Digital Commons Network^™

Arkansas Water Resources Center Annual Technical Report, 2017, Arkansas Water Resources Center

Arkansas Water Resources Center Annual Report

No abstract provided.

Monodisperse Core/Shell And Other Complex Structured Nanocrystals And Methods Of Preparing The Same, Xiaogang Peng, Jianqing Li, David Battaglia, Y. Andrew Wang, Yunjun Wang

Patents Granted

The present invention provides new compositions containing nearly monodisperse colloidal core/shell semiconductor nanocrystals with high photoluminescence quantum yields (PL QY), as well as other complex structured semiconductor nanocrystals. This invention also provides new synthetic methods for preparing these nanocrystals, and new devices comprising these compositions. In addition to core/shell semiconductor nanocrystals, this patent application also provides complex semiconductor nanostructures, quantum shells, quantum wells, doped nanocrystals, and other multiple-shelled semiconductor nanocrystals.

Methods And Compositions For X-Ray Induced Release From Ph Sensitive Liposomes, Daniel Fologea, Ralph Henry, Greg J. Salamo, Yuriy Mazur, Michael J. Borrelli

Patents Granted

Compositions including pH sensitive lipid vesicles comprised of a lipid layer, an agent, and an organic halogen such that the agent is released from the vesicles after exposure to ionizing radiation. Methods of delivering the agent to a target in a subject using the compositions provided herein are also described. The methods allow for controlled release of the agent. The timing of release of the agent from the lipid vesicle may be controlled as well as the location of release by timing and localizing the exposure to ionizing radiation exposure.

Minutes Staff Senate Meeting, December 14, 2017, University Of Arkansas, Fayetteville. Staff Senate

Staff Senate Meeting Minutes

No abstract provided.

Student Affairs Bi-Weekly Newsletter, December 5, 2017, University Of Arkansas, Fayetteville. Division Of Student Affairs

Student Affairs Bi-Weekly Newsletter

No abstract provided.

Mole Street Journal, December 2017, University Of Arkansas, Fayetteville. Dept. Of Chemistry And Biochemistry

Mole Street Journal

No abstract provided.

Animal Science E-Newsletter, December 2017, University Of Arkansas, Fayetteville. Department Of Animal Sciences

Animal Science e-Newsletter

No abstract provided.

Assessing The Current Efficiencies Of Farm Credit Of Western Arkansas, Hailey Paulsen

Agricultural Economics and Agribusiness Undergraduate Honors Theses

Farm Credit is a unique banking structure, as it is a cooperative which pays patronage dividends to its members. As such, the rates for loans (nominal interest rates) that Farm Credit offers can be slightly higher than larger commercial banks because the patronage payment can offset some, all or more of interest rate difference, which results in an effective rate. Farm Credit, like other globally evolving industries, must continuously look for ways to differentiate themselves to compete for new customers and retain existing ones. Thus, this study sets out to survey the members of Western Farm Credit of Arkansas to …

Profitability Analysis Of Varying Herd Sizes Based On Price Signals In Cow-Calf Operations, Colson Tester

Agricultural Economics and Agribusiness Undergraduate Honors Theses

The third most consumed meat around the world is beef. Despite global growth in demand, cattle markets experience price cycles related to biological production lags causing variability in cash flow and profitability for producers. Price-driven herd size management strategies thus have received attention. This study adds to that literature by analyzing both price and production risk using three herd size management strategies: i) steady state – holding herd size constant; ii) dollar cost averaging – keeping reinvestment constant by varying the number of replacement heifers retained at a constant long run average dollar total; and iii) moving average – using …

Mppt Control For Solar Splash Photovoltaic Array, Kelsey Zenko

Mechanical Engineering Undergraduate Honors Theses

This thesis demonstrates the ability to model and simulate the operation of Maximum Power Point Tracking, MPPT. Moreover, the MPPT technology is contextualized within the confines of the Solar Splash competition to provide the foundation for future model development and simulation for optimal competition performance. MatLab Simulink was used to model the solar panel's operation. A MPPT algorithm was written using the perturb and observe method and was implemented in the model using a buck DC to DC converter. The performance of the model with hardware in the loop using Typhoon and dSPACE, which demonstrated how the actual hardware would …

Are All Fraternity Men The Same? Differences In Privilege And Perceptions Of Women And Rape, Kathryn Rogers

Human Development and Family Sciences Undergraduate Honors Theses

The current study examined the presence of privilege in fraternity men on a college campus to assess their differences in privilege and how that affects their perceptions of women and rape. The current study focused on men (n = 179) who claimed to be a current member of a social fraternity (n = 69) and assessed whether they were privileged or not based off of their parental household income. While there was a strong presence of privilege among fraternity men, they showed no differences in their perceptions of women and rape. However, they were more likely to have …

Using Historic Pavement Performance Data To Identify And Select Sites For Asphalt Mixture Design Studies, Allyson Richey

Civil Engineering Undergraduate Honors Theses

Since 1997 Arkansas asphalt mixtures have been designed using a procedure commonly known as ‘Superpave’. In a traditional Superpave mix design, the design considers only traditional volumetric parameters; however, recent advances in mix design technology emphasize mixture’s ability to perform in its environment. There are numerous factors which affect the performance characteristics of an asphalt mix. Certainly, the asphalt binder’s performance is a critical variable in this system. Asphalt binders are sensitive to temperature, so much so that their primary parameter on which they are recommended is a function of both temperature and the geographic latitude in which the pavement …

Avian Advice, December 2017, Dale Bumpers College Of Agricultural, Food, And Life Sciences (University Of Arkansas, Fayetteville). Center Of Excellence For Poultry Science, University Of Arkansas (System). Cooperative Extension Service

Avian Advice

No abstract provided.

Effects Of Uniaxial Cyclic Strain On Endothelial Progenitor Cells, Maria Alejandra Zeballos Castro

Biomedical Engineering Undergraduate Honors Theses

Despite the high prevalence of calcific aortic valve disease (CAVD), the underlying mechanisms of pathogenesis have not been found yet. Therefore, it is extremely important to study CAVD and understand how it develops. For this matter, we decided to study the potential of endothelial progenitor cells (EPCs) for use in tissue-engineered models of heart valves. EPCs were chosen as the cell source of interest for this study due to their high neovascularization potential and use in regenerative medicine and cardiovascular tissue engineering.

In this project, we aimed to engineer the microenvironment of cells that are involved in the formation of …

The Effect Of Pet Ownership On Esl Students’ U.S. Academic Success, Emily Benjumea

Animal Science Undergraduate Honors Theses

This study examines the academic success of English as a second language (ESL) students based on ownership of and/or relationship with a pet, due to pets’ ability to benefit and support their owners. A survey was compiled for middle school, ESL students in the Fayetteville, Arkansas school district. The goal of the study was to discover if pet ownership has an effect on ESL student academic success in terms of the academic, social, and emotional aspects of school. It was found that pets aid in some academic aspects of school but more so in the social and emotional aspects such …

Evaluation Of Insecticide Seed Treatments To Protect Rice (Oryza Sativa) Against Various Herbicides, Steven Michael Martin

Graduate Theses and Dissertations

The increase in herbicide-resistant weeds in Arkansas crop fields has led to the need for new herbicide modes of action for use in all crops. This need has led to the introduction of technologies that can be devastating to conventional rice crops. Field observation, noted that insecticide seed treatments used in rice could potentially reduce the effects of off-target movement of herbicides onto rice crops and possibly reduce the negative effects of some herbicides applied directly to rice. Research was conducted to determine if insecticide seed treatments could reduce the harmful effects of drift from imazethapyr and glyphosate onto conventional …

Motivating Teachers To Lead In Low-Performing Schools: A Qualitative Study Of School Leaders In Three Arkansas High Schools, Joseph D. Fisher

Graduate Theses and Dissertations

This qualitative research study addressed the problem of motivating teachers to take on leadership roles in “low-performing” schools. Coupled with the high demands of the Every Student Succeeds Act (ESSA) being placed on public school principals to ensure that all students achieve and successfully graduate high school, better ways to distribute leadership and share responsibilities among teachers were identified. The research question and purpose of this phenomenological study was to identify the perceived leadership behaviors of high school principals in once labeled “low-performing” schools that support the motivation of teachers to take on leadership roles. Nine identified teacher leaders and …

The Diffusion Of Veterans Treatment Courts: An Examination Of Political, Social, And Economic Determinants At The County Level, Eric D. Button

Graduate Theses and Dissertations

In 2008, leading U.S. counties adopted innovative treatment courts specializing in the unique needs of veterans with substance abuse and other legal issues. Since then, pro-veteran advocacy has aided in the continued diffusion of additional veterans treatment courts (VTCs), with more than 300 county and state-level VTCs currently operating in 46 states across the country. Though the lens through which veterans are viewed may be positive in the public eye, institutional support for these wayward veterans appears to vary across levels of government; therefore, while some posit the increased social utility of budget-friendly VTCs, others suggest that VTCs offer favorable …

The Potential For Phosphorus Release From Floodplain Soils: Temporal Variability And Management Strategies, Megan Amanda Reavis

Graduate Theses and Dissertations

Soils may contain large amounts of legacy phosphorus (P) due to past application of excess fertilizers, releasing P during runoff and flood events. As the level of P in soils increases, the release of P from the soils increases, but the temporal fluctuations of this release are not well known. Experiments were conducted to examine 1) the variability of soluble reactive P (SRP) release from the soil throughout a year and 2) the effect of repeated flooding and drying cycles on release rates. Soil cores were collected 7 times throughout a year from 2 sites within the Watershed Research and …

A Geochemical Investigation And Comparison Between Organic-Rich Black Shales And Mississippi Valley-Type Pb-Zn Ores In The Southern Ozarks Region, Bryan Michael Bottoms

Graduate Theses and Dissertations

Mississippi Valley-type (MVT) deposits are base metal sulfide deposits that are important economic sources of both Pb and Zn, accounting for 24% of the global Pb and Zn reserves. They are found all over the world, often hosted in platform carbonates on the flanks of sedimentary basins, and often in proximity to hydrocarbons. They are epigenetic, not related to igneous activity, and thought to be sourced from low temperature, highly saline basinal brines that are expelled from sedimentary basins during compaction and/or in conjunction with an orogenic event. The basinal lithologies responsible for providing the metals for the ores are …

Economic Contribution Of The Agricultural Sector To The Arkansas Economy In 2015, Leah English, Jennie Popp, Wayne Miller

Research Reports and Research Bulletins

Agriculture and associated agricultural activities are major contributors to the Arkansas economy. Agriculture is defined as the sum of agricultural production and processing activities, unless otherwise specified, and includes crop and animal production and processing, agricultural support industries, forestry and forest products, and textile goods. Agriculture contributes to the economy through direct agricultural production and value-added processing, and also leads to economic activity in other parts of the economy. This report is the tenth in a series of reports examining agriculture’s economic contribution to the Arkansas economy. The total economic contribution of agriculture (direct, indirect, and induced effects) on value …

Measurement Of Peptoid Concentration Using Uv Spectroscopy, Katie Holland

Chemical Engineering Undergraduate Honors Theses

The goal of this research is to establish a relationship between ultraviolet adsorption and peptiod concentration to be used to determine the concentration of an unknown peptoid sample. This will allow for the measurement of concentration differences of peptoid samples before and after incubation with membrane surfaces. Samples were prepared nine know concentrations and diluted 50 fold. The UV absorbances of each sample was measured using a UV spectrophotometer at wavelengths from 200 to 450 nanometers. This process was repeated, and the maximum absorbance of each replicate was averaged to yield an absorbance value for each concentration of peptoid. …

A Risk-Based Method For Estimating The Carbon Sequestration Budget For A Mixed Hardwood Forest, Erin Cooper

Chemical Engineering Undergraduate Honors Theses

Carbon Dioxide (CO₂) levels in the atmosphere have risen from approximately 310 ppm in the 1950’s to over 400 ppm as of 2015. This rise in CO₂ has likely resulted in the observed warming trend of the earth’s atmosphere in the same time frame, causing significant concern in the scientific community. Several mitigation strategies have arisen to combat the upward trend of CO₂ emissions in recent decades, among them being carbon sequestration- the process of capturing CO₂ from the atmosphere and holding it for an extended period of time. This study used the U.S. Forest …

Coupling K-12 Music Education With Science, Technology, Engineering And Math (Stem) Curricula: Implementation Of A Stemusic Outreach Program, Mallory Maestri

Civil Engineering Undergraduate Honors Theses

Many studies have investigated the effects of music on evoking human emotions and diverse types of brain responses. One study by Juslin and Vastfjall indicates that hearing music can stimulate brain stem reflexes, create emotional contagion, recall episodic memories and provoke visual imagery. Due to the influence music has on human brain waves, researchers have been studying the effect of music on enhancing the spatial abilities of young students. Science, Technology, Engineering and Math (STEM) professions rely heavily on spatial skills. Research on the connection of music with spatial skills proposes that when the brain processes rhythm a “mental rotation” …

The Relationship Between Bmi & Mandated Physical Education Requirements Of Elementary Schools, Kathryn Fairlamb

The Eleanor Mann School of Nursing Undergraduate Honors Theses

The physical activity policies of elementary schools in Arkansas and correlations between physical activity requirements and body mass index have been studied. Examination of the policies at the individual school, district, or state level were noted. The statewide BMI database was consulted. Interviews with physical education teachers was conducted to assess policy implementation. Results may provide schools and policy makers with insight on future physical activity policies.

Influence Of Social And Economic Factors On Elementary Student Health In Northwest Arkansas, Megan Marks

The Eleanor Mann School of Nursing Undergraduate Honors Theses

A child’s wellbeing is influenced by many factors related to the environment they are raised in. The purpose of this study was to investigate the relationship between a child’s social and economic factors and his or her health. A convenience sample of 588 2nd and 4th grade children was taken from three elementary schools in Springdale Independent School District. Health status was represented by calculations of each child’s body mass index (BMI) and number of days counted absent from school. Socioeconomic and demographic factors examined include the child’s grade level, gender, ethnicity, number of parents over the household, number of …

The Effect Of Interaction With Therapy Horses On University Students' Perceived Stress Level, Alexa Chapman

The Eleanor Mann School of Nursing Undergraduate Honors Theses

This research project investigates how university students are affected by interacting with therapy horses. Stress is the factor that will be evaluated in this particular study. The self-rated stress scores will be acquired from University of Arkansas students both before and after interacting with specially trained therapy horses during an Equine Assisted Activity and Therapy (EAAT) class offered at the University. Stress will be evaluated by students taking a survey inquiring about daily stressors including finances, school, work and relationships. The data collected will be compared by pre- and post- interactions with the horses. We expect that the pre- and …

Effect Of Physical Fatigue On The King-Devick Concussion Assessment, Audrey Bauer

Health, Human Performance and Recreation Undergraduate Honors Theses

The Abstract for this thesis is not available at this time.

Modifiable Factors Impeding Nurses’ Willingness To Report In A Disaster, Kate Hutchison

The Eleanor Mann School of Nursing Undergraduate Honors Theses

This research project investigates what modifiable factors impede nurses’ willingness to report to work during a disaster. The survey sample were nurses in the United States. Survey methodology was a snowball sampling initiated among nurses attending a PhD Program at the University of Texas at Tyler as well as the utilization of Facebook to recruit participants. The survey instrument determined likelihood of nurses reporting to work in various types of disasters and factors that may impede them from responding to such disasters. The online survey asked thirty-five “select all that apply” type questions and the results will be used to …

The Influence Of Walking Speed On Hip Muscle Activity And Lumbopelvic Movement, Kate Tarver

Health, Human Performance and Recreation Undergraduate Honors Theses

Prolonged standing induces low back pain (LBP) in at least 50% of study participants. It is hypothesized that people who develop LBP during standing have high gluteus medius co-activation; however, there is no research on how interventions, such as intermittent walking breaks, influence co-contraction. PURPOSE: Examine the effects of different walking speeds on gluteus medius co-contraction. METHODS: Four males and three females (mean age=22.5) have participated in this study. The exclusion criterion includes any previous low back or hip injury, surgery and an allergy to rubbing alcohol. Electromyography (EMG) of bilateral gluteus medius were recorded during a baseline standing trial …