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Articles 800611 - 800640 of 5160103
Full-Text Articles in Entire DC Network
Shipboard Lidar As A Tool For Remotely Measuring The Distribution And Bulk Characteristics Of Marine Particles, Brian Leigh Collister
Shipboard Lidar As A Tool For Remotely Measuring The Distribution And Bulk Characteristics Of Marine Particles, Brian Leigh Collister
OES Theses and Dissertations
Light detection and ranging (lidar) can provide remote estimates of the vertical distribution of optical properties in the ocean, potentially revolutionizing our ability to characterize the spatial structure of upper ocean ecosystems. However, challenges associated with quantifying the relationship between lidar measurements and biogeochemical properties of interest have prevented its adoption for routinely mapping the vertical structure of marine ecosystems. To address this, we developed a shipboard oceanographic lidar that measures attenuation (α) and linear depolarization (δ) at scales identical to those of in-water optical and biogeochemical measurements. The instrument’s ability to resolve the distribution of optical and biogeochemical properties …
Sleeping With The Enemy: Examining The Relationship Between Sleep And Pain In Post-9/11 Veterans, John L. Schwartz Jr.
Sleeping With The Enemy: Examining The Relationship Between Sleep And Pain In Post-9/11 Veterans, John L. Schwartz Jr.
Psychology Theses & Dissertations
United States veterans are a diverse group of individuals, yet as a result of their service, they share a unique set of customs, traditions, and values. Post-9/11 veterans are more likely to experience elevated levels of pain and poor sleep quality compared to their civilian counterparts; however, little is known about how beliefs related to veterans’ pain impact their sleep and how levels of pain acceptance influence the sleep-pain association. This study examined relationships between sleep and pain in a sample of 102 post-9/11 veterans. Results support associations between pain and sleep identified in other populations. Positive correlations were found …
Estimating The Risk Of Future Plastic Marine Debris Resulting From The Urban Coastal Built Environment, Kelly C. Jones
Estimating The Risk Of Future Plastic Marine Debris Resulting From The Urban Coastal Built Environment, Kelly C. Jones
OES Theses and Dissertations
The growing urban built environment in the coastal zone poses an unknown risk to the marine biosphere as a source of marine debris. Plastic, since its introduction in the mid- 1900s, is now used in nearly all aspects of human life. Growth in human population and urbanization in coastal zones has resulted in the accumulation of large stocks of plastic in the coastal built environment, and these stocks are still growing exponentially. The coastal zone is exposed to a number of hazards including storms, tsunamis, and sea level rise, and most of these hazards are expected to change in the …
The Impact Of Muscular Strength On Cardiovascular Disease Risk Factors, Joel Ernest Harden
The Impact Of Muscular Strength On Cardiovascular Disease Risk Factors, Joel Ernest Harden
Human Movement Studies & Special Education Theses & Dissertations
The purpose of this study was to determine the associations between isokinetic leg muscular strength and cardiovascular disease (CVD) risk factor characterizations in Americans aged 50 and older. Using a publicly available dataset from the National Health and Nutrition Examination Survey (NHANES), a secondary analysis was conducted on participants (males ≥50 yrs; females ≥55 yrs; N=10,858) pooled from 1999 to 2002. CVD risk factors were determined using the American College of Sports Medicine (ACSM) cutoff values, with all nine ACSM risk factors analyzed. CVD risk factor characterization was determined by creating CVD risk factor profiles (i.e., the total number of …
The Spooky Vein: The Reparative Gothic-Modern In The Works Of Richard A.W. Hughes, Corwin R. Baden
The Spooky Vein: The Reparative Gothic-Modern In The Works Of Richard A.W. Hughes, Corwin R. Baden
English Theses & Dissertations
This dissertation explores the dual nature of Richard A.W. Hughes as a marginalized Gothicist and modernist. This duality facilitated the development of the author’s reparative vision for a 20th-century world traumatized by planetary war. The present study utilizes close readings—both surface and symptomatic—combined with archival research to assert that Hughes fashions this reparative imperative consistently across his corpus: in his short stories, poems, novels, stage plays, and screenplays. In his short stories, this vision includes an embrace of the Stranger, a shadowy Gothic figure whose possessions, power, difference, and familiarity lead the human subject from contestation, through representation, and toward …
Making It To The Next Grade: How Elementary School Principals Make Sense Of Grade Retention Policies For English Learners, Lynmara Colón
Making It To The Next Grade: How Elementary School Principals Make Sense Of Grade Retention Policies For English Learners, Lynmara Colón
Educational Leadership & Workforce Development Theses & Dissertations
Critical approaches to policy suggest that policy, even in the most apparently democratic polity or institution, codifies and extends the interests of those who disproportionately wield power (Levinson et al., 2009). While many people are involved in conversations and decisionmaking processes related to the implementation of grade retention or promotion policies, the final decision is made at the school level. Critics of grade retention, meanwhile, also warn that retained students may be harmed by stigmatization, reduced expectations for their academic performance on the part of teachers and parents, and the challenges of adjusting to a new peer group (Schwerdt et …
Intention-Behavior Discrepancies For Alcohol Consumption Among College Students, Emily Kaye Junkin
Intention-Behavior Discrepancies For Alcohol Consumption Among College Students, Emily Kaye Junkin
Psychology Theses & Dissertations
Unplanned drinkers may experience elevated risk for drinking-related harm. Research examining unplanned drinking focuses on the unplanned nature of a drinking episode (i.e., did the student drink when no drinking was planned), yet this does not capture the importance of the unintended quantity consumed. For instance, a discrepancy between drinking intentions and actual consumption has the potential to differentially impact alcohol-related outcomes beyond what is accounted for by unplanned drinking episodes. Further, research has not investigated how college students’ unintended drinking is associated with alcohol-related consequences. Moreover, utilization of protective behavioral strategies (PBS) has been shown to decrease negative outcomes …
Towards Characterizing Adversarial Opportunity And Behavior In Critical Infrastructure Network, Md Sharif Ullah
Towards Characterizing Adversarial Opportunity And Behavior In Critical Infrastructure Network, Md Sharif Ullah
Electrical & Computer Engineering Theses & Dissertations
The growth of information and communication technology is constantly revolutionizing various domains, e.g., energy utility systems, healthcare, the internet of things, etc. This inception of widespread cyber technology enables reliability and first operability of the system, yet simultaneously imposed a risk of significant impact due to disruption of safe and secure operation. The attack surface is expanding, creating a cyber exposure gap which indicates a higher threat landscape and increased risk of compromise. Motivated by this increased threat exposure, this dissertation investigates the attack surface as a static and dynamic indicator of adversary propagation, seeking an efficient modeling paradigm to …
The Influence Of Emotion Regulation And Neural Cognitive Control On Distress Tolerance, Alicia L. Milam
The Influence Of Emotion Regulation And Neural Cognitive Control On Distress Tolerance, Alicia L. Milam
Psychology Theses & Dissertations
Tolerance of negative emotions has been associated with transdiagnostic negative mental health outcomes. Theory and research implicate emotion regulation and cognitive control as factors in tolerance of negative emotions. But their unique contributions to tolerance of negative emotions and interdependency have been unclear due to methodological limitations. This study aimed to explicate cognitive and emotional factors affecting distress tolerance in a non-clinical sample of emerging adults. Undergraduate psychology students completed self-report measures of emotion regulation ability and tolerance of negative emotions. The N2 ERP component elicited by a Go-NoGo task was also used as a neurophysiological marker of cognitive control …
An Experimental Investigation Into The Impact Of Acute Stress On Alcohol Craving Through Implicit Coping Motives, Douglas J. Glenn
An Experimental Investigation Into The Impact Of Acute Stress On Alcohol Craving Through Implicit Coping Motives, Douglas J. Glenn
Psychology Theses & Dissertations
Drinking to cope with negative emotions is associated with many negative alcohol-related outcomes such as increased alcohol use, drinking-related problems, and alcohol use disorders. An acute stressor is one example of a stimulus leading to negative emotions that an individual may wish to avoid. Research has shown that acute stress positively relates to drinking. Specifically, previous experimental studies have shown that individuals exposed to a stressor drink more alcohol and have stronger urges to drink than those not exposed to a stressor. Thus, it may be that drinking to cope explains why people experience alcohol cravings after experiencing a stressor. …
The Impact Of A Crisis Intervention Team Program On Psychiatric Boarding, Kurtis Hooks
The Impact Of A Crisis Intervention Team Program On Psychiatric Boarding, Kurtis Hooks
Counseling & Human Services Theses & Dissertations
Psychiatric boarding is the phenomenon of housing individuals in emergency departments while awaiting access to mental health services in the community. The expansion of psychiatric boarding is attributed to continued deinstitutionalization and under-resourcing of mental health services. Psychiatric boarding is also associated with deleterious outcomes for individuals in need of access to behavioral health services, facilities. There is limited research on programmatic efforts to reduce psychiatric boarding as it pertains to Crisis Intervention Team programs colocated in medical settings. Crisis Intervention Team (CIT) programs are community-based, multi-stakeholder partnerships that include dedicated assessment centers crisis response and referral. This study utilized …
Covid-19, Technology, And The Math Classroom: Changes, Obstacles, And Victories Integrating Digitally, Lauren Fifield Bellamy
Covid-19, Technology, And The Math Classroom: Changes, Obstacles, And Victories Integrating Digitally, Lauren Fifield Bellamy
Teaching & Learning Theses & Dissertations
Secondary math teachers faced new experiences and struggles this past virtual school year due to the global COVID-19 pandemic. Nine secondary math teachers from a school division in southeastern Virginia participated in this qualitative single case study. Data collection included individual semi-structured interviews and technology integration artifacts. Through a three round coding process, ten themes emerged to answer the following three research questions: 1) In terms of curriculum, teaching methods, and assessments, how did teachers describe their pedagogical change in virtual learning? 2) How do teachers perceive student performance has changed within the virtual learning space? 3) From teachers’ perspectives, …
Genetically Engineered Thermosynechococcus Elongatus Bp1: Assessment Of Potential Biorisks And Biofuel Production, Thu Ho Anh Nguyen-Jones
Genetically Engineered Thermosynechococcus Elongatus Bp1: Assessment Of Potential Biorisks And Biofuel Production, Thu Ho Anh Nguyen-Jones
Chemistry & Biochemistry Theses & Dissertations
According to the International Energy Outlook 2019, released by the U.S. Energy Information Administration, it is projected that the energy consumption will increase up to 50% between 2018 and 2050 worldwide. As fossil fuel being a finite source of energy with the risk of depletion, many countries are now facing an energy security crisis. Therefore, it is important to develop other renewable and sustainable energy sources that will allow countries to shift away from depending on fossil fuels. Among several types of renewable energy, biofuel production using genetically engineered cyanobacteria is capturing much interest due to its many advantages. Different …
Longitudinal Monitoring Of Tumor Response To Immune Checkpoint Inhibitors Using Diffuse Optical Spectroscopy, Joel Isaac Rodriguez Troncoso
Longitudinal Monitoring Of Tumor Response To Immune Checkpoint Inhibitors Using Diffuse Optical Spectroscopy, Joel Isaac Rodriguez Troncoso
Graduate Theses and Dissertations
Immune checkpoint drugs have completely changed the way people treat metastatic melanoma and non-small-cell lung cancer. While the impacts of these immunological checkpoints and their suppression on T cell function are well characterized, their consequences on the tumor microenvironment are not. In a CT26 mouse colorectal cancer model, we employed diffuse reflectance spectroscopy to track in vivo tumor microenvironmental alterations in response to immune checkpoint inhibitors. On three separate days, animals bearing CT26 tumor xenografts were given anti-PD-L1, anti-CTLA-4, a combination of both inhibitors, and isotype control. Within the first 6 days, monotherapy with either anti-PD-L1 or anti-CTLA-4 resulted in …
Design, Synthesis, And Catalytic Application Of Crystalline Porous Nanomaterials, Zainab Abdullah Almansaf
Design, Synthesis, And Catalytic Application Of Crystalline Porous Nanomaterials, Zainab Abdullah Almansaf
Graduate Theses and Dissertations
Chapter 1: COFs (covalent organic frameworks) are a new type of microporous crystalline polymer connected by organic units via strong covalent bonds. Due to their well-defined crystalline structures and excellent chemical and thermal stabilities, COF materials are considered promising candidates in applications such as gas adsorption, catalysis, and energy storage.Chapter 2: A new covalent organic framework (COF) based on imine bonds was assembled from 2-(4-formylphenyl)-5-formylpyridine and 1,3,6,8-tetrakis(4-aminophenyl)pyrene, which showed an interesting dual-pore structure with high crystallinity. Postmetallation of the COF with Pt occurred selectively at the N donor (imine and pyridyl) in the larger pores. The metalated COF served as …
Preliminary Development Of The Dialysis-Membrane-Based Passive Biocide Delivery System For Spacecraft Water Recovery Units, Rogelio Elias Garcia Fernandez
Preliminary Development Of The Dialysis-Membrane-Based Passive Biocide Delivery System For Spacecraft Water Recovery Units, Rogelio Elias Garcia Fernandez
Graduate Theses and Dissertations
The purpose of this investigation is to explore the capabilities of a dialysis-membrane-based system for the in-line dosing of silver ions to treated water in spacecraft water recovery units. The spacecraft environmental control and life support system community (ECLSS) are interested in adopting silver ions as a biocide in future spacecraft water recovery processes since silver ions are effective biocide at concentrations that humans can safely consume. The system has been designed following the configuration of the Water Processor Assembly (WPA) aboard the International Space Station. In this configuration, silver ions have to be added at the last step in …
Evapotranspiration In Mid-South Rice Production, Colby Wade Reavis
Evapotranspiration In Mid-South Rice Production, Colby Wade Reavis
Graduate Theses and Dissertations
Rice provides much needed sustenance to a large portion of the global population, particularly in the developing world. With stress placed on food production systems under the reality of climate change and an increasing global population, rice production systems require solutions to a number of issues, including a limited water supply. As producers explore new strategies for conserving local water resources to continue to maintain yields, new irrigation strategies and technologies are being developed and validated for use at commercial production scales. Alternate wetting and drying (AWD) is an irrigation practice that provides water savings through the capture of rainfall …
Investigating Effects Of Microenvironmental Stress On Cell Metabolism Using Multiphoton Imaging, Lisa Rebello
Investigating Effects Of Microenvironmental Stress On Cell Metabolism Using Multiphoton Imaging, Lisa Rebello
Graduate Theses and Dissertations
Resistance to therapy in cancer is a major cause of poor prognosis in patients. Tumor hypoxia plays an active role in mediating treatment resistance and has been linked to metastases and metastatic potential in cancer. Our research focused on three objectives: i) To understand metabolic effects of chronic and intermittent hypoxia in murine breast cancer cells and its affiliation with metastatic potential ii) To identify the metabolic changes associated with radiation therapy in a panel of radiosensitive and radioresistant human head and neck cancer cells and iii) to monitor the changes in cell metabolism associated with gain of treatment resistance. …
Understanding The Chemical Structures Of Polydopamine, Deborah Takyibea Okyere
Understanding The Chemical Structures Of Polydopamine, Deborah Takyibea Okyere
Graduate Theses and Dissertations
Polydopamine (PDA) is described as a bioinspired polymer produced by a method involving the chemical oxidation of dopamine in a pH-dependent medium. It has been used for the functionalization of nanomaterials in diverse applications including drug delivery and biosensing because of its strong adhesiveness, functionality is easily modified, and biocompatibility with mammalian cells and tissues. The polymerization process is believed to be initiated by the autoxidation of dopamine to dopaminequinone. However, the repeating units, as well as the final structure of PDA, are not well understood. Hence, this work focuses on the characterizations of the PDA structures during formation and …
A Case Study Of Eastern Region Arkansas Promise Participants And Their Expectations For The Future, Robin Freeman
A Case Study Of Eastern Region Arkansas Promise Participants And Their Expectations For The Future, Robin Freeman
Graduate Theses and Dissertations
The purpose of this study was to develop an in-depth understanding of how Eastern Arkansas youth with disabilities and their parents describe their expectations for the future, after participating in the Arkansas PROMISE program. The study sought an understanding of how participants viewed themselves and their expectations for the future, for employment, for participation in higher education, for independent living, and for future financial support. The research used a case study approach, interviewing five students and five parent participants. Participants were asked a series of questions to get an understanding of their experiences, their expectations for the future, and their …
Investigation Of Histomoniasis Prevention In Poultry, Lesleigh Beer
Investigation Of Histomoniasis Prevention In Poultry, Lesleigh Beer
Graduate Theses and Dissertations
Histomonas meleagridis is the etiological agent of histomoniasis, also commonly known as blackhead disease. This protozoal disease of poultry is detrimental to turkeys with flock mortalities often reaching 80-100%, although other gallinaceous birds are susceptible. Since the voluntary removal of nitarsone in 2015, the poultry industry is suffering with no approved prophylactics, therapeutics, or vaccines for this disease. The objectives of this dissertation were to evaluate multiple methods for prevention or control of histomoniasis, including dietary chemoprophylaxis and vaccination. Specifically, this research evaluated quinine as a chemoprophylactic candidate (Chapter 3) or live-attenuated H. meleagridis as vaccine candidates (Chapter 4) in …
Efficacy Of Selected Powdered Floor Treatments And Turmeric Rhizome Powder Against Salmonella, E. Coli, And L. Monocytogenes On Polyurethane-Concrete Flooring Material Carriers, Robert Sidney Fuller
Efficacy Of Selected Powdered Floor Treatments And Turmeric Rhizome Powder Against Salmonella, E. Coli, And L. Monocytogenes On Polyurethane-Concrete Flooring Material Carriers, Robert Sidney Fuller
Graduate Theses and Dissertations
The flooring in a food processing environment can become contaminated with pathogenic bacteria in many ways including foot and equipment traffic, incoming materials, and drain backups. Turmeric (Curcuma longa L.) rhizome powder and seventeen other commercially available powdered floor treatments with a variety of active ingredients including quaternary ammonium compounds (QAC), sodium percarbonate and similar perhydrates (SPC), urea, and borax, were investigated for reducing the levels of pathogens on flooring thereby reducing the risk of cross-contamination from the floor to food contact surfaces. Some of the commercially available floor treatments were Environmental Protection Agency (EPA) registered antimicrobials while others were …
Analysis Of Bacteriorhodopsin Suspended In A Bilayer Lipid Membrane, Moath Alhejji
Analysis Of Bacteriorhodopsin Suspended In A Bilayer Lipid Membrane, Moath Alhejji
Graduate Theses and Dissertations
The bacteriorhodopsin protein’s unique characteristic of proton pumping can convert light energy to electric energy. The aim of this research was to generate photocurrent using bacteriorhodopsin in a bi-layer lipid membrane. Lipid monolayer and bilayer were formed using painting and folding methods, respectively. Capacitance and resistance of the lipid membranes were measured and used to validate the best methodology. My results show that the folding method is more efficient in incorporating Bacteriorhodopsin. The photocurrent was generated by illuminating a green laser (532 nm) on the bilayer lipid membranes. The patch clamp electrophysiology technique was used to apply voltage across the …
A Song Of The Bluff: The Phoenix Of Pine Bluff Arkansas - Documentary, Neba Evans
A Song Of The Bluff: The Phoenix Of Pine Bluff Arkansas - Documentary, Neba Evans
Graduate Theses and Dissertations
Pine Bluff, Arkansas has long grappled with a reputation as a town riddled with crime and violence. Once a thriving agricultural center of the state, Arkansas residents tend to score the town’s successes as relics of the past. Economic decline, negative migration systems like white flight and brain drain, and racial disparities ties to the city’s roots has continued to take its toll on the city. Nonetheless, the community of Pine Bluff knows excellence has and continues to prosper there. A Song of the Bluff is a 15-minute documentary that seeks to flip the negative narrative by confronting these stereotypes …
The Nature Of Informal Educators In Science Centers, Science Museums And Zoos: Case Studies Of Personnel, Practices, Programs, Outreach And Organization, Courtney Erickson
The Nature Of Informal Educators In Science Centers, Science Museums And Zoos: Case Studies Of Personnel, Practices, Programs, Outreach And Organization, Courtney Erickson
Graduate Theses and Dissertations
Informal Science Centers provide educational experiences for people across the country daily. While the terminology is often similar, there are differences between institutions, often determined by mission, organizational structure, and experience. The purpose of this study was to identify shared experiences and unique characteristics of eight informal science centers around the country. The significance of the study was to add to the understanding of informal science educators' responsibilities, organizational structure, decision-making process, and development. Data for the study was collected using qualitative measures through a researcher-created interview, sent to fifteen institutions, after the recommendation from two well-known informal science researchers. …
Sensitivity Of Soybean And Rice To Dicamba, Owen Wesley France
Sensitivity Of Soybean And Rice To Dicamba, Owen Wesley France
Graduate Theses and Dissertations
Although the integration of dicamba as a postemergence (POST) herbicide has proven useful in controlling many herbicide-resistant weeds, its damage to soybean at low rates, such as supplied by drift and volatility, has been well-documented. Injury to other crops, such as rice, from off-target movement of dicamba and other commonly used herbicides, such as glyphosate, may also occur. Practical options for mitigating injury and yield loss to soybean and other crops from dicamba off-target movement could prove beneficial if dicamba continues to be used during summer months. Experiments were conducted to determine the effects of multiple agricultural practices, including cultivar …
Parenting The Gifted: Caregivers’ Perspectives Of Challenges And Their Confidence To Support Their Exceptional Children, Kristi A. Mascher
Parenting The Gifted: Caregivers’ Perspectives Of Challenges And Their Confidence To Support Their Exceptional Children, Kristi A. Mascher
Graduate Theses and Dissertations
This phenomenological study uses Bandura’s theory of self-efficacy (1977) to examine the lived experiences of eight parents of gifted children and how their experiences, both positive and negative, shape their perception of their confidence and may contribute to building future supports for gifted parents and caregivers. Qualitative data, collected through semi-structured interviews and analyzed with an interpretive/hermeneutic lens, provides seven major themes derived from the voices of parents with children of varying ages and exceptionalities. In addition, this study concludes with a discussion surrounding the additional challenges associated with parenting the exceptional, frameworks for gifted parent support systems, as well …
Catalytic Activity Of Molybdenum-Dioxo Complexes, Randy Tran
Catalytic Activity Of Molybdenum-Dioxo Complexes, Randy Tran
Graduate Theses and Dissertations
This dissertation details the development of rationally designed dioxomolybdenum catalyst active for deoxydehydration (DODH), the net reduction of diols and polyols into alkenes and dienes. Catalyst design involved variations on dioxomolybdenum(VI) supported by a dianionic meridional pincer ligand. Rational substrate scope was explored using aliphatic diols, aromatic diols, and biomass derived diols. Various reductants were tested for ability to catalyze the reaction. The substrate specific mechanism of DODH was explored utilizing NMR and in-situ infrared spectroscopy and important rate constants and rate determining steps were found to aid in the optimization of ideal reaction conditions. Catalytic activity was observed to …
The Role Of Sex: An Analysis Of U.S. Attitudes Toward Climate Change, Chloe Riggs
The Role Of Sex: An Analysis Of U.S. Attitudes Toward Climate Change, Chloe Riggs
Graduate Theses and Dissertations
This study analyzes the intersection of sex, environmental risk perception of climate change, and feminism. More specifically, with a sample size of 8,280 respondents from the American National Election Studies (ANES) 2020 Times Series Study, this research examines the relationship between pro-environmental attitudes and sympathy for feminism, controlling for sex, as well as if a measure of sympathy for feminism influences pro-environmental attitudes, controlling for demographic (age, education, race, sex, and income) and political preference (political ideology and party affiliation) variables. Previous literature strongly supports a sex gap in risk perception, a pattern known as the White Male Effect (WME) …
The Passion Of Ken Williams: The Double Life Of A Mayor, The Newspaper That Brought Him Down, And The Story Of Journalism In America, Michael Adkison
The Passion Of Ken Williams: The Double Life Of A Mayor, The Newspaper That Brought Him Down, And The Story Of Journalism In America, Michael Adkison
Graduate Theses and Dissertations
In November 2007, a team of reporters from the Benton County Daily Record published an expose revealing that Ken Williams, the mayor of Centerton, Arkansas, had been living a double life. In his former life as Don LaRose, he was a preacher in the Northeast, who one day vanished without a trace. His wild saga includes Satanists, truth serums, and a supposed murder. The Benton County Daily Record confronted the former reverend several times before he finally confessed to his double life. The next morning, he resigned as mayor, saying that the decisions he made were for the protection of …