Digital Commons Network^™

Supercritical Co2 Recompression Closed Brayton Cycle Analysis, Andres Eduardo Gutierrez Hernandez

Open Access Theses & Dissertations

On this research, the results of an analysis made of a Supercritical Carbon Dioxide (sCO2) Recuperated Closed Brayton Cycle (RCBC) done by performing theorical calculations and comparing it to the results obtained with the use of the software ASPEN Plus will be presented. To demonstrate and determine that this software is a useful tool for modeling the proposed type of cycle, a preliminary comparison was made to verify with previous studies found in literature. A comparison and analysis between the possible working fluids and thermal energy sources was also performed to emphasize the decision of using CO2 as the cycle …

Global Analysis Of The Hydrologic Sensitivity To Climate Variability, Marisol Dominguez

Open Access Theses & Dissertations

Identifying the regions with greatest changes in their hydrologic behavior under extreme weather events in the 21st century, constitutes a study priority of global impact. Here, we present a global assessment assessing the sensitivity of the world’s water landscapes to climate variability during 2001-2016, using a new metric called the Hydrologic Sensitivity Index (HSi). This equation is based on the well-known Budyko curve that uses annual values of Potential and Actual Evapotranspiration (PET and AET), and Precipitation (P), to assess the hydrologic behavior of a location under a given climatic condition by plotting the Evaporative Index (AET/P) against the Dryness …

Impact Of Xenobiotics On Neuronal Outcomes, Gabriela Henriquez

Open Access Theses & Dissertations

Neurodegenerative diseases are a common affliction of the Central Nervous System. They are caused by age, genetics, and environmental factors. Alzheimer's disease, Parkinson's disease, Huntington's disease, and Amyotrophic Lateral Sclerosis are well-known among the host of neurodegenerative disorders, with Alzheimer's disease and Parkinson's disease being the leading pathologies across this canvas. It is known that the pathogenesis of neurodegenerative diseases is multifactorial due to the involvement of genetic mutations, radical-induced protein damage, abnormal aggregation of misfolded proteins, and the formation of amyloid deposits. The amyloid proteins in neurodegenerative disease include Tau and Amyloid (Aβ) in Alzheimer's disease and α-Synuclein in …

Environmental Justice Issues And Sea Level Rise In Frontline Communties Along The Gulf Coast, Karla Michel Lopez

Open Access Theses & Dissertations

Sea level rise poses a great threat to coastal areas and our way of life. As flooding increases in frequency and intensity across the country, vulnerable populations become a target to its impacts. The U.S. dedicates much research to risk communication and climate change adaptation strategies; however, these coastal areas are home to a large percentage of underserved and underrepresented communities that can be challenging to meaningfully engage. The impacts of short-term sea level rise combined with long-term sea level rise will not only cause flooding, erosion, and intrusion of saltwater into freshwater resources but also increased financial consequences, such …

Student Attitudes Toward Science: Growth Trajectories And Thematic Analysis Of A Project-Based Internship, Robert Donavin Mccreary

Open Access Theses & Dissertations

In order to increase the number of students pursuing science-related careers, science educators and policymakers have advocated for improving student attitudes toward science (SAS) through inquiry-based instruction, such as project-based learning (PBL). While challenges exist in PBL, research suggests cogenerative dialogue (cogen) can ease the transition for students from traditional learning to PBL. In the present study, a secondary analysis was conducted to examine SAS growth trajectories from participants of the Work With A Scientist Program (WWASP) – a student-scientist internship which integrated cogen with PBL. Additionally, a thematic analysis was conducted to explore student attitudes toward cogen. The growth …

Study Of Barrier Heights And Magnetic Property Using Locally Scaled And Perdew-Zunger Self-Interaction Methods, Prakash Mishra

Open Access Theses & Dissertations

Kohn-Sham density functional theory is a widely used method to estimate the ground state total energies and densities of interacting correlated electronic structures of atoms, molecules, clusters, solids, and liquids. In theory, exact solutions for these properties can be obtained by solving self-consistent one-electron Schrodinger equations based on density functionals for the energy.The practical application of KS DFT require approximation to the exchange-correlation energy functional. Many density functional approximations (DFAs) have been developed with various degree of sophistication and complexity by the satisfaction of exact constraints. Depending on the complexity, these functionals include electron density, density gradients, density Laplacian, kinetic …

Goes-16 Level 2 Land Surface Temperature Product-Filling For Cloud Masked Data, Guadalupe Ortega

Open Access Theses & Dissertations

The GOES-16 satellite ground segment team develops different levels of environmental products and makes them readily available to the public. The level 2 Land Surface Temperature (LST) product aims to provide a remote measurement of the Earth’s surface temperature every hour. LST is of fundamental importance to many aspects of the geosciences, for example, to study the Urban Heat Islands (UHI) effect. The product however, does not provide values for pixels where the satellite imager’s view is obstructed by clouds, as determined by a cloud mask intermediate product. The objective of this thesis is to estimate LST in the cloud …

Demystifying The Practices Of Software Design And The Impact On Codebase Quality And Sustainability, Khandoker Rahad

Open Access Theses & Dissertations

Software systems continue to increase in size and complexity to match the ever-increasing user expectations. Designing and engineering such complex software systems brings about unique challenges. Complex systems are not only expensive to develop, but even more expensive to maintain. Most software systems must adapt to continuously changing business contexts and requirements. In the process, software accumulates arbitrary complexities making its maintenance even more challenging. Design and modeling are the primary methodologies to develop reliable, sustainable, maintainable systems. The development of novel design languages, tools, and methodologies is frequently not able to keep up with the exponential increase in software …

8th Position Bodipy Chemistry, Laura I. Saucedo

Open Access Theses & Dissertations

The projects examined in this dissertation demonstrate how the meso substituents N and S lone pair-BODIPY core interaction influence the chemistry and properties of BODIPY fluorophores. Three objectives were completed experimentally and computationally. In the first project the meso amide substituent delocalizes the nitrogen lone pair into the carbonyl, preventing a hemicyanine resonance that causes blue emission in 8-amino-BODIPYs. The second and third projects substituting aniline or phenylthiol derivatives onto the 8th position, respectively. The aniline and phenylthio lone pair interaction with the BODIPY core can be modulated by electron-donating (ED) or –withdrawing (EW) moieties placed para on the aryl …

Identification And Evaluation Of Critical Transportation Infrastructure Resilience After Hydro-Meteorological Event, Herman Serrato

Open Access Theses & Dissertations

Modern civilization is dependent on essential infrastructure assets that allow society to function in today’s standards. Critical interdependent infrastructure such as transportation, communication, security, and public health are marvels of human innovation and an important aspect of civilization's evolution. Recent world events such as climate change have underlined the necessity to develop strategic plans to enhance the resilience of infrastructure. This study aimed to identify and evaluate the flooding potential of critical transportation infrastructure that will influence traffic flow and impact the economy. The technical workflow is based on observations, predictions, experiments, testing, and analysis to derive a resilience score …

Transboundary Air Quality Governance: A Case Study Of The Paso Del Norte Air Basin 1940-2000, Laura Margarita Uribarri

Open Access Theses & Dissertations

For thousands of years, the Paso del Norte region which today includes Ciudad Juárez, Chihuahua, El Paso, Texas, and Sunland Park, New Mexico, has been a strategic location by virtue of its geographic positioning at the lowest and easiest passage across the continental divide. During the 19th and 20th centuries as railroad networks connected the region to the far reaches of the U.S. and the interior of Mexico, it became a nexus for natural resource and labor extraction. Mining and smelting industries were later joined by agriculture and manufacturing to benefit from the transportation network and the abundance of labor. …

Measurement Of Radon Gas At Kilbourne Hole, Michel Eduardo Luna Lucero

Open Access Theses & Dissertations

Several radon studies have reported a possible correlation of the gas emanation with faults and seismic activity in the area, but few studies have been conducted in seismically inactive areas. Features such as the Kilbourne Hole in New Mexico, a maar volcano formed by an interaction between magma and water, can reveal important information about connection between radon concentration levels and structural geology.

The purpose of this thesis is to determine the radon concentration levels in and around the crater of the Kilbourne Hole. The results are compared with geological, gravity and magnetic surveys to have a better understanding of …

Essays Related To Water Transfer And Water Sharing: The Past And The Present, Arpita Nehra

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This dissertation explores the impacts of resource procurement on economic growth and urbanization in a county through a historical case study, moving on to discuss the welfare impacts of resource-sharing in two regions. The first two essays explore the impact of the Owens Valley water transfer in the 1900s on the urban sprawl and the economic growth of Los Angeles. The main contribution that the first two essays make is to present an empirical analysis on the impact of procurement of resources on the economy. The third essay examines the welfare impacts of a proposed water sharing and development project. …

Characteristic Of The Dynamics Of Disorder In Crystalline And Amorphous Materials, Amir Behbahanian

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This work provides the evidence to apply simulation methods that are applicable to systems with structural randomness to simulate crystalline materials at high temperatures. My work not only open the avenue to expand the simulation capability of materials but also provides insight to the physics of vibrations of atoms under different temperature and for different types of materials. I have also evaluated the reliability of Molecular Dynamics simulations at the frequency level and found that theses types of simulations, despite the previous belief, are reliable at low temperatures but up to a measurable frequency. In addition, the result of my …

Absolute Neutral Densities And Temperatures And Their Climatologies In The Middle Atmosphere Using An Optimal Estimation Method With Rayleigh-Scatter Lidar Observations Obtained At Utah State University, Jonathan L. Price

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Earth’s atmosphere is comprised of layers which can be defined by their temperature characteristics. These layers are the troposphere, stratosphere, mesosphere and thermosphere. The region where life exists is in the troposphere, however the study of the layers above is important as changes in these regions can directly impact, or indicate significant changes in, weather in the troposphere. The mesosphere is the least well-known region because it is the most difficult to observe. One of the best tools for observing this region is the Rayleigh-scatter lidar. It is capable of remotely observing the entirety of the mesosphere with good …

High-Magnification Digital Image Correlation Techniques For Aged Nuclear Fuel Cladding Testing, Robert Scott Hansen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Nuclear fuel cladding in light water reactors, often made of zirconium alloys, is naturally made more brittle by exposure to the water coolant during normal reactor operation. However, this embrittlement by zirconium hydrides changes the mechanical behavior of the cladding material, affecting how it will deform and what may cause it to fail. Because the cladding already has different properties in different material directions, mechanical testing also needs to be direction specific. In addition, to understand the effects that these microscale hydride features have, measurements of deforming cladding need to be at a microscale. This dissertation describes several high-magnification innovations …

Candidate Ideology And Small Donor Contributions, Ryan Kobe

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

While individual citizens are the biggest source of campaign fundraising in Senate and House elections, previous research has focused on individuals donating over the reporting limit of $200. The Federal Elections Committee now makes available data on individuals who donate less than $200, and as these donors take on a bigger role in congressional fundraising, a new analysis of donor motivations is needed. This thesis investigates if and how candidate ideology is related to amount contributed. Specifically, I ask whether the dollar amount of contributions changes depending on how conservative or liberal a candidate is. These results have important implications …

Peer-To-Peer Feedback: An Instructional Strategy In Teacher Evaluation, Brady L. Ridge

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Over the last several decades there have been federal movements in education which place more accountability on schools and consequently their principals. Principals have many responsibilities which vary from administrative duties to improving teaching in their schools. As a result, principals are often asked to do more than they believe they have time to accomplish. Peer-to-peer feedback is a practice that principals can use to help evaluate, and more importantly, help teachers improve their teachers' teaching. This multi-case or multi-school qualitative study researched the practice of peer-to-peer feedback at two elementary schools. The purpose was to understand how peer-to-peer feedback …

Examining Segregation Between Chinese And Euroamerican Residences Using Suitability Modeling Within The Built Environment At Terrace, Utah: A Case Study, Kelly N. Jimenez

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Suitability modeling is a useful approach for exploring human interactions with their environments. Within a geographic information system (GIS) environment, locations are weighted relative to each other, resulting in a landscape hierarchy that displays regions from least to most suitable. Suitability modeling is used in various disciplines, from urban planning to natural resources, but a gap exists in research concerning social human behavior. This method can especially contribute to the investigation of social inequality at archaeological sites by considering multiple attributes within a site. In this thesis, I use method to determine social inequality between cultural groups at the historic …

A New Algorithm For Robust Affine-Invariant Clustering, Andrews Tawiah Anum

Open Access Theses & Dissertations

Cluster analysis is an unsupervised machine learning technique commonly employed to partition a dataset into distinct categories referred to as clusters. The k-means algorithm is a prominent distance-based clustering method. Despite its overwhelming popularity, the algorithm is not invariant under non-singular linear transformations and is not robust, i.e., can be unduly influenced by outliers. To address these deficiencies, we propose an alternative clustering procedure based on minimizing a “trimmed” variant of the negative log-likelihood function. We develop a “concentration step”, vaguely reminiscent of the classical Lloyd’s algorithm, that can iteratively reduce the objective function. Multiple real and synthetic datasets are …

Racial Diversity Of Texas School Teachers, Julie Ann Olguin-Phillips

Electronic Theses and Dissertations

There is a growing gap between the racial demographics of public-school teachers and their students. Teachers with demographic backgrounds similar to a school’s student population are often successful, particularly in Title 1 schools with high proportions of minority students; however, teacher turnover is high. The students in Texas public schools are a growing minority-majority population. Changes in the student body racial composition and other school-related variables could influence teacher workforce demographics. The focus of discussion of this quantitative research study is to determine the factors that predict the racial diversity of teachers in Texas high schools. The research questions addressed …

Two-Way Load Flow Analysis Using Newton-Raphson And Neural Network Methods, Aya Emad Omar Al Shaltouni

Theses

This research presents a study of the optimal power flow for networked microgrids with multiple renewable energy sources (PV panels and wind turbines), storage systems, generators, and load. The OPF problem is performed using a conventional method and an Artificial Intelligence method. In this research, we investigated the performance of MGs system with renewable energy integration with focus on power flow studies. The calculation of the power flow is based on the well-known Newton-Raphson method and Neural Network method. The power flow calculation aims to evaluate the grid performance parameters such as voltage bus magnitude, angle, real and reactive power …

Panimulang Pagsusuri Sa Gamit Ng Tabletop Game Na Isabuhay Bilang Estratehiya Sa Pagtutura Ng Wika, Mariyel Hiyas Concha Liwanag

Journal Article

This paper evaluated the tabletop game Isabuhay as a strategy for teaching language in college level. The first part of the paper discusses the concept of game-based learning and its examples in different disciplines. This is followed by the discussion of the experiences of the students and the teacher in using the game as part of their class. Lastly, the game was evaluated using the principles of game-based learning by James Paul Gee. In the evaluation, the game was able to follow the principles of "empowered learner" and the creation of space for problem-solving and understanding, however, there are parts …

Law Library Blog (December 2021): Legal Beagle's Blog Archive, Roger Williams University School Of Law

Law Library Newsletters/Blog

No abstract provided.

Envisioning A Legal Framework For Outer Space Cultural Heritage, Lucas Lixinski, M. M. Losier, Hannah Schreiber

Journal of Space Law

No abstract provided.

Achievement Growth In K-8 Catholic Schools Using Nwea Data, Julie W. Dallavis, Megan Kuhfeld, Beth Tarasawa, Stephen Ponisciak

Journal of Catholic Education

Using a national sample of kindergarten to eighth grade students from Catholic and public schools who took MAP Growth assessments, we examine achievement growth over time between sectors. Our findings suggest that while Catholic school students score higher in math and reading than public school students on average, they also enter each school year at a higher level. Public school students close this gap to some degree during the school year. Additionally, these patterns varied by age and subject. Catholic school students in the earlier grades show less growth in both reading and math during the academic year compared to …

The Predictability Of Selected Academic Demographic And Family Related Factors On The Academic Achievement Of Middle School Students., Demetria Westmoreland

Dissertations (2016-Present)

The purpose of this study was to examine the relationship and predictability of selected demographic, academic and family related factors on the academic performance of middle school students. Specifically, this study will be concerned with the predictability of the variables gender, ethnicity, standardized mathematics scores, standardized reading scores, family income, type of household, socioeconomic status and primary language spoken in the home on the academic performance of middle school students as measured by their STAAR’s social studies scores. A quantitative correlational research design was employed in the current investigation. A linear relationship was not found between the demographic factors of …

The Impact Of Selective Cognitive And Non-Cognitive Factors On Academic Performance And Persistence Rate Of First-Year College Students: Implications For Counseling., Tanya Sharneek Jones

Dissertations (2016-Present)

The issue of first-year college students academic performance and persistence rate has recently become a focal point for policy discussions because researchers, administrators, counselors, and policymakers are increasingly interested in understanding why some students succeed while others fail. To help incoming freshmen accomplish their academic and career goals, college and universities must gain the necessary insight on how to retain these students and assist them in matriculating on their campuses. Selective cognitive and non-cognitive characteristics associated with incoming freshmen will have a significant impact on them remaining in school and graduating. The purpose of this study was to examine the …

Irreversibility Minimization Analysis Of Ferromagnetic Oldroyd-B Nanofluid Flow Under The Influence Of A Magnetic Dipole, Muhammad Ramzan, Fares Howari, Jae Dong Chung, Seifedine Kadry, Yu Ming Chu

All Works

© 2021, The Author(s). Studies highlighting nanoparticles suspensions and flow attributes in the context of their application are the subject of current research. In particular, the utilization of these materials in biomedical rheological models has gained great attention. Magneto nanoparticles have a decisive role in the ferrofluid flows to regulate their viscoelastic physiognomies. Having such substantial interest in the flow of ferrofluids our objective is to elaborate the melting heat transfer impact in a stretched Oldroyd-B flow owing to a magnetic dipole in the presence of entropy generation optimization. Buongiorno nanofluid model expounding thermophoretic and Brownian features are considered. Moreover, …

Ferris Bakes, Ferris Dehart

Honors Capstones

No abstract provided.