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Verification Of Astm Centrifugation Equations For Soil Suction Determination, Esteban Maclein Miranda Pinzon
Verification Of Astm Centrifugation Equations For Soil Suction Determination, Esteban Maclein Miranda Pinzon
Graduate Theses and Dissertations
The unit correction constant (B) in the ASTM D6836 standard needs to be evaluated. The B-value was proposed to be 0.00548 instead of 0.00553. This apparent discrepancy led to an investigation comparing the predicted and measured suction values for high air entry (HAE) ceramic disks. A Beckman-Coulter Model J6-MI six-bay centrifuge and a WP4C Dewpoint Potentiameter were used in the testing program. HAE ceramic disks rated with bubbling pressures of 3-bar and 5-bar were used as analogue soil specimens. The HAE ceramic disks were spun in the small-scale centrifuge to apply prescribed suction amounts and then placed in the WP4C …
Estimation Of Gross Primary Productivity Of Rice In Arkansas Using The Vegetation Photosynthesis Model, Riasad Bin Mahbub
Estimation Of Gross Primary Productivity Of Rice In Arkansas Using The Vegetation Photosynthesis Model, Riasad Bin Mahbub
Graduate Theses and Dissertations
An estimate of the gross primary productivity (GPP) of rice fields can be instrumental to understand their harvest yield and to fulfill an array of agricultural monitoring needs. One of the most common satellite-based models to estimate GPP is the vegetation photosynthesis model (VPM). In this study, we use the VPM model for rice cropland in Arkansas and validate our findings against 16 site-years in-situ data (eddy covariance (EC)). At the site scale, results validated against 16 site-years have shown that the VPM with site information (R2 = 0.71, MAE = 2.90 g C m-2day- 1, and RMSE = 4.04 …
Raised Field Agriculture On The North Coast Of Peru: Environmental Investigations In The Casma Valley, Seth Price
Raised Field Agriculture On The North Coast Of Peru: Environmental Investigations In The Casma Valley, Seth Price
Graduate Theses and Dissertations
The Casma Valley, located on the central-northern coast of Peru, is home to a system of raised agricultural fields unique to the region. Relicts of pre-Hispanic culture, these fields are unusually well-preserved and primarily unaffected by modern agriculture. Multiscalar investigations of the Casma Valley raised fields revealed distinct anthropogenic soil alteration and landscape modification patterns. This dissertation assesses why Late Chimú (1300-1470 CE) societies in the Casma Valley converted ca. 2 km2 of land into raised agricultural field systems. This project is designed to investigate the composition and operation of raised fields, the short and long-term effects of field operation, …
Analyzing The Adoption, Cropping Rotation, And Impact Of Winter Cover Crops In The Mississippi Alluvial Plain (Map) Region Through Remote Sensing Technologies, Zobaer Ahmed
Graduate Theses and Dissertations
This dissertation explores the application of remote sensing technologies in conservation agriculture, specifically focusing on identifying and mapping winter cover crops and assessing voluntary cover crop adoption and cropping patterns in the Arkansas portion of the Mississippi Alluvial Plain (MAP). In the first chapter, a systematic review using the PRISMA methodology examines the last 30 years of thematic research, development, and trends in remote sensing applied to conservation agriculture from a global perspective. The review uncovers a growing interest in remote sensing-based research in conservation agriculture and emphasizes the necessity for further studies dedicated to conservation practices. Among the 68 …
The Effect Of Symbioses Between Mold Mites (Acaridae: Tyrophagus Putrescentiae) And Aspergillus Flavus On Their Respective Populations In Stored Maize., Paige Pionke Cummins
The Effect Of Symbioses Between Mold Mites (Acaridae: Tyrophagus Putrescentiae) And Aspergillus Flavus On Their Respective Populations In Stored Maize., Paige Pionke Cummins
Graduate Theses and Dissertations
Zea mays is the most commonly grown grain in the world and is used for animal feed, human consumption, and the creation of other products such as ethanol and bioplastics. Contamination of stored maize with stored grain invaders can lead to loss of revenue, reduced food availability, and potential health complications. Two such storage invaders; the mold mite Tyrophagus putrescentiae and the fungus Aspergillus flavus can work as symbionts within the grain storage system. To determine resulting population growth from this symbiosis, maize was inoculated with three treatments: A. flavus with no mites, T. putrescentiae with no fungus, and both …
Ways To Endure, Skyler J. Maggiore
Ways To Endure, Skyler J. Maggiore
Graduate Theses and Dissertations
Ways to Endure is an installation of photographic-based inquiry through light, steel, emulsion, glass and, healing welted skins. Topographic satellite imagery of flood-prone peaks and valleys within my rural home county are abstracted by a Google Earth glitch. Acupuncture needles are a reminder of sorrow and relief and an indicator of boundary and location. The Fresnel lens has a historical responsibility as a beacon, a tool of survival and navigation, originally used to concentrate and project light in lighthouses, and fire starters in survival kits. The Fresnels are fixed in front of intimate portraits to magnify and abstract. This installation …
Alkali Silica Reaction Mitigation Using Glycerin, Ana Laura Errigo Chanis
Alkali Silica Reaction Mitigation Using Glycerin, Ana Laura Errigo Chanis
Graduate Theses and Dissertations
The use of glycerin as a concrete additive to reduce alkali silica reaction (ASR), was evaluated and is presented in this study. Specifically, the United States Army Corps of Engineers (USACE) ultra-accelerated alkali silica reaction testing procedure by means of autoclaving was employed to examine the use of glycerin for ASR mitigation or reduction by analyzing mortar bar expansion data. The fine aggregates used in this investigation consisted of highly reactive Jobe Sand or Los Lunas Sand with an autoclave expansion of 0.5 and 0.4 percent, respectively. The laboratory investigation was performed by recording the amount of expansion of the …
Toxicity Of Different Insecticides To Sitophilus Oryzae, Tribolium Castaeneum And Tribolium Confusum Infesting Corn, Amina Twaibu
Toxicity Of Different Insecticides To Sitophilus Oryzae, Tribolium Castaeneum And Tribolium Confusum Infesting Corn, Amina Twaibu
Graduate Theses and Dissertations
Corn is an important cereal crop cultivated across various countries, including the United States. Corn serves multiple purposes such as human and livestock food and raw material for industrial processes. Despite being an important crop, corn production faces challenges due to factors such as weather fluctuations and the presence of insect pests and diseases, both in the field and during storage. Among these challenges, insect infestation poses a major threat, as the insect damage not only reduces the quantity and quality of the grain but also renders it unfit for human and animal consumption, leading to a decrease in market …
Generation Z’S Perceptions Of Hunting And Conservation Efforts In Arkansas, Hannah Ferguson
Generation Z’S Perceptions Of Hunting And Conservation Efforts In Arkansas, Hannah Ferguson
Graduate Theses and Dissertations
Hunting participation numbers have steadily declined since the 1980s and Generation Z is not engaging in hunting. Hunting is one of the most effective tools for managing wildlife populations and ensuring the success and local ecosystem conservation. Many wildlife stewardship institutions, such as Arkansas Game and Fish Commission in Arkansas, are funded by sales taxes imposed on firearms, ammo, and archery equipment. With a decline in hunting participation, it is imperative state-run wildlife stewardship organizations and other hunting institutions learn the best practices for communicating with younger generations. This study sought to understand Generation Z’s perceptions of hunting and conservation …
Modeling & Small Signal Analysis Of Grid Forming Inverter, Kadesh Hepburn
Modeling & Small Signal Analysis Of Grid Forming Inverter, Kadesh Hepburn
Graduate Theses and Dissertations
There is a rising number of inverter-based resources (IBRs) being integrated with distribution systems are becoming a more common occurrence. With integration of IBRs inverters, power utilities are experiencing an increase of number of operations with regards to voltage and frequency support. To maintain grid stability and reliability, IBRs need to provide some of the services currently (or formerly) provided by synchronous generators. Interconnection standards, like the IEEE 1547. 2018 has include requirements for IBRs to have the capability to provide some of these services—such as frequency and voltage support—and the procurement and deployment of the services can be implemented …
An Exploration Of Saudi Women’S Experiences And Perceptions Towards Participation In Physical Activity And Sports In The United States, Ahmed H. Sumayli
An Exploration Of Saudi Women’S Experiences And Perceptions Towards Participation In Physical Activity And Sports In The United States, Ahmed H. Sumayli
Graduate Theses and Dissertations
A significant proportion of Saudi women are currently living in different Western countries, including the United States of America. Physical activity and sports participation play a significant role in maintaining health and well-being for all individuals. Understanding their physical activity experiences and perceptions regarding participation in sports activity during their stay in the United States is important. This study aimed to understand if the length of residence in the United States and/or acculturation to the U.S. environment could significantly change Saudi women's patterns, attitudes, and behaviors towards sports and fitness activities. This qualitative study was carried out to explore and …
Constraining High Temperature Deformation And Metamorphism In The Southern Wet Mountains, Colorado, Usa: Implications For The Regional Extent Of The Picuris Orogeny, Sarah Morse
Graduate Theses and Dissertations
The Wet Mountains of Colorado are underlain by exhumed Proterozoic metamorphic rock that lies north of the recently identified 1.46 to 1.40 Ga Picuris orogen in northern New Mexico. The Picuris orogen is inferred to have formed in response to a Mesoproterozoic (ca. 1.49-1.40 Ga) contractional to transpressional event extrapolated to be regional in extent. It has been proposed that the Picuris orogen composes the westernmost tectonic segment of the Pinware-Baraboo-Picuris orogen that formed along an evolving convergent margin that becomes younger from northeast to southwest. This study is focused on the record of high temperature deformation, metamorphism, and plutonism …
Abolition’S Informal Gatekeepers: The Role Of County Courts In The Making Of Pennsylvania’S ‘Free’ Border, Amanda Mcgee
Abolition’S Informal Gatekeepers: The Role Of County Courts In The Making Of Pennsylvania’S ‘Free’ Border, Amanda Mcgee
Graduate Theses and Dissertations
Because Pennsylvania was the first state to implement legislation that slowly ended slavery within the state, contests over freedom and the enforcement of where it began and ended became an essential element of Pennsylvania’s border-making policies in the late eighteenth and early nineteenth century. The struggle over the territorial extent (by which I mean legal and geographical) of Pennsylvania abolition between enslavers intent on retaining their human chattel by any means necessary and enslaved men and women intent on asserting their freedom once they touched Pennsylvania “free soil” in turn, served to solidify the geopolitical boundary of the state in …
Enhancing Depression Screening And Treatment For Latinxs Residing In The U.S., Linda Esperanza Guzman
Enhancing Depression Screening And Treatment For Latinxs Residing In The U.S., Linda Esperanza Guzman
Graduate Theses and Dissertations
Introduction: In the U.S., Latinxs with Spanish as their preferred language encounter two prominent structural barriers impacting access to treatment for major depressive disorder (MDD). The first is that MDD symptoms commonly go undetected in Latinxs with Spanish compared to English as their preferred language. This might be perhaps because commonly used MDD screeners lack somatic symptom survey items culturally specific in how MDD may present among Latinxs with Spanish as their preferred language. The second structural barrier is that treatment access and completion rates are lower in Spanish-speaking than English-speaking Latinxs, perhaps due to treatments lacking the structure and …
Injectable Immunomodulatory Strategies To Enhance Muscle Recovery Following Injury, Tai Huu Huynh
Injectable Immunomodulatory Strategies To Enhance Muscle Recovery Following Injury, Tai Huu Huynh
Graduate Theses and Dissertations
Although skeletal muscle displays an astonishing regenerative capacity, injuries or diseases that resulted in bedridden or chronic muscle wasting can overwhelm this intrinsic feature of skeletal muscle and lead to functional deficit (range of motion and/or strength) and overall reduction in quality of life. Microenvironmental cues within injured skeletal muscle dictate regenerative and repair process which are tightly coordinated interplay among resident cells, cells recruitment and immune response following an assault in the muscle extracellular matrix (ECM). The successful regeneration of functional tissues requires both appropriate modulation of the inflammatory response, and activation of a variety of cell populations. Biomaterials …
Modeling The Egyptian Goose (Alopochen Aegyptiaca) Invasion; And Future Concerns, Percival Matzinger Marshall
Modeling The Egyptian Goose (Alopochen Aegyptiaca) Invasion; And Future Concerns, Percival Matzinger Marshall
Graduate Theses and Dissertations
In an increasingly interconnected world, the ecological and financial cost of invasive species is expected to continue to climb through the movement of exotic biota. Understanding the driving forces behind how a species invades, what environments promote their establishment, and what impacts they are likely to have on the invaded environment are all critical for management. Waterfowl, order Anseriformes, are one such category of invasive species of concern due to their popularity of accidental introduction, ease of movement, and propensity to affect both terrestrial and aquatic ecosystems. The Egyptian Goose (Alopochen aegyptiaca) is a native to the African continent that …
Evaluation Of Biochar Rate And Hemp Cultivar For The Phytoremediation Of Heavy-Metal-Contaminated Soil From The Tar Creek Superfund Site, Dietrich Thurston
Evaluation Of Biochar Rate And Hemp Cultivar For The Phytoremediation Of Heavy-Metal-Contaminated Soil From The Tar Creek Superfund Site, Dietrich Thurston
Graduate Theses and Dissertations
Soil contamination by cadmium (Cd), lead (Pb), and zinc (Zn) at the Tar Creek Superfund site in Northeast Oklahoma remains a threat to the environment and local ecosystem. Phytoremediation by industrial hemp (Cannabis sativa L.) and the use of biochar (BC) have been independently shown to be effective methods to remediate heavy-metal-contaminated soils. The objective of this greenhouse study was to evaluate the effects of industrial hemp cultivar (‘Carmagnola’ and ‘Jinma’), BC rate (0, 2, 5, and 10% by volume), soil contamination level (low, medium, and high), and their interactions on above- and belowground (AG and BG, respectively) plant dry …
Shedding In The Timber Rattlesnake: Natural Patterns, Endocrinological Underpinnings, Temporal And Energetic Effort, And Integration As A Reptilian Life History Trait, Maxwell D. Carnes-Mason
Shedding In The Timber Rattlesnake: Natural Patterns, Endocrinological Underpinnings, Temporal And Energetic Effort, And Integration As A Reptilian Life History Trait, Maxwell D. Carnes-Mason
Graduate Theses and Dissertations
The semi-frequent replacement of the epidermis (ecdysis) is a characteristic trait of reptiles. Whereas all reptiles regularly engage in some degree of skin shedding, skin morphology in snakes necessitates the synchronous replacement of the entire epidermis and facilitates the subsequent removal of the old layer as a single sheet. To date, the ubiquitous process has garnered little attention from researchers because snakes shed with unpredictable timing and frequency and are exceedingly cryptic during ecdytic cycles; previously impeding detailed physiological or ecological investigations of the process in the clade. Because of the lack of study, ecdysis is often viewed as a …
Juvenile Justice System Involvement And The Transition To Early Adulthood: Does Direct Intervention Help Or Harm?, Cameron Miller Perrine
Juvenile Justice System Involvement And The Transition To Early Adulthood: Does Direct Intervention Help Or Harm?, Cameron Miller Perrine
Graduate Theses and Dissertations
The present study examines the effects of the juvenile justice system on youth as they transition to early adulthood. The present study adds to the literature by incorporating comparison groups of youths and by testing multiple explanations of recidivism: Labeling Theory and the Life Course perspective. In total, 267 adults were recruited via online survey and sorted into three groups: Externalizing Behavior and Juvenile Justice Involved, Externalizing Behavior and Not Juvenile Justice Involved, and Not Externalizing and Not Juvenile Justice Involved. In addition to demographics, participants completed measures of past externalizing behaviors, past juvenile justice involvement, social disadvantage, deviant peer …
Components Of Emotional Functioning Among People With Substance Use And Posttraumatic Stress Difficulties: An Idiographic Perspective, Danielle Higuera
Components Of Emotional Functioning Among People With Substance Use And Posttraumatic Stress Difficulties: An Idiographic Perspective, Danielle Higuera
Graduate Theses and Dissertations
Prior research has examined components of emotional functioning (e.g., clarity, physiological sensations, expression, regulation) among people with substance use and/or posttraumatic stress at the group level; however, a more cohesive/comprehensive understanding of how these factors unfold and connect for individual people who comprise these populations is needed. The current study used a qualitative interview design to explore the emotional worlds of participants (N = 44) who comprised four groups (substance use [n ¬= 11], posttraumatic stress [n = 12], co-occurring substance use and posttraumatic stress [n = 11], and healthy controls [n = 10]) to gain a person-level understanding of …
Non-Energy Circular Economy Potential Of Rice Husks: A Techno-Eco-Environmental Assessment, Winfred Oppong Yeboah
Non-Energy Circular Economy Potential Of Rice Husks: A Techno-Eco-Environmental Assessment, Winfred Oppong Yeboah
Graduate Theses and Dissertations
The non-energy circular bioeconomy potential of rice husks was examined via sustainability assessments, namely life cycle assessment (LCA), life cycle impact cost assessment (LCICA), and techno-economic assessment (TEA). The study was conducted with three objectives. The first objective was to review previous studies on the non-energy utilization potential of rice husks by the method of meta-analysis. This review followed a systematic approach where research papers were collected following a defined set of criteria. The study revealed 16 key utilization pathways, all of which showed promising results. However, a comprehensive sustainability assessment was lacking in all of the pathways. The second …
A Comparative Study Of Techniques For Non-Monotonic Dependence With Emphasis On Sensitivity To Sample Size, Noise Level And Computational Attributes, Fariha Tasnim
Graduate Theses and Dissertations
Evaluating association between variables is often of interest by many researchers. To serve this purpose, different association measures have been developed. However, type of relation between variables affects the degree of relationship. Hence, detection of the rela- tionship between variables is germane to measuring the correlation coefficient. With that mindset, here we explored six non-monotonic measure of association techniques and com- pared them with three classical approaches. Due to inconsistency in definition and range of different techniques, it is not feasible to compare the correlation estimates as their nature of variability differ. Therefore, we used permutation test based on Monte …
Runoff Water Quality And Crop Growth As Affected By Wastewater-Derived Struvite, Machaela Morrison
Runoff Water Quality And Crop Growth As Affected By Wastewater-Derived Struvite, Machaela Morrison
Graduate Theses and Dissertations
Mined phosphate rock, used to produce phosphorus (P) fertilizers, is a finite resource. Struvite (MgNH4PO4 • 6H2O) that has been synthetically produced from a stock solution of known P and nitrogen (N) concentrations has been shown to be an effective, alternative fertilizer-P source for various crops. However, little is known about the runoff-water-quality implications from and the crop response to soil application of struvite created from an actual municipal wastewater source. This study consisted of two objectives: i) to evaluate the effects of soil [i.e., Creldon (Oxyaquic Fragiudalf), Dapue (Fluventic Hapludoll), Roxana (Typic Udifluvent), and Calloway (Aquic Fraglossudalf) series], fertilizer-P …
Securing Rice Safety Through Innovative Radiative Heat Treatment And Proper Storage, Faith Achieng Ouma
Securing Rice Safety Through Innovative Radiative Heat Treatment And Proper Storage, Faith Achieng Ouma
Graduate Theses and Dissertations
Securing the microbial safety of rice is a rising priority within the food industry, especially when used as an ingredient to manufacture ready-to-eat, minimally-processed products. Mold contamination is typically the most problematic for rice because certain species of Aspergillus produce toxic secondary metabolites known as aflatoxins, rendering the grain unfit for human and animal consumption. The objectives of this study are to: (1) investigate the effectiveness of using high-power (915 MHz frequency), short-duration microwaves (MWs) to inactivate microbes on rough rice; (2) use a three-level screening design to determine which storage factors, such as temperature, relative humidity (RH), storage duration, …
Commonalities In Evidence-Based Instructional Strategies For Autism Spectrum Disorder And English Language Learners, Kimberly Michelle O'Mara
Commonalities In Evidence-Based Instructional Strategies For Autism Spectrum Disorder And English Language Learners, Kimberly Michelle O'Mara
Graduate Theses and Dissertations
Many English language learners experience life on the Autism spectrum. These students will spend much of their day in the general education setting, and teachers will need effective and proven strategies to support them. The data show that Autism Spectrum Disorder is increasing among all populations (CDC, 2023). Current understandings and influences on these learners will be explored. This review examines evidence-based practices presented by premier sources in the fields of Autism Spectrum Disorder and English language learning, seeking commonalities in strategies. Using the findings from the National Standards Report and the National Clearinghouse for Autism Evidence & Practice cross-referenced …
Cultural Competence Among Child Life Professionals, Rachel Burger
Cultural Competence Among Child Life Professionals, Rachel Burger
Graduate Theses and Dissertations
There is an ever-growing need for individuals to work towards cultural competence, especially when those individuals work in healthcare. As healthcare professionals with backgrounds in child development and who provide emotional and psychological support to diverse pediatric patient populations in a variety of different sectors, child life specialists (CLS) and Certified Child Life Specialists (CCLSs) have an even greater need for understanding cultural competence (Thompson, 2009). The purpose of the current study was to examine the cultural competency levels of CCLSs, the type of cultural competence professional development units (PDUs) they participate in, and their perspectives on cultural competence in …
Etching Of Silicon Wafer In Preparation Of Graphene Transfer, Floyd T. Lancaster Iii
Etching Of Silicon Wafer In Preparation Of Graphene Transfer, Floyd T. Lancaster Iii
Graduate Theses and Dissertations
Following the research done on graphene looking at its unique properties it has been found that graphene can be used as a varying capacitor. What has been observed is that graphene acts almost like a torrential ocean constantly fluctuating. What we use is a silicon wafer with multiple etched layers to create a stable platform on which to capture this energy. In this paper we will discuss the general setup and step-by-step procedures required to create a functioning variable capacitor out of graphene, gold, and Silicon dioxide (SiO2) substrate. Electron Beam Lithography (EBL) is used to create the initial design …
Investigating And Characterizing Septin Cellular Regulators During Infection Related Development In M. Oryzae, Rinalda Proko
Investigating And Characterizing Septin Cellular Regulators During Infection Related Development In M. Oryzae, Rinalda Proko
Graduate Theses and Dissertations
The fungus Magnaporthe oryzae causes a devastating disease of rice and wheat, called blast, which poses a major threat to food security across the planet. To enter plant tissue, M. oryzae produces a remarkable pressure-generating infection cell called an appressorium, which mechanically ruptures the tough cuticle of host leaves through the application of enormous physical force directed onto a narrow penetration structure emerging from its base. Importantly, appressorium form and functionality depends on the regulated assembly of a toroidal ring-like structure, composed of septins, which forms within its base. Septins are a family of membrane-associated GTP-binding proteins that polymerize into …
Who Sings And Who Falls Silent? A Spatial And Social Analysis Of Virgilian Graffiti In Pompeii, Rachel Murray
Who Sings And Who Falls Silent? A Spatial And Social Analysis Of Virgilian Graffiti In Pompeii, Rachel Murray
Graduate Theses and Dissertations
This study analyzes Pompeian domestic spaces in which graffiti that quote the works of Virgil have been found. This is particularly compelling because of the Aeneid’s status as a ‘national epic,’ simultaneously ‘high’ culture and seemingly part of the ‘common’ imagination. In the past scholars have argued that the presence of Virgilian graffiti was not indicative of widespread interaction with Virgil, and that a select few individuals were responsible for these quotations. Drawing from ideas proposed by modern graffiti studies and spatial theorists and employing the methodology developed by the Virtual Pompeii Project, this study uses network analysis measures to …
Double-Sided Cooled Power Modules For Electric Vehicles, Riya Paul
Double-Sided Cooled Power Modules For Electric Vehicles, Riya Paul
Graduate Theses and Dissertations
Double-sided cooled (DSC) power modules in conjunction with Silicon Carbide (SiC) power devices are expected to significantly elevate the performance of the next-generation electric vehicle power inverters. The double-sided cooling enables maximum heat dissipation, resulting in higher power density. SiC power devices, with their fast-switching speeds, reduce the power losses for higher efficiency. A half-bridge power module consisting of 13 mΩ 1.2 kV SiC devices is used for this work. A baseline DSC power module was designed, fabricated, and tested. This unique design uses truncated rectangular copper connection blocks for better heat dissipation from the device top side compared to …