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Articles 553261 - 553290 of 5207130
Full-Text Articles in Entire DC Network
Biochar As A Lake Management Option For Harmful Algal Blooms: Lab Experiments And Bioassays, Brittany Mc Intyre
Biochar As A Lake Management Option For Harmful Algal Blooms: Lab Experiments And Bioassays, Brittany Mc Intyre
Graduate Theses and Dissertations
Harmful Algal Blooms (HABs) are an increasing global concern for water management due to their increased frequency, distribution, and toxin production. In freshwaters the growth of cyanobacteria (commonly known as blue-green algae), due to anthropogenic nutrient enrichment is the primary driver of HABS; these are often referred to as cyanoHABs. The management of cyanoHABs should be focused on in the watershed through best management and conservation practices or the physical, chemical and biomanipulation of the lake or reservoir that is experiencing these blooms. In this study, we examine the use of biochar as an option for the management or treatment …
Improving Tribological Properties Of Polydopamine/Polytetrafluoroethylene Coatings Through Incorporating Core-Shell Nanoparticles And Laser Surface Texturing, Firuze Soltani-Kordshuli
Improving Tribological Properties Of Polydopamine/Polytetrafluoroethylene Coatings Through Incorporating Core-Shell Nanoparticles And Laser Surface Texturing, Firuze Soltani-Kordshuli
Graduate Theses and Dissertations
Polytetrafluoroethylene (PTFE) is a widely used polymer that has unique properties such as chemical and temperature resistance, corrosion resistance, low maintenance cost, and a very low coefficient of friction (COF). These distinctive properties have made PTFE a promising candidate for industrial applications where surfaces are in relative motion. PTFE can be utilized as a thin film solid lubricant to significantly reduce the friction between moving surfaces. However, PTFE coatings have low cohesion and poor adhesion to the substrate resulting in its low wear resistance. This fact limits the application of PTFE coatings in load-bearing situations. To address these limitations, an …
On The Micro-Mechanical Property Characterization And Bulk-Volume Behavior Prediction Of Additively Manufactured 17-4 Ph Stainless Steels, David González-Niño
On The Micro-Mechanical Property Characterization And Bulk-Volume Behavior Prediction Of Additively Manufactured 17-4 Ph Stainless Steels, David González-Niño
Graduate Theses and Dissertations
Selective laser melting is an additive manufacturing technology that opens the possibility to manufacture components with complex geometries that are difficult with traditional manufacturing techniques which could benefit engineering applications such as aviation or structural engineering. However, the lack of a reliable universal predictive model for selective laser melting components could impede the full implementation in industrial applications. Therefore, this dissertation investigates the mechanical behavior of selective laser melting 17-4 PH stainless steel under ultra-low cycle fatigue regime and propose a novel micro-mechanical based modeling using statistical and representative volume element. The first phase of this project examined the mechanical …
Experimental Design For Determining The Cyclic Behavior Of Skewed Reduced Beam Section Moment Connections Having Composite Slabs, Paul Chabaud
Graduate Theses and Dissertations
This paper details the experimental design for determining the cyclic behavior of skewed Reduced Beam Section (RBS) moment connections having composite slabs. The effects of composite concrete slabs on skewed RBS connections subjected to cyclic seismic prequalification loading are addressed in this test setup. Full-scale double-sided RBS SMF specimens representing both interior and exterior column connections are designed and fabricated in this work. Experimental test fixturing and a lateral load application setup within the existing Grady E. Harvell Civil Engineering Research and Education Center (CEREC) are designed. All cyclic loading protocols required for the prequalification testing are described herein. Prequalification …
Development Of Self-Stressing Ultra High-Performance Concrete Using Expansive Chemical Admixtures, Lane Edwards
Development Of Self-Stressing Ultra High-Performance Concrete Using Expansive Chemical Admixtures, Lane Edwards
Graduate Theses and Dissertations
This study investigated the effects of expansive chemical admixtures on ultra-high performance concrete (UHPC) and self-stressing mechanisms. A literature review was performed to determine different types of expansive admixtures for feasibility of the self-prestressing concept. Ultimately it was decided that type-k cement, made by combining Komponent admixture with conventional UHPC, was the most suitable option due to its effects on wet and hardened concrete properties. Mix designs with varying amounts of Komponent were developed to test the effects the admixture had on various properties. Tested properties included, workability, compressive strength, expansion, short-term shrinkage, long-term shrinkage, and developed prestress. The development …
Personal Equation, Nicholas Hobbs
Personal Equation, Nicholas Hobbs
Graduate Theses and Dissertations
The body of this paper is a formatted version of text which exists natively on the web and is accessible at www.personalequation.art. Its non-linear narrative is meant to accompany and mirror, not describe, the artwork in the exhibition. The following two paragraphs are copied from the exhibition statement accompanying Personal Equation, which is on view in the Reading Room at the Fayetteville Public Library from April 3 to June 30, 2023: A personal equation is one that attempts to account for the inevitable role of subjectivity in scientific observations. The term was coined by astronomers in the 18th century who, …
Evaluation Of Hydrogeochemical Characteristics Of San Joaquin, Tulare, And Mojave Aquifers, Southern California, Maedeh Hassanvand
Evaluation Of Hydrogeochemical Characteristics Of San Joaquin, Tulare, And Mojave Aquifers, Southern California, Maedeh Hassanvand
Graduate Theses and Dissertations
Before making attempts to enhance and manage the quality of water, a thorough understanding of these processes is necessary since the chemical quality of groundwater is impacted by a number of linked processes. This would be more important in arid and semiarid regions like the southern part of California where more rely on groundwater for agriculture and drinking water uses than the other states. As a result, fundamental knowledge of the governing processes of groundwater chemistry is required for effective water resource management. Thus, this study is primarily concerned with three aspects in Mojave, Tulare, and San Joaquin aquifers: The …
From An Unlikely Place, Brittany Borcher
From An Unlikely Place, Brittany Borcher
Graduate Theses and Dissertations
From an Unlikely Place, a collection of eight ambitious paintings created while in residence at the University of Arkansas, examines the intersections of landscape painting, gendered gaze, feminine experience and the language of abstraction. One of the challenges I faced while working on this project was finding points of connection between verbal and visual language. As an artist, I consider where vulnerability, sensitivity and generosity intersect my work and am curious about the strange potential an individual's visual language; in my case, a concoction of abstract and figurative forms has to communicate the quality of experience. When placed together on …
On The Feasibility Of Embedding Fe-Sma Short-Fibers In Ultra-High-Performance Concrete For Self Prestressing, Gavin Briggs
On The Feasibility Of Embedding Fe-Sma Short-Fibers In Ultra-High-Performance Concrete For Self Prestressing, Gavin Briggs
Graduate Theses and Dissertations
Prestressing concrete is common practice in the construction industry. Current prestressing methods are often used for large, straight members and come with geometric limitations for curved or thin-walled members. Shape memory alloy short fibers embedded within concrete mixes may allow for the prestressing of geometries not possible with traditional methods. This study reviews past research on prestressing concrete with shape memory alloys, evaluates the achievable recovery stress within an Fe-SMA (when deformed at room temperature), and examines the mechanical behavior of Ductal dark grey UHPC when heated to 250 °C. The flexural behavior, compressive strength, and fiber-to-concrete bond strength of …
Portal, M'Shinda Abdullah Broaddus
Portal, M'Shinda Abdullah Broaddus
Graduate Theses and Dissertations
Portal is a series of large-scale multimedia collages that work to show the intersections between three very different and Tim-specific imagery. The imagery utilized, and the intersections highlighted aim to acknowledge a deep cultural history of how black men have been stripped of their personhood in visual media, and how that history has negatively impacted/impacts the way that black men are able to exist in reality.
Modeling And Control Strategies For A Two-Wheel Balancing Mobile Robot, John Alan Moritz
Modeling And Control Strategies For A Two-Wheel Balancing Mobile Robot, John Alan Moritz
Graduate Theses and Dissertations
The problem of balancing and autonomously navigating a two-wheel mobile robot is an increasingly active area of research, due to its potential applications in last-mile delivery, pedestrian transportation, warehouse automation, parts supply, agriculture, surveillance, and monitoring. This thesis investigates the design and control of a two-wheel balancing mobile robot using three different control strategies: Proportional Integral Derivative (PID) controllers, Sliding Mode Control, and Deep Q-Learning methodology. The mobile robot is modeled using a dynamic and kinematic model, and its motion is simulated in a custom MATLAB/Simulink environment. The first part of the thesis focuses on developing a dynamic and kinematic …
Failure To Appear, Trent Harlan Bozeman
Failure To Appear, Trent Harlan Bozeman
Graduate Theses and Dissertations
Failure To Appear is a series of photographs and collaged works that explores my layered connections between memory, unknown legacies, and knowledge of self. This body of work is not tied to any location or specific event. It is attributed to my returning to the South, returning to the institution, returning to my childhood residence and the perceived agnosia that occurred while working on a long-term project based in the Arkansas Delta.
Bond-Breaker Properties Of Different Media For Concrete Pavement Design, Andres Calzacorta
Bond-Breaker Properties Of Different Media For Concrete Pavement Design, Andres Calzacorta
Graduate Theses and Dissertations
Currently Arkansas requires a layer of asphalt as the main bond-breaker over cement treated base for rigid pavement design. The study presented in this paper aims to replicate the results from previous research which demonstrated the bond-breaker properties of concrete curing compounds and geotextiles. Bond-breakers are materials applied to the surface of stabilized bases to reduce the interaction between the base and a pavement cement concrete layer. The excessive interaction between these two layers can lead to cracking in the overlay and reduction of the serviceability life of concrete. The curing compound was applied in a single application (SA, 200 …
Pda/Ptfe Solid Lubricant Coating For 60niti Applications, Charles Richey Miller
Pda/Ptfe Solid Lubricant Coating For 60niti Applications, Charles Richey Miller
Graduate Theses and Dissertations
The intermetallic alloy 60NiTi has a unique combination of high hardness and low elastic modulus, which makes it highly resistant to dents. Additionally, 60NiTi is extremely corrosion resistant and chemically inert. These properties make 60NiTi a desirable material for challenging mechanical component applications with high contact stresses and in harsh environments. However, lubrication issues have hindered the use of 60NiTi because it has poor tribological performance if it is not properly lubricated. The mechanical properties of hardened 60NiTi and its microconstituents were studied by nanoindentation. This study showed that the bulk properties of 60NiTi are driven by the properties of …
Evaluation Of Rice Stink Bug, Oebalus Pugnax (F.), Resistance To Lambda-Cyhalothrin And The Economic Impact On Rice Grain Quality For Multiple Foliar Insecticides, Trevor Bradley Newkirk
Evaluation Of Rice Stink Bug, Oebalus Pugnax (F.), Resistance To Lambda-Cyhalothrin And The Economic Impact On Rice Grain Quality For Multiple Foliar Insecticides, Trevor Bradley Newkirk
Graduate Theses and Dissertations
Rice stink bug, (RSB), Oebalus pugnax (F.), (Fabricius 1775) is the major pest of headed rice, Oryza sativa L. in the southern rice producing states. The evaluation of current insecticides is imperative to efficient and economical RSB management for rice growers. Multiple reports of field failures with lambda-cyhalothrin have been documented since 2019. Lambda-cyhalothrin has been the standard for RSB control for the past two decades. The objective for this research was to determine if RSB is becoming resistant to lambda-cyhalothrin in Arkansas, and the most economical insecticide choice for growers with respect to RSB control and grain quality. RSB …
Evaluation Of Thresholds, Control, And Behavioral Responses Of Tobacco Thrips, Frankliniella Fusca (Hitch), And Tarnished Plant Bugs, Lygus Lineolaris (Beauvoris), In Thryvon Cotton, Adam Young Whitfield
Evaluation Of Thresholds, Control, And Behavioral Responses Of Tobacco Thrips, Frankliniella Fusca (Hitch), And Tarnished Plant Bugs, Lygus Lineolaris (Beauvoris), In Thryvon Cotton, Adam Young Whitfield
Graduate Theses and Dissertations
Tobacco thrips are an important pest in Mid-South cotton production. Thrips are a pest of seedling cotton, feeding on the leaf tissue of plants which can result in stunted growth, delayed fruiting, loss of apical dominance, and possible stand loss. Field studies were conducted in 2021 and 2022 to evaluate Thryvon, a new transgenic trait in cotton that produces the Bt toxin Cry51Aa, for control of tobacco thrips. Thryvon cotton was tested at three locations in Arkansas: Marianna, Tillar, and Keiser. These studies evaluated thrips control on ThryvOn vs non-ThryvOn cotton and the effect of insecticide seed treatments on ThryvOn …
Geophysical Assessment Of Internal Erosion Damage At The Crawford County Levee, Samuel Ross Hokett
Geophysical Assessment Of Internal Erosion Damage At The Crawford County Levee, Samuel Ross Hokett
Graduate Theses and Dissertations
Levee failures during flooding events can result in catastrophic loss of life and property. Soil erosion during high water events is a primary cause of levee failures. Accordingly, this research focuses on the geophysical assessment of internal erosion damage in levees. This thesis presents a case study utilizing Capacitively Coupled Resistivity (CCR), Direct Current Electrical Resistivity Tomography (DC ERT), and Multichannel Analysis of Surface Waves (MASW) to assess internal erosion damage at the Crawford County Levee System in Van Buren, AR, that occurred during the 2019 Arkansas River flood. Geophysical surveys acquired included longitudinal CCR, DC ERT, and MASW lines …
Evaluation Of Bt Cotton Cultivar Efficacy And Economic Impact On Cotton Yield With And Without A Foliar Insecticide Application, Zackary Murray
Evaluation Of Bt Cotton Cultivar Efficacy And Economic Impact On Cotton Yield With And Without A Foliar Insecticide Application, Zackary Murray
Graduate Theses and Dissertations
Helicoverpa zea is the second most damaging insect pest of cotton in Arkansas. It is becoming more difficult to control in the United States due to recently documented resistant to dual gene cultivars. The objective of this thesis was to develop a better understanding of the efficacy of several Bt cotton technologies and foliar insecticides used to manage H. zea. Experiments examined damage in current commercial non-Bt, dual gene, and three gene cotton cultivars. Other experiments evaluated if H. zea could detect concentrations of chlorantraniliprole and residual of chlorantraniliprole in cotton for an extended period after application. These studies suggest …
Editor's Note, Will Anderson
Market (Man), Natalia Toreeva
Prehistoric Mythology, Tania Blanco
Pink Roses, Karlynn Rich
Fall In Love With An Over-Thinker, Fisayomi Oloyede
Fall In Love With An Over-Thinker, Fisayomi Oloyede
The Prairie Light Review
No abstract provided.
My Mother's Hands, Tom Montgomery Fate
Off The Coast Of Eden, Elena Byrd
Etre Le Coup De Foudre, Bee Bishop
The Dawn Of Light, Chris Hurley
Because I Don't Know How To Say, Jessica Shubert
Because I Don't Know How To Say, Jessica Shubert
The Prairie Light Review
No abstract provided.
Sudden Stop, Janine Orihuela Solis
Both Sides, Damien Mendez