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Articles 81661 - 81690 of 1826828
Full-Text Articles in Entire DC Network
Investigating The Microbial Communities In Freshwaters Of Northern Sweden, Maizy Wilcox
Investigating The Microbial Communities In Freshwaters Of Northern Sweden, Maizy Wilcox
Undergraduate University Honors Capstones
Climate change is shifting the stability of sensitive ecosystems in the Arctic region due to global warming, with widespread impacts on permafrost regions, including the Stordalen Mire region of Sweden. Due to climate change, the Stordalen Mire is composed of thawing permafrost shifting into a wetland (V onk et al., 2015). As permafrost thaws, the landscape transforms due to changing water environmental conditions, causing lower pH changes and higher temperatures in the water, impacting the underlying soil chemistry and biology, vegetation, and microbial communities (Webb et al., 2022). The increased temperature can enhance methanogenic microbial growth by expanding the groundwater …
Applying Conservation Biology Principles In Federal Conservation Efforts For Candidate, Threatened, And Endangered Species, Kenna Fung
Natural Resources Journal
As human activities continue to accelerate the extinction of species, federal and state programs emerge as some of the last solutions to wildlife protection in the United States. Since the establishment of the Endangered Species Act (“ESA”) in 1973, the U.S. Fish and Wildlife Service (“the Service”) has designated occupied and unoccupied critical habitats for threatened and endangered species as part of the species’ recovery plan. A recent U.S. Supreme Court case signaled that courts are less willing to grant the Service the same deference to designate areas as critical habitats as before. Because the ESA never defined “habitat,” the …
Inclusive Workforce Development For An Equitable Low-Carbon Transition, Shannon Sanchez-Youngman, Gabriel Pacyniak, Melanie Sayuri Sonntag, Addison Fulton
Inclusive Workforce Development For An Equitable Low-Carbon Transition, Shannon Sanchez-Youngman, Gabriel Pacyniak, Melanie Sayuri Sonntag, Addison Fulton
Natural Resources Journal
The shift to a low-carbon economy will require a massive build out of low-carbon technologies, which in turn will require millions of new laborers with specific skills. Similarly, the decline of fossil-fuel industries will require retraining and new job opportunities for laborers in these fields. At the same time, there is an emerging scholarly focus on a “just transition” to a low-carbon economy. This essay conceptualizes inclusive workforce development as a key component of a just transition. Inclusive workforce development promotes policies that reach and effectively serve the broadest possible range of people and communities. In particular, inclusive workforce development …
Water Governance And Water Futures In The United States And Australia, Robert Haskell Abrams
Water Governance And Water Futures In The United States And Australia, Robert Haskell Abrams
Natural Resources Journal
The world’s hydroclimate has become more extreme in the last several decades—a phenomenon described in technical terms as the loss of stationarity. Focusing particularly on the drought-induced stresses, this Article examines water governance in the American West and Australia seeking aspects in the laws, institutions, and approaches of each nation that could be adapted to advantage by the other in coping with the onset of reduced flows in major river basins—most prominently, the Colorado in the U.S. and the Murray-Darling in Australia. Significant similarities of history, settlement of arid regions, and legal systems abound. These include Anglo settlement bringing riparian …
The Fallout Of The Trinity Test: The Need To Expand Reca To Include New Mexico Downwinders, Angélica Ortega
The Fallout Of The Trinity Test: The Need To Expand Reca To Include New Mexico Downwinders, Angélica Ortega
Natural Resources Journal
The Radiation Exposure Compensation Act (“RECA”), which offers one-time payments to designated individuals who have developed specific diseases and cancers due to radiation exposure, was set to expire on June 10, 2024. On March 7, 2024, the U.S. Senate passed Senate Bill 3853 (“S. 3853”), the “Radiation Exposure Compensation Reauthorization Act” which would continue RECA payments for an additional six years and would allow for more individuals to be eligible for these payments. However, the bill has not become law because it is still pending review by the U.S. Congress. One of the groups that would be eligible for these …
You Are What You Spray: How New Mexico Can Better Protect Farmworkers From Pesticides, Rachel Swanteson-Franz
You Are What You Spray: How New Mexico Can Better Protect Farmworkers From Pesticides, Rachel Swanteson-Franz
Natural Resources Journal
The impact of pesticides on farmworkers is at the intersection of environmental and labor law. Existing federal regulations designed to protect farmworkers from pesticide exposure and illness have failed to adequately do so. While some states have tried to fill these gaps by enacting state regulations, New Mexico is not one of them. However, by borrowing and combining regulatory protections from other states, New Mexico could become a leader in this area. This note first provides a detailed summary of the federal protections and the regulatory history while summarizing criticisms from farmworker advocates. Next, it provides a comprehensive overview of …
Seismological Applications To Crustal Deformation And Explosion Discrimination, Olumide Adedeji
Seismological Applications To Crustal Deformation And Explosion Discrimination, Olumide Adedeji
Earth and Planetary Sciences ETDs
There are many outstanding questions in seismology and plate tectonics that remain unresolved due to the complexity of seismic wave propagation, fault system evolution, and sedimentary-tectonic interactions. In this dissertation, I analyze seismic and acoustic data to improve event discrimination, understand strain partitioning along a transpressive plate boundary, and investigate the influence of tectonic deformation on sedimentary processes. Using seismic arrays, I assess the detectability of Ground Coupled Airwaves (GCA) generated by shallow borehole explosions and earthquakes, demonstrating that GCA detections are highly dependent on source type, environmental conditions and sensor distribution. Along the Queen Charlotte Plate Boundary, I analyze …
Partnering For Youth Empowerment: Establishing Boys And Girls Clubs In Tribal Communities, Johnny Abeyta Jr.
Partnering For Youth Empowerment: Establishing Boys And Girls Clubs In Tribal Communities, Johnny Abeyta Jr.
Teacher Education, Educational Leadership & Policy ETDs
This study examined why Boys and Girls Clubs are not available in every tribal community and explored how culturally grounded youth programs support leadership, identity, and sovereignty. Using Tribal Critical Race Theory, Narrative Inquiry, and Indigenous Research Methods, the study centered the voices of Pueblo leaders, educators, policymakers, and alumni. Interviews identified barriers related to funding, transportation, facilities, and policy alignment. Participants described culture, mentorship, and safe spaces as essential for youth belonging and empowerment. The study introduced the Relational Sovereignty Model, which explains how cultural teachings, shared learning, resilience, and community care work together to support Indigenous youth. The …
Reaching Tomorrow’S Extension Customer: A Food And Health Needs Assessment, Morgan Szczepaniak, Sarah L. Francis, Ruth Litchfield, Ulrike Genschel, Shannon Coleman, Anirudh Naig
Reaching Tomorrow’S Extension Customer: A Food And Health Needs Assessment, Morgan Szczepaniak, Sarah L. Francis, Ruth Litchfield, Ulrike Genschel, Shannon Coleman, Anirudh Naig
Journal of Extension
The food and health needs and preferences of Iowans (n=452) were examined. The leading food and health information sources were online platforms, social media, and print media. Program topics with high participation likelihood were cooking, food preservation, food safety, and gardening. Short, low-cost, online programs were preferred. Extension use was more likely among those who identified as persons of color, Hispanic/Latino, or were food insecure (p < 0.030). Those with less education and chronic disease were less likely to be interested in Extension programming (p < 0.040). These results provide valuable information regarding future directions for Extension programming.
Barriers Rural African American Mothers Experience Accessing Healthcare, Lovelia Dixon
Barriers Rural African American Mothers Experience Accessing Healthcare, Lovelia Dixon
Walden Dissertations and Doctoral Studies
Walden University College of Psychology and Community Services This is to certify that the doctoral dissertation by Lovelia Latrese Dixon has been found to be complete and satisfactory in all respects, and that any and all revisions required by the review committee have been made. Review Committee Dr. Tracy Jackson, Committee Chairperson, Human Services Faculty Dr. Antoinette Pigatt, Committee Member, Human Services Faculty Chief Academic Officer and Provost Sue Subocz, Ph.D. Walden University 2025 The study examined the barriers African American mothers living in rural areas face when accessing healthcare due to lack of information, transportation, and affordability. Understanding the …
Strategies To Identify And Manage Toxic Leaders For Mitigating Organizational Toxicity, Ellen Scott
Strategies To Identify And Manage Toxic Leaders For Mitigating Organizational Toxicity, Ellen Scott
Walden Dissertations and Doctoral Studies
The prevalence of toxic leadership across various sectors like healthcare, the military, corporations, and educational institutions presents a significant challenge, undermining organizational culture and employee well-being, leading to increased turnover and reduced performance. Guided by the toxic triangle as the conceptual framework, this qualitative Delphi study’s purpose involved leadership experts from across the United States to reach a consensus on organizational strategies for identifying, managing, and mitigating organizational toxicity. The research questions were focused on determining the most suitable strategies for recognizing toxicity in the organization and addressing it effectively. A panel of 30 leadership experts from across the United …
Perceptions Of Connections Among Technology Instructors And Their Students Working Remotely, Angela Dawn Riddle
Perceptions Of Connections Among Technology Instructors And Their Students Working Remotely, Angela Dawn Riddle
Walden Dissertations and Doctoral Studies
In 2020, educators were forced to learn new ways to instruct students due to the COVID-19 pandemic. In response to the transition from in-person to online courses, educators explored new ways of producing the learning experience. Due to the hands-on nature of industrial and engineering technology, these courses did not generally use online learning systems. The purpose of this qualitative study was to explore the experiences of industrial and engineering technology instructors connecting with students remotely during this period. Garrison’s community of inquiry framework was used to ground the study and understand the connection that occurs in the learning environment …
Gender And Age Differences Among Juvenile Homicide Offenders, Amanda Nichole-Wells Jabaay
Gender And Age Differences Among Juvenile Homicide Offenders, Amanda Nichole-Wells Jabaay
Walden Dissertations and Doctoral Studies
The involvement of juveniles in homicide-related crimes has been a matter of growing public concern in the United States. Although prior research suggests that boys and girls who kill vary in important ways, there is limited research that has examined gender and age differences among juvenile homicide offender (JHO) characteristics and crime-related variables on a national level, with only eight previous national studies to date. Guided by the social control theory, the purpose of this non-experimental quantitative study was to explore gender and age differences among JHOs and other crime-related variables on a current national level. Archival data (N = …
The Effects Of Sudden Telework On The Productivity And Engagement Of Hr Employees, Lisa Renee Schlichtig
The Effects Of Sudden Telework On The Productivity And Engagement Of Hr Employees, Lisa Renee Schlichtig
Walden Dissertations and Doctoral Studies
The COVID-19 pandemic forced a change in how individuals perceived the way of conducting work in the United States. Human resources (HR) leaders need to understand this change because many employees lost their jobs without the means for sustainable work. Other employees maintained their jobs, suddenly shifting to telework, resulting in mixed productivity and work engagement levels. The purpose of this quantitative moderation analysis study was to examine whether there was a moderating effect of employer-provided psychological resources on perceived productivity and work engagement among HR employees after the sudden shift to telework. The conservation of resources theory and the …
Barriers Faced By College Sexual Violence Survivors Who Identify As A Racial And Gender Minority, Brittany A. Gordon
Barriers Faced By College Sexual Violence Survivors Who Identify As A Racial And Gender Minority, Brittany A. Gordon
Walden Dissertations and Doctoral Studies
Sexual violence is a significant issue in the US, and specifically on college campuses. Students who identify as a racial and gender minority have been found to be at increased risk. While research has examined the barriers to disclosure, reporting, or help-seeking among survivors within higher education who identify as a racial minority and those who identify as a gender minority, no qualitative studies have looked at the barriers faced by student survivors who identify as both a racial and gender minority. The purpose of this study was to understand the barriers faced by students who identify as a racial …
From Tree Rings To Streamflow: Reconstructing The Hydroclimatic History Of The Mississippi River Basin Over The Past Millennia, Brandon Mcdaniel
From Tree Rings To Streamflow: Reconstructing The Hydroclimatic History Of The Mississippi River Basin Over The Past Millennia, Brandon Mcdaniel
Theses and Dissertations
The Mississippi River Basin (MRB), the largest watershed in the United States, plays a central role in shaping regional hydroclimate. This study reconstructs streamflow variability in the MRB from the year 1200 to 2005 by applying principal component regression to streamflow data from 51 gauges and the North American Drought Atlas (NADA), a tree-ring-based reconstruction of the summer self-calibrating Palmer Drought Severity Index. Verification statistics indicated strong predictive skill across the domain. These findings provide critical insight into long-term hydroclimatic variability in the MRB and underscore the value of paleoclimate records for improving water resource assessments.
A Rapid Artificial Neural Network Interatomic Potential For Bismuth, Lee Michael Mayfield Jr.
A Rapid Artificial Neural Network Interatomic Potential For Bismuth, Lee Michael Mayfield Jr.
Theses and Dissertations
To study molecular dynamics in bismuth, Quantum Espresso was used to create a density functional theory (DFT) database which was then used as the input for rapid artificial neural network (RANN). The RANN interatomic potential that was developed using this database was then validated. Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) was used to create simulations and gather data using the RANN potential. The properties of bismuth, including elastic constants, melting points, and volume change, were calculated and compared to DFT and experimentally observed data. The RANN potential coincided well with these values. The RANN potential shows good predictive capabilities for …
Asphalt Durability Improvements By Way Of Specification Advancements, Jessica V. Lewis
Asphalt Durability Improvements By Way Of Specification Advancements, Jessica V. Lewis
Theses and Dissertations
The objective of this dissertation is to provide content through which industry and agencies can adjust and/or update standards and specifications, as appropriate, to accommodate the present-day needs of the asphalt industry towards producing more durable asphalt. A total of 78 asphalt mixtures and 9 asphalt binders were evaluated for up to 10 years of field aging to provide content that was analyzed to meet this objective. A full-scale aging site in Columbus, Mississippi was the focal point of the aging experiments. A major conclusion from this work was that Cantabro Mass Loss (CML) testing of cores was able to …
Impact Of Circular And Non-Circular Nozzle Exit Geometries On Jet Flow Propagation And Turbulence Characteristics, Hiba Maazioui
Impact Of Circular And Non-Circular Nozzle Exit Geometries On Jet Flow Propagation And Turbulence Characteristics, Hiba Maazioui
Theses and Dissertations
This thesis aims to investigate the impact of nozzle exit geometry on jet flow propagation and turbulence characteristics. Computational fluid dynamics simulations were performed using ANSYS Fluent, employing the Reynolds-Averaged Navier-Stokes (RANS) approach, to compare circular, elliptic, and rectangular nozzle geometries. The analysis focused on velocity distributions, turbulence characteristics, and cross-flow interactions. Results indicate that circular jets have the longest potential core and slowest velocity decay, reflecting lower mixing rates. In contrast, elliptic and rectangular jets have shorter potential cores, faster velocity decay, and elevated TKE peaks, suggesting enhanced turbulence and mixing. These findings highlight the significant role of nozzle …
Cyber Security Threat Recognition And Preparedness Of Undergraduate Students, Litany Hope Lineberry
Cyber Security Threat Recognition And Preparedness Of Undergraduate Students, Litany Hope Lineberry
Theses and Dissertations
Cybersecurity awareness and preparedness are critical competencies for individuals across academic disciplines and professional sectors. However, undergraduate students often lack sufficient knowledge and skills to recognize and mitigate cybersecurity threats. This dissertation examines cybersecurity threat recognition and preparedness among undergraduate students through a three-phase research approach. Study 1 explores faculty perspectives on students' cybersecurity awareness, identifying gaps in knowledge and preparedness across various fields of study. Study 2 investigates industry professionals' perceptions of new hires’ cybersecurity readiness, assessing the alignment between academic training and industry expectations. Study 3 evaluates the effectiveness of an online intervention designed to enhance students' cybersecurity …
Advancing Wood Chip Moisture Content Prediction Using Advanced Generative Ai Techniques, Daniel Esteban Marulanda
Advancing Wood Chip Moisture Content Prediction Using Advanced Generative Ai Techniques, Daniel Esteban Marulanda
Theses and Dissertations
In this study we propose a deep learning method to optimize the classification of wood chip moisture content levels using the Vision Transformer and then ultimately increase the classification performance by creating synthetic images using the diffusion transformer model. In the first chapter of our study, we complete a detailed explanation of how the moisture content levels of 10 different wood chips were gathered ranging from 2 to 50$\%$. This chapter serves as a foundation for subsequent sections, illustrating the challenges associated with the current data collection process, which is both time-consuming and inefficient. Accurately determining moisture content for wood …
The Effect Of X-Ray Irradiation Technology On Salmonella Spp. And Quality Parameters Of Ready-To-Bake Chocolate Chip Cookie Dough, Kala Grace Morris
The Effect Of X-Ray Irradiation Technology On Salmonella Spp. And Quality Parameters Of Ready-To-Bake Chocolate Chip Cookie Dough, Kala Grace Morris
Theses and Dissertations
Salmonella contamination in cookie dough poses a threat to consumers. This study investigated the effect of X-ray irradiation on Salmonella-inoculated ready-to-bake chocolate chip cookie dough and its impact on dough quality. A Salmonella cocktail (~10 log CFU/g) was prepared and inoculated into cookie dough samples (~6.5 log CFU/g) and then treated with X?ray irradiation (0.25, 0.5, and 1 kGy). Salmonella decreased by 1.15, 1.79, and 2.49 log CFU/g, at an exposure of 0.25, 0.5, and 1 kGy, respectively. Quality parameters (pH, aw, and colorimetry) were evaluated for two brands. No statistical difference (P>0.05) in pH was observed for Brand …
Investing In Your Own: How University Leaders Should Aim To Invest To Retain Quality Staff In Undergraduate Recruitment Offices, Grant Alexander Nerren
Investing In Your Own: How University Leaders Should Aim To Invest To Retain Quality Staff In Undergraduate Recruitment Offices, Grant Alexander Nerren
Theses and Dissertations
This quantitative narrative inquiry study examined the experiences of undergraduate recruitment professionals, and the impact institutional investment can influence staff retention of these professionals within higher education. Using Job Embeddedness Theory often applied within private industry and Bolman and Deal’s (2017) human resource theoretical framework, the research question was: To what extent are specific dimensions (support, compensation, professional advancement) of institutional investment related to the retention of undergraduate recruitment professionals within higher education? Data were collected using an anonymous online survey that was shared with potential participants via email. Responses were analyzed through SPSS software using item-level and composite score …
Utilizing Novel Application Methods To Mitigate Antagonism With Combinations Of Auxin And Grass Control Herbicides, Jake Patterson
Utilizing Novel Application Methods To Mitigate Antagonism With Combinations Of Auxin And Grass Control Herbicides, Jake Patterson
Theses and Dissertations
Auxin and grass control herbicides are often applied in tank mixtures to provide multiple modes of action and to achieve broad-spectrum weed control. Literature indicates that auxin herbicides, when mixed in solution, may antagonize grass control herbicides, resulting in decreased grass weed control compared to the grass herbicide applied alone. Field and laboratory experiments were conducted in 2022, 2023, and 2024 at multiple locations in Mississippi. These experiments had three objectives: 1) evaluate grass weed control with glyphosate and clethodim in response to the simultaneous application with either dicamba or 2,4-D, using a commercially available direct-injection system compared to tank-mix …
Large-Scale Reserve Constrained Alternating Current Optimal Power Flow Methods, Yehong Peng
Large-Scale Reserve Constrained Alternating Current Optimal Power Flow Methods, Yehong Peng
Theses and Dissertations
The Alternating Current Optimal Power Flow (ACOPF) problem seeks optimal operational planning for power systems with the lowest cost within the operational and physical constraints, ensuring higher efficiency and reliability for the power system. Meanwhile, the power reserve scheduling, which ensures an adequate backup capacity to compensate for demand and supply fluctuations, contingencies, and various unforeseen disruptions, plays a crucial role in power system reliability. As power systems become more stochastic and dynamic, the co optimization of energy and reserve becomes a significant trend among independent system operators (ISOs) and regional transmission organizations (RTOs), as it yields substantial benefit improvement …
Enhancing Chemical Synthesis For Sustainability And Process Monitoring Utilizing Group Ten Metal Catalysis, Amanda M. Perkins
Enhancing Chemical Synthesis For Sustainability And Process Monitoring Utilizing Group Ten Metal Catalysis, Amanda M. Perkins
Theses and Dissertations
This thesis explores two sustainable methodologies by modifying established catalytic processes using group ten metal complexes from nickel and palladium. Efforts were made to provide alternatives for processes that often do not follow the principles of green chemistry. In the first project, a nickel(II) N-heterocyclic carbene complex was used to perform catalytic hydrogenation of 2-acetylpyridine under mild conditions. The complex was synthesized and characterized with techniques including mass spectrometry and 1H-NMR. Following this, the reactions were carried out to optimize conditions and yield moderate conversions. For the second project, the Suzuki-Miyaura cross coupling of 7-chlorotryptophan occurred utilizing a palladium complex …
Establishing A Baseline For Detecting Lotl Attacks In Windows Operating Systems, Ashlyn Martin Phillips
Establishing A Baseline For Detecting Lotl Attacks In Windows Operating Systems, Ashlyn Martin Phillips
Theses and Dissertations
There has been an increasing realization of the rise in living off the land (LOTL) attacks where adversaries misuse legitimate system tools, particularly with state-sponsored actors targeting critical infrastructure in the United States. These attacks are difficult to detect because they allow attackers to remain present in a system without the user’s knowledge for an extended period. This thesis establishes an initial baseline specifically for Windows operating systems to measure normal system activity, focusing on CPU usage, memory utilization, and process activity. It particularly examines the use of PowerShell alongside other applications. The findings from this baseline are used to …
Ai Enabled Autonomic, Safe, And Interactive Intrusion Response System, Damodar Panigrahi
Ai Enabled Autonomic, Safe, And Interactive Intrusion Response System, Damodar Panigrahi
Theses and Dissertations
The exponential rise in internet usage has precipitated a corresponding surge in cyber threats, underscoring the urgent need for advanced cybersecurity solutions. While traditional intrusion detection systems (IDS) can identify these threats, their inability to self-recover leaves systems vulnerable. Intrusion response systems (IRS) have been developed to address this, aiming to auto- matically restore systems to their desired state post-security breach. However, current IRSs often necessitate manual intervention and may not be su!ciently robust against sophisticated threats. To overcome these limitations, we propose an AI-powered Autonomic, Safe, and Interactive Intrusion Response System called ‘Intrusion Response System Digital Assistant (IRSDA)’. IRSDA …
Faculty Perceptions And Use Of Open Educational Resources In Postsecondary Stem Classrooms, Gabriel Posadas
Faculty Perceptions And Use Of Open Educational Resources In Postsecondary Stem Classrooms, Gabriel Posadas
Theses and Dissertations
This study examined how faculty in Science, Technology, Engineering, and Mathematics (STEM) or STEM-related fields perceive and utilize open educational resources (OER) in their classrooms and how faculty characteristics (e.g., age, teaching experience, OER experience) influence their adoption. A quantitative survey was administered to 48 STEM faculty across 8 colleges at a large, southeastern university. Findings revealed that faculty generally acknowledged OER’s benefits, particularly its cost-saving potential, and all faculty without prior OER experience and 86.5% of faculty with OER experience expressed neutral to positive perceptions regarding OER’s ability to reduce financial burdens. Faculty with OER experience also recognized its …
“Sometimes The World Don’T Give You What You Need”: Black Motherhood And Kinship As Resistance To Necropolitics In Jesmyn Ward’S Bois Sauvage, Hailey N. Reeder
“Sometimes The World Don’T Give You What You Need”: Black Motherhood And Kinship As Resistance To Necropolitics In Jesmyn Ward’S Bois Sauvage, Hailey N. Reeder
Theses and Dissertations
This thesis explores how Black motherhood and kinship serve as subversive forces within necropolitical landscapes in Jesmyn Ward’s Where the Line Bleeds, Salvage the Bones, and Sing, Unburied, Sing. Drawing on Achille Mbembe’s theory of necropolitics, this study examines how the economic and social constraints of these environments disrupt Black family structures, emphasizing the necessity of kinship for survival. In Where the Line Bleeds, Cille’s absence disrupts traditional family roles, yet kinship networks allow the family to endure. In Salvage the Bones, Esch’s journey redefines the “bad” Black teen mother stereotype, highlighting how kinship offers support amidst stigma. In Sing, …