Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Physical Sciences and Mathematics (1241)
- Social and Behavioral Sciences (1165)
- Life Sciences (1131)
- Engineering (950)
- Arts and Humanities (623)
-
- Education (511)
- Medicine and Health Sciences (362)
- Earth Sciences (339)
- Electrical and Computer Engineering (311)
- Plant Sciences (277)
- Environmental Sciences (274)
- Psychology (255)
- Sociology (228)
- Animal Sciences (197)
- Computer Sciences (194)
- Agronomy and Crop Sciences (186)
- Business (184)
- Communication (182)
- Food Science (173)
- Civil and Environmental Engineering (162)
- Physics (162)
- Agriculture (157)
- Chemistry (153)
- Biochemistry, Biophysics, and Structural Biology (147)
- Materials Science and Engineering (147)
- Geology (146)
- Higher Education (135)
- Educational Assessment, Evaluation, and Research (127)
- Geography (124)
- Public Affairs, Public Policy and Public Administration (120)
- Institution
- Keyword
-
- Applied sciences (332)
- Biological sciences (285)
- Social sciences (283)
- Etc (250)
- Education (245)
-
- Manuals (231)
- Pure sciences (160)
- Health and environmental sciences (159)
- Earth sciences (153)
- Arkansas (119)
- Communication and the arts (108)
- Psychology (96)
- Rice (60)
- Philosophy (49)
- Academic achievement (44)
- Language (41)
- Religion and theology (41)
- Soybean (39)
- Gender (36)
- Poultry (36)
- Literature and linguistics (35)
- Reading (Elementary) (34)
- Art (32)
- Sustainability (32)
- Kindergarten (30)
- Machine learning (30)
- Heat Transmission (28)
- Machine Learning (28)
- Reading comprehension (27)
- First grade (Education) (26)
- Publication Year
- File Type
Articles 211 - 240 of 7596
Full-Text Articles in Entire DC Network
Privacy Protection In Cloud-Based Biometric Systems, Yatish Reddy Dubasi
Privacy Protection In Cloud-Based Biometric Systems, Yatish Reddy Dubasi
Graduate Theses and Dissertations
The widespread adoption of server-based biometric authentication systems, often hosted in the cloud, has introduced significant privacy risks. While these systems offer convenience, they require storing sensitive biometric templates on remote servers, creating a high-value target for adversaries. Unlike passwords, compromised biometric data is immutable and cannot be reissued, leading to an irreversible loss of privacy. This threat is exacerbated by template inversion attacks, which can reconstruct a user's original biometric trait (e.g., a face image) from its stored feature vector. This dissertation addresses these critical privacy challenges by designing, implementing, and evaluating a suite of novel frameworks for privacy-preserving …
Ecological Elemental Homeostasis And Stoichiometric Shifts: Biotic Responses To Ionic And Viral Stress, Samuel Anthony Tooru Dias
Ecological Elemental Homeostasis And Stoichiometric Shifts: Biotic Responses To Ionic And Viral Stress, Samuel Anthony Tooru Dias
Graduate Theses and Dissertations
Anthropogenic activities are reshaping the elemental composition of freshwater ecosystems, often creating stoichiometric imbalances that influence the growth, physiology and interactions of aquatic organisms. Ecological stoichiometric theory (EST) provides a framework for examining these changes by linking organismal elemental regulation to broader ecosystem processes. While traditionally focused on elements, such as carbon (C), nitrogen (N), and phosphorus (P), emerging stressors highlight the need to expand this framework to be more elementally inclusive for the examination of novel interactions. My dissertation integrates abiotic (salinization) and biotic stressors (viral infection) into an EST framework to evaluate how these factors alter elemental regulation …
Fungicidal Management Of Spring Dead Spot Using Improved Modeling And Application Strategies, Michael Vincent Battaglia
Fungicidal Management Of Spring Dead Spot Using Improved Modeling And Application Strategies, Michael Vincent Battaglia
Graduate Theses and Dissertations
Spring dead spot (SDS) is a destructive disease of bermudagrass (Cynodon Rich. spp.) in parts of the world that experience winter dormancy. Fungicides are often necessary to properly manage SDS, and significant research has been conducted to improve fungicidal effectiveness. Several studies were conducted with the objectives of improving fungicide application timing, method of fungicide application, and long-term fungicidal efficiency. In the fungicide application study, a cooling degree-day (CDD) model based on soil temperatures was developed. The CDD model showed that isofetamid was highly effective against SDS during a wide application window in autumn, while tebuconazole was inconsistently effective and …
Emotion Regulation Flexibility And Well-Being In College Athletes In Aesthetic Sports, Kaitlyn D. Chamberlain
Emotion Regulation Flexibility And Well-Being In College Athletes In Aesthetic Sports, Kaitlyn D. Chamberlain
Graduate Theses and Dissertations
This study examined emotion regulation flexibility and well-being (including psychological well-being, physical well-being, perceived sport performance and worth of sport participation) in athletes in aesthetic sports. This population experiences high environmental demands and constraints and thus low control over their environment. Collegiate athletes within aesthetic sports and female athletes experience specific social factors and demands that threaten their well-being, compared to those experienced by male athletes and athletes within non-aesthetic sports. Consistent with the transactional theory of stress and coping, individuals with less power to regulate their environment will require greater ability to regulate themselves in accordance with their changing …
Assessing Native Tallgrass Prairie Species As Main Roadside Vegetation In Arkansas, Sarah Paschal
Assessing Native Tallgrass Prairie Species As Main Roadside Vegetation In Arkansas, Sarah Paschal
Graduate Theses and Dissertations
Tallgrass prairies are among the most endangered ecosystems in North America, with Arkansas having lost over 99% of its native grasslands. This research evaluated the potential for using native tallgrass prairie species in Arkansas roadside vegetation. Two field experiments were conducted from 2022 to 2024. The first assessed seven native seed mixtures at three roadside locations (Clarksville, Huntsville, and Newport). Seed mixture composition significantly influenced establishment outcomes, with early-establishing forbs such as black-eyed Susan, partridge pea, and Illinois bundleflower performing well, though establishment varied by location. A second trial compared planting date (Autumn, Winter, Spring) and planting method (broadcast, drill …
Studies Of Trispyrazolylborate Molybdenum-Oxo Compounds And Related Reactions, Miranda Sanders
Studies Of Trispyrazolylborate Molybdenum-Oxo Compounds And Related Reactions, Miranda Sanders
Graduate Theses and Dissertations
This dissertation details the design, development, and synthesis of a molybdenum-dioxo complex bearing a trispyrazolylborate ligand. The system was tested for its efficiency as a catalyst for deoxydehydration with a small substrate scope. Deoxydehydration reactions with 1-phenyl-1,2-ethanediol, diethytartrate, and 1,2-octanediol show low yields with catalytic turnover only found for diethyltartrate. Electrochemical studies show well behaved PCET behavior with two distinct electron transfer events in the presence of a proton donor. Studies of two molybdenum-dioxo complexes bearing dianionic pincer ligands were conducted to expand further on systems that have been extensively studied in our lab. Deoxydehydration of glycerol by a molybdenum-dioxo …
Synthetic Dataset For Understanding Negation In Text-Guided Image Editing, Nhat-Tan Bui
Synthetic Dataset For Understanding Negation In Text-Guided Image Editing, Nhat-Tan Bui
Graduate Theses and Dissertations
Negation is a fundamental linguistic concept used by humans to convey information that they do not desire. Despite this, minimal research has focused on negation within text-guided image editing. This lack of research means that vision-language models (VLMs) for image editing may struggle to understand negation, implying that they struggle to provide accurate results. One barrier to achieving human-level intelligence is the lack of a standard collection by which research into negation can be evaluated. This thesis presents the first large-scale dataset, Negative Instruction (NeIn), for studying negation within instruction-based image editing. Our dataset comprises 366,957 quintuplets, i.e., source image, …
Supporting At-Risk Students Through Alternative Education: A Case Study On Reintegration, Behavior, And Stakeholder Perceptions At Sharpie Academy, Bryan O'Neal
Graduate Theses and Dissertations
This dissertation presents a mixed-methods case study examining the effectiveness of Sharpie Academy, an alternative education program within the Chalkboard Champions School District. The study investigated three central research questions: (1) How does participation in the alternative learning environment at Sharpie Academy influence students' behavior upon reintegration into the traditional education setting? (2) What are the perceptions of parents, teachers, and community members regarding the program's outcomes? (3) How do these perceptions influence stakeholder support for the academy? Data was collected from 121 participants, including 43 students and 78 adult stakeholders, using participant observation, semi-structured interviews, surveys, and document analysis. …
Bridging The Gap: Enhancing Institutional Support For Adjunct Faculty In Rural Community Colleges, Emily Joleen Mason
Bridging The Gap: Enhancing Institutional Support For Adjunct Faculty In Rural Community Colleges, Emily Joleen Mason
Graduate Theses and Dissertations
Adjunct faculty constitute approximately 70% of the academic workforce in U.S. higher education, yet they often face challenges related to professional isolation, limited institutional support, and insufficient onboarding. This qualitative study explores how institutional connectedness influences adjunct faculty retention at a rural community college in the Midwest. Using a phenomenological approach, the research investigates the lived experiences of adjunct faculty, focusing on onboarding processes, professional development opportunities, and institutional culture. Findings highlight the critical role of structured onboarding, mentorship, and continuous professional development in fostering engagement and retention among adjunct faculty. The study underscores the importance of inclusive institutional practices …
Free Radical Reactions Of Electron Rich Alkenes, David A. May Jr
Free Radical Reactions Of Electron Rich Alkenes, David A. May Jr
Graduate Theses and Dissertations
Radical reactions have known for over a century but have only been thought of as useful synthetic strategies for the last 70 years. During this period, much work has been done to develop theoretical explanations for their reactivity and modes of termination, resulting in them becoming a fundamental type of organic reaction in academia and industry. Previous studies by the McIntosh group have shown that a radical [1,3]-Rearrangement occurs when N-substituted pyridines are heated. Here, the scope of this new reaction is expanded to include polycyclic pyridines including neocuproine (2,9-dimethylphenanthroline) and 2-methylquinoline while also expanding the range of reactions available …
Increasing Soil Health In Zero-Grade, Flood-Irrigated Rice In Eastern Arkansas, Hannah Elizabeth Vickmark
Increasing Soil Health In Zero-Grade, Flood-Irrigated Rice In Eastern Arkansas, Hannah Elizabeth Vickmark
Graduate Theses and Dissertations
In an effort to build and maintain soil health and sequester soil C, many producers and researchers are turning towards regenerative management practices in agricultural systems, such as reduced tillage or no-tillage (NT), the implementation of winter cover crops (CC), and the use of organic or green manures, such as biochar. However, little research is being conducted on the long-term soil health and agronomic benefits of these practices in a flood-irrigated rice (Oryza sativa L.) production system. Three replications of seven treatment combinations were applied to 6.1 x 30.5 m rice plots. Baseline soil health properties were quantified at six …
Emotion Analysis And Neural Language Models For Classification, Andrew Mackey
Emotion Analysis And Neural Language Models For Classification, Andrew Mackey
Graduate Theses and Dissertations
Emotion analysis is a branch of artificial intelligence and natural language processing focused on recognizing emotions hidden throughout various forms of digital data, including text, images, and multi-modal representations. In this dissertation, we present four published and planned works that investigate different methodologies for natural language analysis tasks using deep learning techniques. The first published work we present considers the task of identifying fake news using various text and emotion representations. We demonstrate that emotion representations combined with word embedding techniques can improve the accuracy of fake news classification. Our second published work further investigates the fake news classification task …
Hyperspectral Indicators And Characterization Of Glyphosate-Induced Stress In Common Lambsquarters (Chenopodium Album L.), Mario Andrés Soto Valencia
Hyperspectral Indicators And Characterization Of Glyphosate-Induced Stress In Common Lambsquarters (Chenopodium Album L.), Mario Andrés Soto Valencia
Graduate Theses and Dissertations
Hyperspectral sensing enables detection of herbicide stress in weeds, but practical use requires strategies for redundancy control, rating variability management, and evaluator bias mitigation. This thesis evaluates common lambsquarters (Chenopodium album) under glyphosate exposure, aiming to identify key wavelengths, construct vegetation indices, and improve injury modeling. Greenhouse experiments used dimensionality reduction methods (principal component analysis, Relief F, Bayesian discriminant analysis) to isolate 34 unique wavelengths from about 3,200 bands. Calibration data were collected 14 days after treatment (DAT) to support wavelength selection and model development, while data from 27 DAT were used for independent validation. Class comparisons across six statistically …
Establishment Of Native Warm-Season Forages Using Organic Practices, Kolten Ray Wright
Establishment Of Native Warm-Season Forages Using Organic Practices, Kolten Ray Wright
Graduate Theses and Dissertations
Abstract Grassland agriculture is seen as a particularly sustainable form of agriculture. Many opportunities are known to use organic production methods or incorporate native warm-season grasses (NWSG) to accomplish both production goals and environmental or social outcomes. Environmental concerns have led some practitioners to question the use of organic methods to establish NWSG. As limited work has been accomplished in the northern bermudagrass belt, this project sought to compare organic establishment strategies for common NWSG species. A field trial conducted at the USDA ARS Dale Bumpers Small Farms Research Center in Booneville, AR found that NWSG establishment success in the …
Advanced Membrane Methods For Treatment Of Toxic Contaminants And Education Of Early-Career Researchers, Thomas Mckean Iii
Advanced Membrane Methods For Treatment Of Toxic Contaminants And Education Of Early-Career Researchers, Thomas Mckean Iii
Graduate Theses and Dissertations
Membrane technologies are attractive as they are linearly scalable and often require lower operating costs compared to other technologies. One area where they are particularly effective is the treatment of water contaminated with toxic substances. The simplicity of this removal mechanism provides reliable performance capable of meeting stringent removal requirements. However, membrane fouling is a major challenge that often limits their commercial viability. This research sought to investigate novel approaches to pretreatment and membrane modification to overcome fouling and high operating pressures. In addition, membrane separation processes can often be developed into simple yet educational experiments that are ideal for …
National Hero And Water Deity: The Worship Of Triệu Việt Vương In The Red River Delta, Vietnam, Huong Thi Nguyen
National Hero And Water Deity: The Worship Of Triệu Việt Vương In The Red River Delta, Vietnam, Huong Thi Nguyen
Graduate Theses and Dissertations
In my dissertation, the theory of collective memory will be deployed to address many questions regarding retaining, recovering, and re-creating the worship of King Triệu Việt Vương. He was a legendary, historical king of Vietnam who supposedly lived in the 6th century. His achievements were connected to the people living in the Red River Delta in their fight against the Liang invasion. The villagers who lived near or in this area also honored him for his spiritual power. They built a small temple/ shrine right by the riverbank to worship this King. The Vietnamese dynasties, Ly (in the 11th century), …
Effect Of Peracetic Acid Dip Frequency On The Quality And Functional Properties Of Non-Marinated And Marinated Broiler Tenderloins, Joaquin Jose Esquivel Vergara
Effect Of Peracetic Acid Dip Frequency On The Quality And Functional Properties Of Non-Marinated And Marinated Broiler Tenderloins, Joaquin Jose Esquivel Vergara
Graduate Theses and Dissertations
The poultry industry continues to balance the need for effective antimicrobial interventions with the preservation of meat quality. Among the most widely used antimicrobial agents, peracetic acid (PAA) has proven effective for reducing foodborne pathogens in poultry products. However, excessive or repeated exposure to PAA can influence meat functionality by altering protein structure, color, and water-holding capacity. Therefore, the broad objective of this study was to evaluate the effect of PAA dip frequency and post-treatment marination timing on the physicochemical and functional quality of broiler tenderloins (Pectoralis minor), in order to provide processing insights that optimize both microbial safety and …
Perception Of Drinking Water Quality Among Arkansas Residents, Kolade Olawale Olatunde
Perception Of Drinking Water Quality Among Arkansas Residents, Kolade Olawale Olatunde
Graduate Theses and Dissertations
Objective: Perceptions of drinking water quality influence public trust, water consumption behaviors, and the willingness to invest in infrastructure improvements. Despite the importance of safe drinking water, regional and socio-economic disparities impact how residents perceive their tap water and their readiness to pay for enhancements. While past research indicates that negative views of tap water quality have resulted in behavioral changes, the connection between perception and actual household water usage remains ambiguous. This study aims to investigate how perceptions of drinking water quality differ across regions in Arkansas and how residents are willing to invest in quality improvements. Method: A …
Characterizing Stellar Flares On Low-Mass Stars Tic 144217628 And Proxima Centauri Using Transiting Exoplanet Space Satellite (Tess) Optical Data, Charles Edward Holloway
Characterizing Stellar Flares On Low-Mass Stars Tic 144217628 And Proxima Centauri Using Transiting Exoplanet Space Satellite (Tess) Optical Data, Charles Edward Holloway
Graduate Theses and Dissertations
Low-mass stars account for more than 70% of stars within our galaxy. Their ob?servational interest can be attributed to their smaller radius and luminosity, making them ideal for detecting terrestrial planets inside their habitable zones. These magnetically active stars produce frequent stellar flaring events that can impact the atmospheric composition of nearby planets and interfere with the prebiotic processes for carbon-based life. Using TESS optical data, I have detected, measured astrophysical properties, and modeled the behavior of 44 flares from two low-mass stars: TIC 144217628 and Proxima Centuari. Given similar observational periods, Proxima Cen has shown to produce larger amplitudes …
Balancing Act: Examining The Relationship Between Organizational Culture And Burnout Within Graduate Medical Education Program Coordinators, Michael Conrad
Balancing Act: Examining The Relationship Between Organizational Culture And Burnout Within Graduate Medical Education Program Coordinators, Michael Conrad
Graduate Theses and Dissertations
This phenomenological study examined the lived experience of working as a graduate medical education (GME) program coordinator to determine how organizational culture impacts their burnout. The study was guided by the Job Demand-Resource Theory and the Conservation of Resources theory. When job demands outweigh job resources for an individual for a long period of time, it can result in burnout. Job resources can be used to buffer against demands and promote job growth, engagement, and learning. It is this concept which leads individuals to protect their resources when needed and to strive to develop new resources. Data was collected through …
Series Resonant Converters With Medium Voltage Sic Mosfets For Electric Aircraft Applications, Xinyuan Du
Series Resonant Converters With Medium Voltage Sic Mosfets For Electric Aircraft Applications, Xinyuan Du
Graduate Theses and Dissertations
To develop high-performance high- power-density MV power converters, the emerging silicon carbide (SiC) devices are more attractive than their silicon (Si) counterparts, since the fast switch frequency brought by the SiC can effectively reduce the volume and weight of the filter components and thus increase the converter power density. From the converter topology perspective, with the MV dc distribution, the single stage isolated dc/dc converter are suitable for next-generation electric aircraft system due to soft switching and high power density. In this work, comprehensive static and dynamic characterizations were conducted for the latest 6.5 kV silicon carbide (SiC) MOSFETs from …
A Thesis On Incentive Structures, Shirking Dynamics, And Market Valuation In Major League Baseball: A Statcast Analysis Of Worker Effort Levels, Charles Jordan
A Thesis On Incentive Structures, Shirking Dynamics, And Market Valuation In Major League Baseball: A Statcast Analysis Of Worker Effort Levels, Charles Jordan
Graduate Theses and Dissertations
This thesis examines how guaranteed contract length influences player effort and market valuation in Major League Baseball using high resolution Statcast data across over 1,200 player season observations. Fixed effects regressions on the 2015 to 2024 seasons show directionally consistent but statistically imprecise shirking and final year effort spikes in hard hit rate and sprint speed. Machine learning models (OLS and Random Forest) predict next year Dollars Over League Average (DOL) with out of sample MAE approximately $11.4–11.8 million and approximately 0.23–0.27, with plate appearances, hard hit rate, sprint speed, and contract timing as top predictors. Embedding these findings in …
Evaluating A Self-Guided Cognitive Behavioral Coping Skills Workbook For Sexual Violence-Exposed College Students Using A Nonconcurrent, Multiple Baseline Design, Marley F. Fradley
Evaluating A Self-Guided Cognitive Behavioral Coping Skills Workbook For Sexual Violence-Exposed College Students Using A Nonconcurrent, Multiple Baseline Design, Marley F. Fradley
Graduate Theses and Dissertations
College students endorse high rates of sexual violence victimization and posttraumatic stress disorder (PTSD). Help-seeking behaviors in college students are low and may be impacted by limited financial resources, competing obligations, treatment-related stigma, and features of PTSD such as avoidance, fear, and shame. Novel opportunities for sexually victimized college students to engage with trauma-focused interventions are necessary to mitigate the biopsychosocial consequences of PTSD. In a nonconcurrent, multiple baseline trial of a self-guided cognitive behavioral workbook for PTSD, sexual violence-exposed college students (N = 6) completed a 3-, 4-, or 5-week baseline period and then utilized the study workbook for …
A Phenomenological Exploration Of Black International Graduate Students’ Experiences In Building A Sense Of Belonging And Community At A Predominantly White Southern University, Hilda Solange George
A Phenomenological Exploration Of Black International Graduate Students’ Experiences In Building A Sense Of Belonging And Community At A Predominantly White Southern University, Hilda Solange George
Graduate Theses and Dissertations
Black international graduate students’ experiences navigating and developing a sense of belonging and community at higher educational institutions in the United States and particularly at predominantly white institutions have received minimal attention in scholarly inquiries, despite their cultural, intellectual, and financial contributions to host institutions and the country. To fill this gap in the existing literature, this hermeneutical phenomenological study aimed to gain a nuanced and in-depth understanding of Black international graduate students' perceptions of their sense of belonging and community at a predominantly white southern university (PWSU) in the United States. Guided by the research questions and the Black …
Discriminative And Generative Video Modeling, Anh Pha Nguyen
Discriminative And Generative Video Modeling, Anh Pha Nguyen
Graduate Theses and Dissertations
Video modeling stands at the core of modern computer vision, enabling progress in domains such as surveillance, autonomous driving, and instructional assistance. Yet the complexity of spatiotemporal dynamics, multimodal integration, and the need for scalable and generalizable models present significant challenges. This dissertation addresses these issues from three complementary perspectives: discriminative modeling, multimodal (vision + language) alignment, and generative approaches, contributing new methods, datasets, and paradigms for advancing video understanding. In the discriminative setting, we propose a domain-adaptive framework for crowd counting that employs entropy minimization and adversarial learning to improve cross-domain generalization, and introduce a single-stage global association method …
Implementation Of A Three-Port Solar Converter With A Battery Energy Storage System, Maison Christopher Phipps
Implementation Of A Three-Port Solar Converter With A Battery Energy Storage System, Maison Christopher Phipps
Graduate Theses and Dissertations
The increasing deployment of distributed solar and energy storage systems has created the need for integrated power converters that can efficiently manage photovoltaic (PV) generation, battery energy storage, and grid-tied AC output. This thesis presents the implementation and validation of a 5kW non-isolated Three-Port Converter (TPC) adapted for residential solar applications. The converter consolidates three power stage into a high-frequency, compact architecture: a unidirectional boost converter for PV input, a bidirectional interleaved buck-boost converter for battery energy storage, and a configurable DC/AC inverter for 120Vac single-phase output. The system is controlled using a central controller implemented on a TI C2000™ …
Programmable Network Approaches To Resilience And Security In Phasor Measurement Unit Networks, Zhiyao He
Programmable Network Approaches To Resilience And Security In Phasor Measurement Unit Networks, Zhiyao He
Graduate Theses and Dissertations
The security and resilience of smart grids are critical for ensuring reliable and stable power delivery. As modern power systems evolve to incorporate more advanced sensing and control capabilities, Phasor Measurement Units (PMUs) have become an important source of high-frequency, time-synchronized measurements that support wide-area monitoring, control, and protection. However, the growing complexity of smart grids and their reliance on real-time communication expose them to a range of cyber threats, including data loss, tampering, and coordinated attacks. This dissertation explores the use of programmable network technologies, particularly P4-based programmable switches, to provide in-network solutions that enhance the reliability and security …
Artificial Intelligence For Reliability: Predictive Health Maintenance And Geolocation In Gps-Denied Environments, Rafael Toche Pizano
Artificial Intelligence For Reliability: Predictive Health Maintenance And Geolocation In Gps-Denied Environments, Rafael Toche Pizano
Graduate Theses and Dissertations
In this dissertation, we explore the potential of machine learning and deep learning techniques to enhance the performance and robustness of applications across two major domains. By addressing the challenges within these fields, we demonstrate that we can leverage learning algorithms to obtain substantial improvements in accuracy and robustness. First, we tackle a problem in the field of predictive health maintenance. We propose a novel auto encoder and neural network based methodology to predict failure times in complex aviation systems to learn to distinguish between normal and abnormal operational behavior, and use this information to inform the neural network to …
Agricultural Practices’ Impact On Soil Health Indicators In Mid-South U.S. Crop Production Systems, Katherine Suzanne French
Agricultural Practices’ Impact On Soil Health Indicators In Mid-South U.S. Crop Production Systems, Katherine Suzanne French
Graduate Theses and Dissertations
Soil health and regenerative agriculture are concepts gaining popularity across global agriculture systems. The effect of sustainable farming practices such as nutrient management, cover crops, adoption of no-tillage, and residue retention on crop yield, as well as environmental resilience, is increasingly being studied. This research aimed to evaluate the impacts of (i) cover cropping and nutrient management, and of (ii) soil sampling depth and timing on indicators of soil health in various mid-southern irrigated row crop systems. Soil health indicators like soil organic matter (SOM), carbon dioxide respiration (CDR), beta-glucosidase enzyme activity (BG), permanganate oxidizable carbon (POXC), and the soil …
Design And Testing Of A Gallium Nitride Power Amplifier For High-Temperature Radar Applications, Walker Landry Harbison
Design And Testing Of A Gallium Nitride Power Amplifier For High-Temperature Radar Applications, Walker Landry Harbison
Graduate Theses and Dissertations
This thesis offers the design, fabrication, and evaluation of a gallium nitride (GaN) power amplifier integrated circuit (IC) intended for high-temperature radar applications. Radar systems are used in many different applications, such as defense, aerospace, and weather. For their function, these systems require high power, efficiency, and reliability under a wide range of operating conditions. Taking advantage of the material properties of GaN, including its high breakdown voltage, wide bandgap, and thermal conductivity bolstered by the use of silicon carbide in the substrate, this work focuses on examining amplifier performance in both ambient and elevated temperature conditions. The PA was …