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Articles 4531 - 4560 of 74094
Full-Text Articles in Entire DC Network
The Impact Of Land Use And Land Cover Change On Vegetation, Ecosystem Dynamics, And Conservation In The Northern Great Plains, Seth R. Fore
The Impact Of Land Use And Land Cover Change On Vegetation, Ecosystem Dynamics, And Conservation In The Northern Great Plains, Seth R. Fore
Theses and Dissertations
Land use and land cover change (LULCC) is one of the primary contributors to global biodiversity and habitat loss. Identifying sustainable development strategies requires understanding the social drivers of land use and conservation decisions as well as their impacts on ecological processes. These socio-ecological interconnections were explored in Northern Great Plains region. Results showed that common responses to socio-economic drivers have resulted in widespread loss of grassland areas throughout the region and that shifts in the functional characteristics of plant communities caused by LULCC have significantly altered key ecosystem functions linked to primary production, carbon/nutrient turnover, and water cycling. Expanding …
Psychology Graduate Student Experiences, Social Support, And Mental Health, Kathryn Lang
Psychology Graduate Student Experiences, Social Support, And Mental Health, Kathryn Lang
Theses and Dissertations
Graduate school is a highly stressful experience for many psychology students. Accordingly, graduate psychology programs need to identify and minimize unnecessary sources of stress on their students. Despite the importance of this topic, there is little research on factors that increase psychology graduate students’ stress. The present study determined how a student’s financial difficulties, quality of their social support, quality of their faculty support, number of adverse experiences they had in their program, the impact of a student’s negative experience in their program; and the population size of the location of their program affect a student’s mental health, perceived progress …
Developing Inclusive Practices Through Peer Coaching In College Science Teaching, Briana Miller
Developing Inclusive Practices Through Peer Coaching In College Science Teaching, Briana Miller
Theses and Dissertations
Historically underrepresented students pursuing STEM majors encounter systemic barriers. Students are more likely to experience success when faculty implement inclusive practices. Faculty often lack the pedagogical training necessary to adopt inclusive practices, further perpetuating inequities. To eliminate barriers and offer equitable opportunities for success in STEM majors, this case study explores the implementation of peer coaching and Culturally Relevant Science Teaching (CRST) in college level science teaching, focusing on the experiences of three participating faculty. Through a year-long professional development (PD) cycle, three science faculty members from a small liberal arts college engaged in reflective practices aimed at improving their …
The Reservoir Geomechanics And Production Effects On Permafrost Stability During Polymer Eor, Shane S. Namie
The Reservoir Geomechanics And Production Effects On Permafrost Stability During Polymer Eor, Shane S. Namie
Theses and Dissertations
The North Slope of Alaska (ANS) contains an estimated 40 billion barrels of heavy oil in relatively shallow formations (984 to 1,969 ft / 304 to 600 m) within the Prudhoe Bay Unit (PBU), Milne Point Unit (MPU) and Kuparuk River Unit (KRU). Extracting this resource presents unique challenges, especially when hydrocarbon-bearing zones are near the permafrost. Research on tertiary recovery processes in these shallow zones is limited, with prior studies indicating minor permafrost thawing and subsidence over 30 to 40 years but lacking a numerical simulation model supported by laboratory data.This study investigates the feasibility of an enhanced oil …
Techno-Economic Analysis Of Biogas Utilization In Refuse Power Plants, Marco Hernandez
Techno-Economic Analysis Of Biogas Utilization In Refuse Power Plants, Marco Hernandez
Theses and Dissertations
As the energy industry shifts towards a heavier priority on decreasing the environmental impact caused by power plants, an innovation that repurposes existing coal processing facilities has been in high demand. A Techno-Economic Analysis (TEA) that focuses on transporting and co-firing biogas, a renewable fuel obtainable from landfills or through anaerobic digestion, with waste coal, which is a source of pollution in need of remediation, has been conducted to evaluate the benefits of net-negative carbon emissions. ASPEN Plus V14 simulations were constructed and utilized to aid the process estimation for the proposed power plant designs. The Levelized Cost of Electricity …
Risk Factor Patterns For Elder Abuse Among United States Indigenous Peoples: Native Elder Maltreatment Survey Secondary Data Analysis, Maylynn Riding In
Risk Factor Patterns For Elder Abuse Among United States Indigenous Peoples: Native Elder Maltreatment Survey Secondary Data Analysis, Maylynn Riding In
Theses and Dissertations
Elder abuse is a significant public health issue, with findings indicating that 9% to 10% of older adults in the United States experience abuse. This figure is likely mirrored among Indigenous Peoples residing within tribal boundaries, although specific data is scarce. This study aims to fill the gap in understanding the prevalence and risk factors associated with elder abuse among United States Indigenous Peoples (USIP) through a secondary data analysis of the Native Elder Maltreatment Survey (NEMS). The NEMS employs two key instruments: the Hwalek-Sengstock Elder Abuse Screening Test (HS EAST), which is validated for community use, and the Native …
Analyzing The Effects Of Cloud Seeding On Hail Suppression During The North Dakota Cloud Modification Project, Lynnlee Storm Rosolino
Analyzing The Effects Of Cloud Seeding On Hail Suppression During The North Dakota Cloud Modification Project, Lynnlee Storm Rosolino
Theses and Dissertations
This study assesses the effectiveness of cloud seeding for hail suppression as part of the North Dakota Cloud Modification Project. Using a radar-based hail size retrieval algorithm, storm data from 2016-2018 were analyzed to compare observed hail sizes with forecasted values from atmospheric models and indices. Algorithm output is compared with model proximity sounding analysis including two hail-centric indices, five severe weather indices, and HAILCAST output to determine the forecasted hail size. Results show that the majority of unseeded cases have matching forecasted and observed hailstone diameter. In contrast, in seeded storms, observed hail sizes were consistently smaller than forecasted. …
Investigation Of The Existence Of Vertically Oriented Ice Crystals In Winter Storms, Kendra R. Sand
Investigation Of The Existence Of Vertically Oriented Ice Crystals In Winter Storms, Kendra R. Sand
Theses and Dissertations
The existence of vertically oriented ice crystals is investigated in winter storms, as observed through remote sensing and analyzed during the NASA Earth Venture Investigation of Microphysics and Precipitation for Atlantic Coast-Threatening Snowstorms (IMPACTS) field campaign field campaign. The primary objective was to determine if a preferred angle of ice crystal orientation could be identified in situ using contemporary airborne sampling instruments. Additionally, the study sought to explore potential correlations between the vertical orientation of ice crystals and electric field anomalies at cloud top, as well as the relationship between crystal orientation and particle concentration. To achieve these objectives, Two-Dimensional …
An Analysis Of Curricular Complexity Patterns In Undergraduate Mechanical Engineering Programs Using Federally Reported Data, Shane Schellpfeffer
An Analysis Of Curricular Complexity Patterns In Undergraduate Mechanical Engineering Programs Using Federally Reported Data, Shane Schellpfeffer
Theses and Dissertations
With the recent development of curricular analytics tools designed to quantify the structure of a curriculum (Heileman, Abdallah, et al., 2018), some institutions of higher education are examining their curricula to find ways that these pathways to graduation can be improved (McMurtrie, 2021). The tools used to analyze curricula were created to address an issue of importance in the field of undergraduate engineering, that issue being the decreasing enrollment trend over the past two decades. The decrease in undergraduate engineering graduates in programs across the United States led to conversations in both academia and industry regarding potential solutions for this …
Investigation Of Gas Injection Eor In Conventional And Unconventional Reservoirs Based On Laboratory Experiments And Field Pilot Tests, Jin Zhao
Theses and Dissertations
Currently, fossil fuels (including oil, natural gas, and coal) are still the dominant energy sources in the United States. However, their extraction and utilization generate a significant volume of carbon dioxide (CO2) and associated gases, such as methane (CH4), ethane (C2H6), propane (C3H8), etc. Injecting these gases back into deep oil reservoirs offers a practical means to enhance oil recovery while reducing air pollution. The target formations are usually characterized by good porosity and permeability to ensure sufficient injectivity and storage capacity. However, recent unconventional reservoir development indicated that tight formations could also be potential targets for enhanced oil recovery …
Primary And Secondary Resonances Of Fringe Effect Electrostatically Actuated Mems Cantilever Resonators, Miguel Armando Martinez
Primary And Secondary Resonances Of Fringe Effect Electrostatically Actuated Mems Cantilever Resonators, Miguel Armando Martinez
Theses and Dissertations
The nonlinear dynamics of micro-electromechanical system (MEMS) cantilever resonators actuated by the fringe field at parametric and primary resonances are studied. Three models are used based on different descriptions of the system capacitance. In the fringe and capacitance models, the electrostatic force due to the parallel-plate capacitance is neglected due to a hole in the ground plate (removes overlapping area). The SolidWorks model is based on numerical capacitance simulations performed on SolidWorks using EMS. All three models that approximate the fringe field capacitance are compared with one another. The Method of Multiple Scales (MMS) and Reduced Order Model (ROM) up …
Cries From The Arroyo, Samyra Perez
Cries From The Arroyo, Samyra Perez
Theses and Dissertations
Cries from the Arroyo is a fictional story told from the perspective of the main character Eztli Morales. Eztli derives from a lineage of cursed women, each marked by adversity and loss. The narrative flows between past and present. Her past in her college years, where she tries to escape her cursed legacy through education. While Enrique represents the promise of a normal life, Isandro offers a darker path to defy the Morales curse. The loss of her first pregnancy seems to settle her supernatural debt, but only feeds the generational pattern of suffering. The present revolves around the months …
Cavernous Distortions, Silas Samuel Quintanilla
Cavernous Distortions, Silas Samuel Quintanilla
Theses and Dissertations
This is a collection of short stories in the style of surreal fiction. They are stories about outsiders, powerlessness, communication, isolation, longing, death, and existentialism. They follow in the tradition of parables, fables, and in the shadow of surrealist masters like Franz Kafka.
The Effects Of Livestock On Mosquito Diversity And Abundance In Hidalgo County, Taylor Nicole Moya
The Effects Of Livestock On Mosquito Diversity And Abundance In Hidalgo County, Taylor Nicole Moya
Theses and Dissertations
Mosquitoes are detrimental to animals and threaten humans. More information is needed on how farm animal presence may impact mosquito abundance and diversity at farms. My goal in this study is to determine if there is any correlation between animal abundance or diversity on a farm and the abundance and diversity of mosquitoes collected. Hidalgo County, Texas, has a subtropical desert climate, ideal for mosquitoes. I hypothesized that the mosquito abundance and diversity indices would increase as the livestock abundance or diversity increases. Adult mosquitoes were collected using two CO2-baited light traps per farm from Spring 2022 to Fall 2022. …
Understanding The Influence Of Traffic And Noise On The Wildlife Community Surrounding Fm106 And Sh100 In South Texas, Anna Rose Mehner
Understanding The Influence Of Traffic And Noise On The Wildlife Community Surrounding Fm106 And Sh100 In South Texas, Anna Rose Mehner
Theses and Dissertations
In South Texas, highways create landscape fragmentation, habitat degradation, and result in wildlife vehicle collisions. Vehicle collisions are the highest known cause of mortality of the endangered ocelot (Leopardus pardalis), which led Texas Department of Transportation to install nine wildlife crossing structures (WCS) on Farm-to-Market 106 and five on State Highway 100. These highways are along Laguna Atascosa National Wildlife Refuge, which is the location of the southernmost breeding population of ocelots in the United States. Many other wildlife species including bobcat (Lynx rufus) and coyote (Canis latrans), are present along these highways and …
Structure Modifications And Alternative Monitoring Designs Of Wildlife Road Mitigation Structures, Madison T. Nadler
Structure Modifications And Alternative Monitoring Designs Of Wildlife Road Mitigation Structures, Madison T. Nadler
Theses and Dissertations
Wildlife mitigation structures are designed to keep animals off roadways while providing them safe passage to the other side and not impeding traffic flow. Camera traps are commonly used to assess the success of these mitigation structures, but there are downfalls to both the methods and structures. Alternative mitigation structure designs are needed to better prevent wildlife from accessing roadways in areas where they should be deterred. Additionally, traditional camera trapping methods do not accurately capture the full wildlife communities that may be utilizing these structures and other survey methods are needed, specifically aimed at small mammals, amphibians, and reptiles. …
Effects Of Metoprolol And Propranolol Beta-Blockers Mixture On Morphological And Physiological Responses In The American Oyster, Andrew Salinas
Effects Of Metoprolol And Propranolol Beta-Blockers Mixture On Morphological And Physiological Responses In The American Oyster, Andrew Salinas
Theses and Dissertations
Beta-blockers are extensively used to treat human cardiovascular conditions yet pose significant risks to non-target aquatic organisms. This study aimed to investigate the effects of short-term exposure (one week) to a beta-blocker’s mixture (low-dose: 50 ng/L propranolol and 250 ng/L metoprolol, and high-dose: 250 ng/L propranolol and 650 ng/L metoprolol) in the American oysters. Histopathological assessments revealed structural damage to gills, connective tissues, and digestive glands in both low- and high-dose treatment groups. Additionally, glucose concentration and pH of the extrapallial fluid significantly declined in the high-dose treatment group. Hemocyte density within connective tissues increased proportionally with dosage. The beta-blocker …
Tc-Ptp-Mediated Regulation Of P38 Mapk Pathway Promotes Uvb-Induced Apoptosis In Skin, Lindsey Susie Shim
Tc-Ptp-Mediated Regulation Of P38 Mapk Pathway Promotes Uvb-Induced Apoptosis In Skin, Lindsey Susie Shim
Theses and Dissertations
T-cell protein tyrosine phosphatase (TC-PTP) is a non-receptor PTP that has been shown to have various roles in signaling pathways. Our previous studies have demonstrated that the TC-PTP deficiency in the epidermis can exacerbate hyperplastic response by inducing epidermal cell proliferation in response to tumor promoter TPA or UVB exposure. This implies that TC-PTP plays a tumor-suppressive role in the epidermis and provides protection against UVB radiation, which is well known to contribute to skin cancer development. The p38 mitogen-activated protein kinase (MAPK) is one of serine/threonine kinases that are activated through environmental stress including UVB. It has been demonstrated …
Technical Potential And Challenges For Agrivoltaic Development In Nigeria, Ifeoluwa Ezekiel Babarinde
Technical Potential And Challenges For Agrivoltaic Development In Nigeria, Ifeoluwa Ezekiel Babarinde
Theses and Dissertations
The co-location of agriculture and solar photovoltaic (PV) infrastructure, known as agrivoltaics, is an increasingly popular practice that offers co-benefits like reduced plant drought stress and improved yields of shade-tolerant crops, particularly in water-scarce agricultural regions. Despite its global growth, knowledge on the technical potential, opportunities, and challenges for agrivoltaic development remains limited in the Global South. Here we address this knowledge gap for Nigeria, Africa’s most populous country, by identifying high-potential regions based on the premise that agrivoltaic co-benefits are generally most pronounced in arable lands with both high solar irradiation and water stress. We find that northern regions, …
Guiding Wildlife: Evaluating Wildlife Exit Designs And Sensor Lights For Safer Highways In South Texas, Rupesh Maharjan
Guiding Wildlife: Evaluating Wildlife Exit Designs And Sensor Lights For Safer Highways In South Texas, Rupesh Maharjan
Theses and Dissertations
Roadside exclusionary fencing is more prevalent on highways to prevent wildlife-vehicle collisions. Although it can mitigate wildlife road mortality by limiting their access to the road, it can also create a barrier for wildlife stranded within the right-of-way. In State Highway 100 of Texas, the Texas Department of Transportation installed ten wildlife exits to allow wildlife to escape the fenced roadway, and a pair of sensor lights on 13 wildlife guards (WGs) to scare off target species (bobcats and coyotes) from crossing the guards and accessing the roadway. In this study, the effectiveness of three wildlife exit (WE) designs were …
Effect Of An Anti-Hiv Polymer Based Nanoformulation On Immune Mediating Cells Within The Gut Associated Lymphoid Tissue And Its Behavioural Impacts, Blessed Ofori
Theses and Dissertations
This thesis investigates the therapeutic potential of nanoformulated antiretroviral therapy (NF cART) and its implications for HIV-associated chronic inflammation and neurobehavioral outcomes. In the first study, NF cART demonstrated enhanced efficacy in modulating inflammasome activation and reducing viral reservoirs in gut-associated lymphoid tissue (GALT) and the small intestine of HIV-infected humanized mice. Key markers of inflammation (NLRP3, Caspase-1, and IL-1β) and viral replication (LTR and p24 levels) were significantly suppressed with NF cART compared to conventional therapy, though residual LTR expression persisted in the small intestine. In the second study, nanoformulated Emtricitabine uniquely enhanced locomotor activity and reduced anxiety-like behaviors …
Implementing Organic Fertilization Practices To Improve Aloe Vera Growth And Soil Health In The Lower Rio Grande Valley, Isaiah Edward Jaramillo
Implementing Organic Fertilization Practices To Improve Aloe Vera Growth And Soil Health In The Lower Rio Grande Valley, Isaiah Edward Jaramillo
Theses and Dissertations
Aloe vera (L.) (Aloe) Burm. f., is valued for its applications across the cosmetic, medicinal, and food industries due to its leaf gel. In the aloe industry, the extraction of gel from leaves generates significant quantities of organic waste, which presents an opportunity to repurpose this material as an amendment in aloe cultivation. While Aloe is renowned for its resilience, understanding the feasibility of using these organic shavings as a soil fertility amendment in aloe production is critical. This research aims to identify sustainable fertilization methods for Aloe that can maintain and/or improve crop yield while enhancing soil health. This …
Proof Of Concept: Simulating Drone Tracking In A Border Security Context, Jose Ruben Espinoza
Proof Of Concept: Simulating Drone Tracking In A Border Security Context, Jose Ruben Espinoza
Theses and Dissertations
Worldwide availability of drone technology has risen to unprecedented levels within the past century due to its commercial availability. While there has been various positive applications of such technology, it has additionally found usage within security critical contexts. Specifically, there have been reports of illegal drug smuggling along the Mexico-United States border in which quadrocopter based drones have been used. Within our research we aim to showcase, as a proof of concept, that autonomous drone technology can be leveraged within a defensive approach via the usage of reinforcement learning and object detection for security critical contexts. To promote the importance …
The Heroine Among Us: An Analysis Of The Feminine Principle Of The Heroine Archetype In Motion Pictures And Its Implication For Social Discourse, Neldie Gonzales
The Heroine Among Us: An Analysis Of The Feminine Principle Of The Heroine Archetype In Motion Pictures And Its Implication For Social Discourse, Neldie Gonzales
Theses and Dissertations
This thesis explores an emerging myth perceived by the rise of the feminine principle in modern society that challenges traditional gender roles. It forms a connection between the heroines seen in film and those in the real-world. It explains how the characteristics of unity, equality and love align to the feminine principle, the acquisition of which defines the archetypal hero along the hero’s journey as described by Joseph Campbell. This work proposes that stories containing this kind of archetypal hero are seeded by the discourse occurring in real-world society. Conversely, it suggests that when viewed by billions of people, blockbuster …
A Nursery Study Of The Interplay Between Soil Texture, Rooting Space, And Nurse Plants On Seedling Growth And Root Development In Woody Species Of Tamaulipan Thornscrub, Lance I. Santos
Theses and Dissertations
Reforestation attempts in semi-arid regions are plagued with seedling mortality. Blanket greenhouse practices may not be optimal, in addition, commensalism interactions between nurse plants are considered. To better understand the effects of soil texture and nurse plant interactions on growth and drought tolerance, two experiments were developed. For soil texture, Border palo verde seedlings were grown in different-sized plant bands with three soil types. To observe the effects of nurse plants, an experiment using guayacan, was developed using Texas Ebony, as a leguminous nurse plant. Plants were also exposed to a drought experiment. The results suggest that some soil textures …
Evaluation Of Polymerization Condition Reactions Of Methyl Vinyl Ketone For Hydrogen Storage, Rituborna Ghosh
Evaluation Of Polymerization Condition Reactions Of Methyl Vinyl Ketone For Hydrogen Storage, Rituborna Ghosh
Theses and Dissertations
Hydrogen is widely regarded as one of the most promising clean alternative fuel sources; however, its widespread adoption has been hindered by significant challenges related to storage and transportation. Various storage methods have been proposed and developed, with continuous advancements being made to address these issues. Among the most effective solutions is the utilization of polymers, which serve as safe and efficient hydrogen storage media. This work investigated the polymerization of methyl vinyl ketone using different ratio of monomer: initiator and monomer: crosslinker using N,N′-methylenebisacrylamide (MBA) as crosslinker and ammonium persulfate (APS) as initiator in a free radical polymerization mechanism. …
Differential Effects Of Workplace Readiness Training And Job Placement Services Provided By Vocational Rehabilitation Vs School Transition Programs: A Retrospective Study Of Young Hispanic Adults, Ashley Laura Wheeler
Differential Effects Of Workplace Readiness Training And Job Placement Services Provided By Vocational Rehabilitation Vs School Transition Programs: A Retrospective Study Of Young Hispanic Adults, Ashley Laura Wheeler
Theses and Dissertations
This ex-post facto study, “Differential Effects of Workplace Readiness Training and Job Placement Services Provided by Vocational Rehabilitation vs. School Transition Programs: A Retrospective Study of Young Hispanic Adults” investigates differential effects of workplace readiness training and job placement services provided by vocational rehabilitation versus local education agency on employment outcomes for young, Hispanic, transition-aged youth with Autism or Intellectual Disabilities. The study examines sustained employment and differences in employment rates for individuals aged 18-23 who participated in work-based learning experiences with job coaches through VR or an LEA. Participants include 30 TAY with Autism and Intellectual Disabilities who exited …
Thank You For Your Service, Dwayne Vega
Thank You For Your Service, Dwayne Vega
Theses and Dissertations
This thesis offers an intimate exploration of my experiences as a soldier during two deployments to Iraq, describing everyday realities of military life. Rather than glorifying the battlefield with warrior myths, I focus on the emotional toll, survival, and the complex relationships among soldiers. My narrative traces the gradual development of PTSD and my eventual reliance on drugs and alcohol as a coping mechanism. Through this personal lens, the thesis seeks to challenge common misconceptions about the soldier's life, offering a raw and authentic portrayal of service, trauma, and the lasting effects it had on my life.
Theoretical Insights And Analysis Into Luneburg Lens, Aram Flores
Theoretical Insights And Analysis Into Luneburg Lens, Aram Flores
Theses and Dissertations
Advancements in wireless communications necessitate innovative antenna designs for radar systems and satellite communications. The Luneburg lens, theorized by Rudolf Luneburg in 1944, is a gradient-index lens capable of focusing electromagnetic waves onto a point on its surface, offering potential improvements in antenna gain and performance. Access to the lenses, courtesy of Assured Space Access Incorporated, enabled me to research the lenses response, and specific design details remain confidential. Practical assessments of 3D-printed Luneburg lenses of varying sizes are limited, including factors such as lens alignment and focal point offset. This study investigates the performance of 6-inch and 13.25-inch Luneburg …
Investigating The Role Of The Estrous Cycle On Memory In Syrian Hamsters, Laura Emma Garcia
Investigating The Role Of The Estrous Cycle On Memory In Syrian Hamsters, Laura Emma Garcia
Theses and Dissertations
The female reproductive system plays a significant role in cognitive function in humans and animals. For this reason, it is important to study the estrous cycle and memory in the female Syrian hamster as a model to better understand its role on cognition. Like the human female menstrual cycle, the female hamster has inconsistencies and changes in their cycles as they age. Irregular menstrual cycles and the absence of estrogen, the sex hormone necessary for supporting the sexual and reproductive health of a woman, also affect a woman’s brain, including memory (John Hopkins Medicine, 2022). In the present study, we …