective Solvents, Satish Mishra
Theses and Dissertations
Physically assembled gels are widely applicable in the food industry, biomedical devices, drug delivery, and soft robotics due to their tunable mechanical properties and thermoreversibility. The mechanical responses of these gels originate from their microstructure. Therefore, factors affecting the gel microstructure like polymer molecular weight, solvent quality, and polymer concentration play a significant role in determining their mechanical behavior. Gel microstructure also changes during the deformations resulting in a deviation from the structure-property relationship established for the low deformations. During large deformations, other factors like stress relaxation, poroelasticity, and polymer chain entanglement contribute significantly to the gel response. This complexity …
High School Teacher’S Acceptance Of Technology And Privacy Concerns In The 1:1 Initiative Laptop Program, Ronald Gatewood Jr
High School Teacher’S Acceptance Of Technology And Privacy Concerns In The 1:1 Initiative Laptop Program, Ronald Gatewood Jr
Theses and Dissertations
Prior research has shown teachers’ attitudes, teachers’ preparation for using technology, and the availability of technology had significant positive associations with technology integration. However, research has shown that teachers do not fully utilize technology, they fail to implement it thoroughly due to a lack of time needed for planning the implementation of technology into the curriculum, and they do not have adequate training which contributes to underutilization of technology. Due to a lack of research from the teachers’ perspective of technology acceptance, the purpose of this study was to examine high school teachers’ acceptance and use of technology and determine …
Perceptions Of Food, Supportive Resistance Resources, And Nutrition Knowledge Of Bariatric Surgery Patients, Savannah K. Walker
Perceptions Of Food, Supportive Resistance Resources, And Nutrition Knowledge Of Bariatric Surgery Patients, Savannah K. Walker
Theses and Dissertations
Adult overweight and obesity is a life-threatening health concern worldwide. Bariatric surgery is a successful treatment for severely obese individuals however, there is a moderate risk for weight regain. This study evaluated perception of food, supportive resistance resources, and nutrition knowledge, which play important roles in successful weight loss post bariatric surgery. Participants completed a three-part questionnaire at three time intervals: prior to surgery, 2 months post-surgery, and 5 months post-surgery. Results show that bariatric patients’ eating behavior significantly changes post bariatric surgery, but a disordered perception of food remains. Bariatric surgery patients believe support from significant others and family …
The Binding Modes Of Diminazene Aceturate With C-Myc G-Quadruplexes, Jerrano Bowleg
The Binding Modes Of Diminazene Aceturate With C-Myc G-Quadruplexes, Jerrano Bowleg
Theses and Dissertations
Interactions between DNA and ligands are important in the rational design of drugs and in research into DNA function. In particular, the interaction of DMZ with DNA structures named “G-quadruplexes” was considered. G-quadruplexes are structures present in telomeres and several oncogenes. The main purpose of this project was to provide a computational tool to study DNA ligand interactions using a variety of molecular modeling techniques that include molecular docking, molecular dynamics simulations (MD) and MM/PBSA (Molecular Mechanics/Poisson Boltzmann Surface Area). We investigated the binding modes and binding affinities of DMZ with c-MYC G-quadruplexes (G4s). We found that the conformation and …
The Effect Of Maternal Nutrition And Genetic Background On Myogenic And Adipogenic Development In Skeletal Muscle Of Angus And Brahman Cattle Offspring, Racheal L. Lemire
The Effect Of Maternal Nutrition And Genetic Background On Myogenic And Adipogenic Development In Skeletal Muscle Of Angus And Brahman Cattle Offspring, Racheal L. Lemire
Theses and Dissertations
The objective of this study was to determine breed specific effects of nutritional insults during gestation on regulation of muscle and adipose tissue growth in beef cattle offspring during fetal and early postnatal development. Angus and Brahman heifers were randomly assigned to 1 of 2 dietary treatments consisting of 100% or 60% based on net energy requirements for gestating heifers. Nutritional treatments were imposed from day 50 to 180 of gestation. Fetuses harvested at 180 days of gestation had smaller frames and spared critical organs. Gene expression in several fetal tissues indicated potential for compensatory growth. Postnatally, Brahman offspring weighed …
The Effects Of Impure Water Sources On The Early-Age Properties Of Calcium Sulfoaluminate Cements, Wendy Long
The Effects Of Impure Water Sources On The Early-Age Properties Of Calcium Sulfoaluminate Cements, Wendy Long
Theses and Dissertations
One of the benefits of calcium sulfoaluminate (CSA) cements is that these materials gain strength rapidly, where strength development is often measured in hours instead of days. This property makes these materials desirable for use in temporary, non-reinforced repairs of roadways, airfields, and navigable locks. The rapid repair of these infrastructure elements is critical to transporting supplies into regions devastated by disaster. In these austere environments, potable water may not be available in sufficient quantities to make vital repairs, and the use of impure water in the production of CSA cement-based concrete would be advantageous. However, the hydration products formed …
Numerical Modeling Of Effects Of Extreme Precipitation And Flooding On Earthen Levees Under A Changing Climate, Firas Jasim
Numerical Modeling Of Effects Of Extreme Precipitation And Flooding On Earthen Levees Under A Changing Climate, Firas Jasim
Theses and Dissertations
Adaptation to climate change requires a careful evaluation of the infrastructure performance under extreme events in a changing climate. Earthen levees are critical infrastructure systems, which play a vital role to the country’s safety, environment, and economic security. The main objective of this study is to quantitatively assess the integrity of earthen levees subject to extreme precipitation and flooding under a changing climate. A multi-disciplinary modeling framework is developed and applied to two earthen levees, Elkhorn and Sherman Island levees, in California. Patterns of extreme precipitation and flooding are obtained for the study areas under current and future climate. A …
Effects Of The In Ovo Injection Of Vitamin D3 Sources On The Hatchability, Performance, Breast Meat Yield, Small Intestine Morphology, And Immunity Of Ross 708 Broilers Subjected To Dietary Insufficiency And Pathogenic Agents, Seyed Abolghasem Fatemi
Effects Of The In Ovo Injection Of Vitamin D3 Sources On The Hatchability, Performance, Breast Meat Yield, Small Intestine Morphology, And Immunity Of Ross 708 Broilers Subjected To Dietary Insufficiency And Pathogenic Agents, Seyed Abolghasem Fatemi
Theses and Dissertations
Effects of varying dosages (0.6 to 4.8 μg/egg) of vitamin D3 (D3) and 25-hydroxycholecalciferol (25OHD3), administrated by in ovo (amniotic) injection, on various embryonic and post-hatch physiological variables in Ross 708 broilers were investigated. The in ovo injection of 1.2 to 4.8 μg of both D3 and 25OHD3 increased serum 25OHD3 concentrations in broiler embryos in comparison to non-injected and diluent-injected control groups. Furthermore, the effects of 2.4 μg of D3 and 25OHD3 alone and in combination on the performance, meat yield and quality, small intestine morphology, and immunity of the broilers fed a diet restricted in calcium and phosphorous …
Enhanced Controllers For Voltage-Sourced Converters Interfaced With Weak Ac Power Grids, Sushil Silwal
Enhanced Controllers For Voltage-Sourced Converters Interfaced With Weak Ac Power Grids, Sushil Silwal
Theses and Dissertations
Many distributed energy resource (DER) systems are remotely located and are often interfaced at low or medium voltage levels through power electronics converters such as voltage-sourced converters (VSC). Therefore, a weak-grid situation is encountered where the voltage and frequency at the point of DER coupling can experience fluctuations. A power converter designed to operate in normal and strong grid conditions may not perform satisfactorily during such weak and distorted grid conditions. Hence, considering the full dynamics of the system during weak-grid conditions in the design of converter control is indispensable to ensure the stability of the DER and the grid. …
Evaluating The Applicability Of Deep Learning Techniques In Agricultural Systems Modeling, Babak Saravi
Evaluating The Applicability Of Deep Learning Techniques In Agricultural Systems Modeling, Babak Saravi
Theses and Dissertations
A rapidly expanding world population and extreme climate change have made food production a crucial challenge in the twentyirst century. Therefore, improving crop production through agricultural management could be an effective solution for this challenge. However, due to the associated cost and time to perform field works, researchers widely rely on agricultural system modeling to examine the impacts of different crop management scenarios. However, due to the complexity of agricultural system modeling, their applications in producing practical knowledge for producers are limited. Concurrently, deep learning techniques have been recognized as a preferred method when dealing with large datasets. This study …
Evaluation And Development Of Effective Tank Cleanout Procedures Following Dicamba Use, Zachary Carpenter
Evaluation And Development Of Effective Tank Cleanout Procedures Following Dicamba Use, Zachary Carpenter
Theses and Dissertations
Sprayer hygiene and concerns of off-target injury from auxin herbicides have increased in recent years. New auxin tolerant crops have broadened the use patterns of these herbicides. Therefore, experiments were conducted across two locations in Mississippi in 2016, 2017, and 2018 to evaluate sprayer cleanout procedures to aid in dicamba removal. Standard sprayer cleanout consisted of a triple rinse of 10% tank volume, with either a tank cleaner or ammonia added in the second rinse. Samples collected in each rinse step for all treatments were applied to actively growing soybean and dicamba concentration quantified with HPLC. Experiments were conducted to …
Examining The Effect Of Program Design On Career And Technical Program Completion, Technical Skill Attainment And Job Placement, Jennifer Candace Weaver
Examining The Effect Of Program Design On Career And Technical Program Completion, Technical Skill Attainment And Job Placement, Jennifer Candace Weaver
Theses and Dissertations
Community college career and technical education programs struggle with meeting federallyunded Perkins performance measures. To address this need the 30-45-60 program design was developed. The study purpose was to determine if the 30-45-60 program design influenced career certificate, technical certificate or Associate of Applied Science degree completion rates, technical skill attainment, and job placement rates for students enrolled in the welding, precision machining and manufacturing and electrical technology programs. A Chi-square test of independence indicated no significantly significant relationship between the 30-45-60 program design and completion of a certificate or degree (p = .222). A closer look revealed no significantly …
Family Firm Selection: A Relational Perspective, William Elliot Tabor
Family Firm Selection: A Relational Perspective, William Elliot Tabor
Theses and Dissertations
This study focuses on the hiring of nonfamily employees in family firms. Research to date has emphasized the challenges family firms confront in attracting and selecting quality nonfamily human capital. This literature has emphasized the limitations these firms face due to the information asymmetries common to the hiring process. However, this research has not considered the advantages available to family firms through their social network. Drawing on agency theory, I hypothesize that owner referral utilization mediates the relationship between family essence and firm performance because their use lessens the agency conflicts between owners and nonfamily members. Utilizing a sample of …
Flexural Bending Test Of Topology Optimization Additively Manufactured Parts, Mohammed Afify
Flexural Bending Test Of Topology Optimization Additively Manufactured Parts, Mohammed Afify
Theses and Dissertations
The aim of this work is to model, manufacture, and test an optimized Messerschmitt-BölkowBlohm beam using additive manufacturing. The implemented method is the Solid Isotropic Material with Penalization of a minimum compliance design. The Taubin smoothing technique was used to attenuate geometric noise and minimize the formation of overhanging angles and residual stresses due to the thermal activity of the selective laser melting process. The optimized model required examination and repair of local errors such as surface gaps, non-manifold vertices, and intersecting facets. A comparison between experimental and numerical results of the linear elastic regimes showed that the additively manufactured …
Baseline Free Structural Health Monitoring Using Modified Time Reversal Method And Wavelet Spectral Finite Element Models, Nimesh Jayakody
Baseline Free Structural Health Monitoring Using Modified Time Reversal Method And Wavelet Spectral Finite Element Models, Nimesh Jayakody
Theses and Dissertations
The Lamb wave based, non-contact damage detection techniques are developed using the Modified Time Reversal (MTR) method and the model based inverse problem approach. In the first part of this work, the Lamb wave-based MTR method along with the non-contacting sensors is used for structural damage detection. The use of non-contact measurements for MTR method is validated through experimental results and finite element simulations. A novel technique in frequency-time domain is developed to detect linear damages using the MTR method. The technique is highly suitable for the detection of damages in large metallic structures, even when the damage is superficial, …
A Modular Open-Source Pre-Processing Tool For Finite Element Simulations Of Additive Manufacturing Processes, William Furr
A Modular Open-Source Pre-Processing Tool For Finite Element Simulations Of Additive Manufacturing Processes, William Furr
Theses and Dissertations
Additive manufacturing has shown the ability to produce highly complex geometries that are not easily manufactured through traditional means. However, the implications of building these complex geometries regarding thermal history requires more attention. AM process simulations have proven to be computationally expensive and require large amounts of pre-processing to execute. This thesis will start with a review of additive manufacturing along with current modeling efforts. Then, the development of a pre-processing tool for finite element simulations of these processes is presented. It is shown that the pre-processing tool significantly decreases the total time-to-simulation by removing manual steps. Finally, a study …
The Impact Of A Freshman Orientation Program On Academic Achievement For Students Enrolled In A Community College, James Gray
Theses and Dissertations
The purpose of this quantitative study was to explore the effectiveness of a freshman orientation program on second-semester retention, second-year retention, and cumulative GPA for students enrolled in a community college in the Deep South. The problem addressed in this study is a lack of sufficient academic and social support for college students, limiting their ability to remain in school and with high levels of academic performance (Nora & Crisp, 2007). For this study, the following research questions were analyzed: (1) Are there differences in 1st to 2nd semester retention for program completers with a 17-18 ACT as compared to …
Multi-Platform Comparison Of Canopy Reflectance On Corn Whole Plant And Leaf Tissue Nitrogen Status, Zachary Thomas Sumner
Multi-Platform Comparison Of Canopy Reflectance On Corn Whole Plant And Leaf Tissue Nitrogen Status, Zachary Thomas Sumner
Theses and Dissertations
Single-rate blanket application of fertilizer nitrogen (N) can result in an over or under application. Variable rate (VR) applications tailored to actual crop demands can improve N use efficiency in spatially variable soils. The objective of this study was to compare and improve relationships derived between corn canopy reflectance and corn N status acquired with two sensing platforms. Four fertilizer N rates were used, from deficient to excess, to create varying corn N status. Sensing and biophysical sampling was taken throughout the season for analysis and comparison to calculated vegetation indices (VIs). Results show strong relationships between VIs and corn …
Attributes Affecting Adoption Of Pollinator Conservation Practices, Shannon M. Westlake
Attributes Affecting Adoption Of Pollinator Conservation Practices, Shannon M. Westlake
Theses and Dissertations
Pollinator conservation has recently become a topic of greater interest and research around the world as native insect pollinator species increasingly face population declines. In the United States, growing concerns regarding food security and decreased biodiversity have led to the creation of programmatic and best management practices (BMPs) promotional efforts among governmental and non-governmental organizations. These efforts seek to support pollinators on public and private lands by addressing the primary causes of decline (e.g., habitat loss and increased chemical use). Although these organizations have worked diligently to increase awareness and applicability of programs to private landholders, there is still a …
Analysis Of Open Test Section Flow In A Closed Return Wind Tunnel, Salma Mfaddel
Analysis Of Open Test Section Flow In A Closed Return Wind Tunnel, Salma Mfaddel
Theses and Dissertations
Mississippi State University has a subsonic closed return wind tunnel facility with an open test section configuration. This research analyzes the test section flow quality using a numerical approach and explain how the diffuser's collector suppresses unsteadiness. Previous experiment assessed the flow quality at the wind tunnel without the collector, and velocity was measured using a pitot-static probe and hot wire. The results show a numerical comparison between the two configurations, with and without the collector, understand the effect of the diffuser 's collector on steadiness and uniformity. This paper will describe the wind tunnel facility and give further details …
Engineering Pathological Microenvironments For Cardiovascular Disease Studies, Ojaswee Adhikari
Engineering Pathological Microenvironments For Cardiovascular Disease Studies, Ojaswee Adhikari
Theses and Dissertations
Food insecurity is a growing issue in the United States. Iron deficiency is the most common form of nutritional deficiency in patients with endothelial dysfunction and vascular-related diseases. This preliminary study lays the groundwork for the “Nutrient deficiency-on-a-chip” model. Endothelial cells are cultured on mechanically tunable, enzymatically cross-linked gelatin and treated with deferoxamine, an iron chelator, or angiotensin II were used to simulate a nutrient deficient and diseased environment, respectively. As oxidative stress and disturbed barrier function are the most prevailing mechanism of angiotensin II and iron deficiency induced endothelial dysfunction, to test our model we investigated the changes in …
Exploring United Methodist Adults’ Racial Attitudes And Beliefs From A Critical Race Framework To Inform Outreach Efforts With Low-Income, Black Youth In Mississippi, Brittany Radford
Theses and Dissertations
Extensive literature has documented The United Methodist Church’s’ (UMC) commitment to social justice. A current focus in the church is working with economically marginalized populations, including the 231,170 Black children and youth in Mississippi. To better understand adults that serve this population, I conducted an exploratory study to gather baseline data about UMC adults’ contemporary attitudes and beliefs about race, racism, and discrimination. A cross-sectional survey was administered at the 2017 Mississippi Annual Conference of The UMC. Using a critical race lens, I found that most of the attendees espoused moderate color-blind racial attitudes and beliefs about the frequency that …
Fraze Mowing For Overseeding Establishment And Removal Of Perennial Ryegrass, Matthew Carpenter
Fraze Mowing For Overseeding Establishment And Removal Of Perennial Ryegrass, Matthew Carpenter
Theses and Dissertations
Fraze mowing offers a new tool used in both overseeding establishment and removal of perennial ryegrass (Lolium perenne L.). Research objectives were to determine the most effective timing of fraze mowing in overseeding establishment and removal, as well as to compare fraze mowing to other establishment and removal methods. Fall overseeding studies suggest that fraze mowing and scalping in mid-October provides the fastest establishment of ryegrass. However, by mid-March all treatments led to visually similar results. When evaluating removal timings, fraze mowing performed in early- and late-May led to faster visual bermudagrass recovery than March and April timings. Early-season application …
Durability Characteristics Of Asphalt Mixtures Containing Bioditives, Amanda Hufft
Durability Characteristics Of Asphalt Mixtures Containing Bioditives, Amanda Hufft
Theses and Dissertations
This thesis is focused on determining the durability characteristics of asphalt mixtures containing bio-based additives for the purpose of more effective use of recycled materials. Fifty mixtures were evaluated by Cantabro Mass Loss testing in their virgin state, after 1 year of field aging, and after laboratory conditioning to determine the effectiveness of bioditives in dense graded asphalt and sand asphalt mixtures. Key findings from this work demonstrated that considerable amounts of recycled asphalt shingles (i.e. 5% of the total mixture) significantly affect the brittleness of dense graded asphalt mixtures when used in conjunction with reclaimed asphalt pavement (RAP). Furthermore, …
Tcb Minimizing Model Of Computation (Tmmc), Naila Bushra
Tcb Minimizing Model Of Computation (Tmmc), Naila Bushra
Theses and Dissertations
The integrity of information systems is predicated on the integrity of processes that manipulate data. Processes are conventionally executed using the conventional von Neumann (VN) architecture. The VN computation model is plagued by a large trusted computing base (TCB), due to the need to include memory and input/output devices inside the TCB. This situation is becoming increasingly unjustifiable due to the steady addition of complex features such as platform virtualization, hyper-threading, etc. In this research work, we propose a new model of computation - TCB minimizing model of computation (TMMC) - which explicitly seeks to minimize the TCB, viz., hardware …