Digital Commons Network^™

Investigation Of Recrosslinkable Preformed Particle Gels For Natural Gas Conformance Control, Ali Abdulmohsen Al Brahim

Doctoral Dissertations

"Recross linkable Preformed Particle Gel (RPPG) is a novel type of preformed particle gel in which particles can bond together to form a strong bulk gel system after being placed in the target formation. In this research, I systematically evaluated the feasibility of using this product to improve gas flooding conformance for mature reservoirs with conduits or fractures. Two RPPG systems were used for the experiment: a CO₂- resistant RPPG (CR-RPPG) synthesized using acrylamide (AM) and 2-acrylamide-2- methylpropane sulfonate acid (AMPS), designed for CO2 flooding; and an acrylamide-co-acrylic acid-based RPPG (LT-RPPG), designed for water flooding. Different experimental apparatuses …

Sustainable Development: A Data Analysis Investigation For A New Conceptual Model, Case Study Comparison And Validation Techniques, Tiffanie Marie Toles

Doctoral Dissertations

"The three pillars model for sustainability, often represented with three intersecting circles described as economic, environmental, and social factors with sustainability being at the center is a complex and philosophically open model [1]. As society promotes efforts to reduce carbon impacts, there becomes a need to critically review the models employed for understanding. This research presents a validated methodology, an updated conceptual configuration of sustainability for overall use, as well as a sustainable development performance measurement system. Using the 2020 Sustainable Development Goals Index Data, 232 indicators from 193 countries were used to evaluate the efficacy of using more than …

Identification, Mapping, Analysis, And Dating Of Composite Mega Landslides In The Colorado Plateau, Conor Maris Watkins

Doctoral Dissertations

"This research consists of three articles focusing on landslide complexes within the Grand Canyon region of the Colorado Plateau. This is a vast and remote region of rugged topography. The landslide complexes in this study are greater than 10 million cubic meters in volume. The slides are located within different areas of the region and consist of differing geology but share multiple commonalities. Stratigraphic and structural controls tend to dictate where the slides occur. All of the landslides occur where carbonates and/or sandstones overlie over consolidated shales. The shales are susceptible to creep and strain softening where lateral confinement has …

Unsteady Flow Behaviors Generated By Three-Dimensional Lattice Geometries As Measured By Laser Doppler Velocimetry, Yi Qiao

Doctoral Dissertations

"The relation between flow stream turbulence and heat transfer has been known for a long time, that the heat transfer rate is increased if the turbulence or fluctuation level of the flow increases. Open cell foams and compact heat exchangers are two of the most common models applied for heat transfer augmentation. However, the small ligaments of open cell foams limit the heat conducted and smooth passages in compact heat exchangers cannot cause flow unsteadiness. Accordingly, new geometric models are needed to improve the heat transfer enhancement. Three-dimensional (3D) lattice geometries with a range of features and sizes can be …

Efficient High Order Ensemble For Fluid Flow, John Carter

Doctoral Dissertations

"This thesis proposes efficient ensemble-based algorithms for solving the full and reduced Magnetohydrodynamics (MHD) equations. The proposed ensemble methods require solving only one linear system with multiple right-hand sides for different realizations, reducing computational cost and simulation time. Four algorithms utilize a Generalized Positive Auxiliary Variable (GPAV) approach and are demonstrated to be second-order accurate and unconditionally stable with respect to the system energy through comprehensive stability analyses and error tests. Two algorithms make use of Artificial Compressibility (AC) to update pressure and a solenoidal constraint for the magnetic field. Numerical simulations are provided to illustrate theoretical results and demonstrate …

Advances In Differentially Methylated Region Detection And Cure Survival Models, Daniel Ahmed Alhassan

Doctoral Dissertations

"This dissertation focuses on two areas of statistics: DNA methylation and survival analysis. The first part of the dissertation pertains to the detection of differentially methylated regions in the human genome. The varying distribution of gaps between succeeding genomic locations, which are represented on the microarray used to quantify methylation, makes it challenging to identify regions that have differential methylation. This emphasizes the need to properly account for the correlation in methylation shared by nearby locations within a specific genomic distance. In this work, a normalized kernel-weighted statistic is proposed to obtain an optimal amount of "information" from neighboring locations …

Essays On Conditional Heteroscedastic Time Series Models With Asymmetry, Long Memory, And Structural Changes, K C M R Anjana Bandara Yatawara

Doctoral Dissertations

"The volatility of asset returns is usually time-varying, necessitating the introduction of models with a conditional heteroskedastic variance structure. In this dissertation, several existing formulations, motivated by the Generalized Autoregressive Conditional Heteroskedastic (GARCH) type models, are further generalized to accommodate more dynamic features of asset returns such as asymmetry, long memory, and structural breaks. First, we introduce a hybrid structure that combines short-memory asymmetric Glosten, Jagannathan, and Runkle (GJR) formulation and the long-memory fractionally integrated GARCH (FIGARCH) process for modeling financial volatility. This formulation not only can model volatility clusters and capture asymmetry but also considers the characteristic of long …

Design, Modeling And Analysis Of An Ac-Ac Dual Active Bridge Converter, Kartikeya Jayadurga Prasad Veeramraju

Doctoral Dissertations

"The Solid-State Transformer (SST) is gaining attention as an alternative to conventional iron-core transformers in the power electronic community. The power industry's increasing demands for smaller size, higher efficiency, and greater energy density have made the SST an attractive option. Among various power electronic converter topologies, the Dual Active Bridge (DAB) has become popular for its bidirectional power flow capability and galvanic isolation, primarily in the DC application space. Advancements in semiconductor technologies have introduced new bidirectional switches, opening avenues for novel SST topologies. This research investigates the application of the DAB as a single-stage SST and focuses on advancements …

Near-Ir Spectroscopic Analysis Of The Primary Volatile Composition Of Long And Short-Period Comets, Younas Khan

Doctoral Dissertations

"Comets are among the most well-preserved objects that formed in the protosolar nebula ∼4.5 Gyr ago. Hence, they are important for understanding various aspects of the formation, evolution, and habitability of the solar system. Multiple primary volatiles (molecules directly sublimating into the coma from the nucleus) emit via rovibrational transitions in the near-IR, providing opportunities to calculate their abundances. To date, only ∼50 comets have been characterized for their primary volatiles, with the short-period Jupiter-family comets (JFCs) being significantly underrepresented. In contrast, hundreds of comets have been sampled at optical/UV wavelengths, primarily for the composition of daughter species, leading to …

Introduction Of A Variable Inductance Transformer For The Design Of Resonant Power Converters, Angshuman Sharma

Doctoral Dissertations

"Magnetic integration is a hot topic in power electronics that concerns the use of a transformer's leakage and magnetizing inductances purposefully in isolated power electronic converters, thereby giving the opportunity to save the cost and footprint of any additional inductor. This is of prime interest, especially in CLLLC resonant converters which require up to three inductors. For a complete integration of these inductances, the concept of a variable inductance transformer (VIT) is introduced in this thesis. A VIT is an adaptive magnetic structure that facilitates an easy adjustment of both magnetizing and leakage inductances to meet their desired values. However, …

Fluorination Of Rubisco-Mimetic Co2 Capture Systems. Theoretical And Experimental Studies Of Ammonium Ion Acidity Depression And Carbamylation, Brian Michael Jameson

Doctoral Dissertations

"RuBisCO-inspired CO₂ capture and release (CCR) systems featuring amines have been developed for the purpose of reversable CO₂ capture from air. The enzyme active site consists of the tetrapeptide sequence Lys-Asp-Asp-Glu. The Lys sidechain amine undergoes carbamylation and an Mg²⁺ cation stabilizes the resulting carbamate. The N^a-acyl-lysinyl-aspratyl-aspartyl-glutamide (Lys-Asp-Asp-Glu, KDDE) peptide featured maximum capture at pH ≈ 10; a pH region too high for Mg²⁺ ions to remain in solution. This work aims to achieve pKa depression by introducing fluorine in the proximity of the lysine’s sidechain amine. A comparative analysis was made of butylamine, …

Applied Geochemistry, Geochronology And Biostratigraphy: Case Studies From The 38th Parallel Structures In Missouri And Orange Basin, Offshore Western South Africa, Marissa Kay Spencer

Doctoral Dissertations

"The unique alignment of the Decaturville, Crooked Creek, and Weaubleau geological structures in central Missouri, three of nine known such structures along the 38th parallel in Illinois, Missouri, and Kansas, has puzzled geoscientists for decades. Research using palynology (palynomorphs and particulate organic matter) and radiometric dating of impact spherules were used to constrain age and a relationship between these enigmatic structures and infer their paleoenvironmental conditions. Novel melting damages, unique to impact, were documented in the palynomorphs in all the three structures. Early Ordovician acritarchs with melted processes correlate with ⁴⁰Ar-³⁹Ar stepwise heating age of impact spherules …

Factors Influencing High School Physical Education Teachers' Content Selection, Olivia J. Gillispie

Graduate Theses, Dissertations, and Problem Reports (ETD)

There is limited research that has examined the factors that influence the selection of content for high school physical education. Addressing this gap in the literature is important, as those decisions influence student attitudes and engagement in physical education. The purpose of this study is twofold. First, this study aimed to explore what factors influence high school physical education teachers’ decision-making processes when selecting content to include in their curriculum (phase one). Second, this study investigated the facilitators and barriers to selecting and teaching the content areas suggested in the SHAPE America (2013) High School Grade-Level Outcomes (phase two).

This …

Magnetic Field Mapping Of A Large-Grain 1.3 Ghz Single-Cell Cavity, Ishwari Prasad Parajuli, Jean R. Delayen, Alex V. Gurevich, Gianluigi Ciovati

Physics Faculty Publications

A new magnetic field mapping system for 1.3 GHz single-cell cavities was developed in order to reveal the impact of ambient magnetic field and temperature gradients during cool-down on the flux trapping phenomenon. Measurements were done at 2 K for different cool-down conditions of a large-grain cavity before and after 120 °C bake. The fraction of applied magnetic field trapped in the cavity walls was ~ 50% after slow cool-down and ~ 20% after fast cool-down. The results showed a weak correlation between between trapped flux locations and hot-spots causing the high-field Q-slope. The results also showed an increase of …

Accessing The Relative Sustainability Of Point-Of-Use Water Disinfection Technologies Through Costs And Environmental Impacts, Bright C. Elijah

College of Graduate Studies: Theses & Dissertations

According to the World Health Organization, 785 million people lack access to basic drinking water facilities, and 144 million people rely on surface water which is prone to microbial contamination. Point-of-use (POU) water disinfection technologies can be adopted to help address these issues by treating water at the household level; however, navigating various POU disinfection technologies for a given water source or location can be difficult. While numerous conventional POU technologies exist (e.g., boiling water, POU chlorination), new emerging POU technologies (e.g., using novel materials or advanced processes) have been coined by developers to be lower cost with higher treatment …

Owasp Zap Vs Snort For Sqli Vulnerability Scanning, Christopher Kalaani

College of Graduate Studies: Theses & Dissertations

Web applications are important to protect from threats that will compromise sensitive information. Web vulnerability scanners are a prominent tool for this purpose, as they can be utilized to find vulnerabilities in a web application to be rectified. Two popular open-source tools were compared head-to-head, OWASP ZAP and Snort. The performance metrics evaluated were SQLi attacks detected, false positives, false negatives, processing time, and memory usage. OWASP ZAP yielded fewer false positives and had less processing time. Snort used significantly fewer memory resources. The internal workings of ZAP’s Active Scan feature and Snort’s implementation of the Boyer-Moore and Aho-Corasick algorithms …

Fermion Encodings And Algorithms For Quantum Simulation, Riley W. Chien

Dartmouth College Ph.D Dissertations

The study of the properties of quantum mechanical systems of many particles occupies a central role in condensed matter physics, high-energy physics, and quantum chemistry. In recent decades, developments in quantum information theory have suggested that quantum computers could become an especially useful tool for studying such quantum systems.

In this thesis, we address the additional challenges for quantum simulations posed by particles which are fermionic in nature, namely those caused by the nonlocal fermionic statistics. In particular, we study the encodings of fermionic degrees of freedom into the qubits of a quantum computer. We focus on finding a scheme …

Mofx-Db: An Online Database Of Computational Adsorption Data For Nanoporous Materials, N. Scott Bobbitt, Kaihang Shi, Benjamin J. Bucior, Haoyuan Chen, Nathaniel Tracy-Amoroso, Zhao Li

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Chemistry)

Machine learning and data mining coupled with molecular modeling have become powerful tools for materials discovery. Metal–organic frameworks (MOFs) are a rich area for this due to their modular construction and numerous applications. Here, we make data from several previous large-scale studies in MOFs and zeolites from our groups (and new data for N2 and Ar adsorption in MOFs) easily accessible in one place. The database includes over three million simulated adsorption data points for H2, CH4, CO2, Xe, Kr, Ar, and N2 in over 160 000 MOFs and 286 zeolites, textural properties like pore sizes and surface areas, and …

Intersectionality Of Self-Reported Food Insecurity And Perceived Stress Of College Students At A Land-Grant Southeastern Higher Education Institution During The Covid-19 Pandemic, Kendra Oonorasak, Makenzie Barr, Michael Pennell, Dylan Hardesty, Kotomi Yokokura, Samantha Udarbe, Tammy Stephenson

Journal of Higher Education & Student Affairs

College food insecurity (FI) and poor psychosocial health are prevalent public health issues in the U.S., yet often overlooked. Since the COVID-19 pandemic, repercussions on these critical inequity issues remain unclear. During the summer months of 2020, this cross-sectional survey examined associations between students’ self-reported FI and perceived stress (PSS-10), one aspect of poor psychosocial health. An anonymous online survey was distributed to a convenience sample of college students at a land grant institution of higher education in the southeastern U.S., and $10 e-gift card was provided to survey respondents. The survey response rate was 26.2% (n=235) and participants were …

Are Epicuticular Waxes A Surface Defense Comparable To Trichomes? A Test Using Two Solanum Species And A Specialist Herbivore., Sakshi Watts, Rupesh R. Kariyat

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

Although plants possess a suite of structural defenses, most studies have focused on trichomes. Trichomes can have both pre- and post-ingestive effects and have been consistently found to reduce herbivory. Along with trichomes, a few studies have focused on epicuticular waxes as an important defense; however, manipulated comparisons examining herbivore growth and development is limited. In this study, using two Solanum species (Solanum glaucescens and Solanum macrocarpon) that vary in both defenses, we tested the hypothesis that variation in defenses will affect herbivore feeding, primarily by restricting feeding commencement. We used electron microscopy together with a series of plant- and …

Implementation Of Course Structure In Stem Courses For Student Motivation And Learning, And Lab Innovation, Muzammil Arshad, Mamoona Muzammil

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Chemistry)

The present study is an extension of implementation of the course structure which was initially designed, developed and implemented at Texas A&M University for engineering courses. This study extends its implementation to other STEM courses to assess its applicability and effectiveness in science related courses. The course structure is employed at the Chemistry department at University of Texas Rio Grande Valley (UTRGV). The present study is an autoethnography of the implementation of the course structure and its effectiveness assessment. This study highlights the implementation of the course structure considering student motivation and learning since student motivation is an important research …

Docking, Synthesis Of Some Novel Flavonoid Analogues, And Their Biological Evaluation, Ishwar Bhat K, Afiya Abdul Aziz, Abhishek Kumar, Vijaya Bhaskar K, Vijay Kumar M

The Thai Journal of Pharmaceutical Sciences

Cancer remains a major class of morbidity and mortality despite basic and clinical research and trials of promising new therapies. In the current era, many drugs are marketed with flavonoid nucleus. Based on this information, this study aims to synthesize and screen flavones for their anticancer activity. Docking studies for cytotoxic activity of flavonoid derivatives targeting tankyrase enzyme were performed. A new series of flavonoid derivatives were prepared from chalcones. Chalcones were prepared between substituted benzaldehyde and 2-hydroxy acetophenone in the presence of potassium hydroxide as catalyst. The flavone derivatives were characterized based on IR, 1H NMR, and Mass spectral …

Application Of Concept Mapping In Telepharmacy Model Development For Prescription Filling At Primary Care Clusters, Nusaraporn Kessomboon, Siwapond Prasertsuk, Jirachaya Suttima, Nur-Ainee Korsem

The Thai Journal of Pharmaceutical Sciences

Background: Although the Pharmacy Council of Thailand has announced a standard telepharmacy service procedure, there may be some details or limitations that are specific to the primary care cluster (PCC) in the real situation. Objective: This research aimed to create a telepharmacy service model for the PCC using concept mapping techniques. Methodology: Group discussions were held, each participant will submit their opinions and graded of importance and possibilities of each opinion. After that, the data obtained were statistically analyzed to create a concept mapping. Results: From the group discussion, (n = 10) can be concluded that the optimum telepharmacy services …

Effects Of Quercetin And Its Derivatives On Mirnas And Inflammatory Mediators In Inflammation: A Systematic Review, Benediktus Wastu Paramabodhi, Eva Annisaa, Widyandani Sasikirana, Wimzy Rizqy Prabhata

The Thai Journal of Pharmaceutical Sciences

Quercetin has been known to have anti-inflammatory effects. Information regarding the anti-inflammatory effects of quercetin or its derivatives on inflammatory mediators and miRNAs is abundant and varied. However, a comprehensive understanding of its pharmacological actions at the cellular and molecular levels needs to be studied. Therefore, quercetin and its derivatives were studied in this systematic review to investigate how they affect the expressions of miRNAs and inflammatory mediators and their respective roles in the mechanisms of anti-inflammatory actions. A literature search in PubMed and Scopus databases was carried out based on the PRISMA protocol. Out of 2964 articles identified, 47 …

Anti-Diabetic Activity Of Bauhinia Strychnifolia Craib Stem Extract In Alloxan-Induced Diabetic Rats, Peerarat Thaina, Nattapaul Rattanamusik, Teepakorn Saraphee, Suriyan Tengyai, Attarat Pattanawongsa, Panupong Puttarak

The Thai Journal of Pharmaceutical Sciences

The α-glucosidase inhibitory and antioxidant activities of Bauhinia strychnifolia Craib in vitro have been explored; however, its effectiveness in vivo is still unknown. This study examined the hypoglycemic effects of B. strychnifolia extract. Acute toxicity was also investigated in mice using the up-and-down method. The experiments were carried out in both sexes of Wistar rats and female ICR mice. The results showed that the oral LD50 of the plant extract was greater than 5000 mg/kg. For the anti-diabetic investigation, diabetes was induced in rats by subcutaneous injection of alloxan (125 mg/kg). The hypoglycemic effect was evaluated by oral administration of …

In-Vivo Antidiabetic Activity And In-Silico Mode Of Action Of Gc-Ms Identified Phytoconstituents In Rhynshosia Cana, Praveena Yempada, Arya Lakshmi Marrisetti, Ganga Rao Battu

The Thai Journal of Pharmaceutical Sciences

Plants have been a primary medicinal source for thousands of years and are utilized time immemorial as popular traditional folk medicine. Rhynchosia cana (R. cana) had therapeutic qualities. In this research, the entire plant R. cana was exposed to maceration with methanol. This plant's methanol extract (MERC) was tested using Gas Chromatography-Mass Spectrometry (GC-MS), which shows 11 main components. Compounds discovered in-silico mechanism of action showed inhibition of α-Amylase and α-glucosidase enzymes. In vitro technique, the MERC also showed α-Amylase and α-glucosidase inhibition. Streptozocin-induced diabetes model evaluated the antihyperglycemic activity in vivo. Single intraperitoneal Streptozotocin injection at a dosage of …

The Type Of Pharmacy Ownership And Its Impact On Service Quality And Regulatory Compliance In Community Pharmacies, Afshin Azari, Farzad Peiravian, Nazila Yousefi

The Thai Journal of Pharmaceutical Sciences

Community pharmacies have always played an important role in the health system. Therefore, having a decent service provided by pharmacies is of paramount importance for the healthcare systems. The issue of pharmacy ownership and its possible impact on the quality of services as well as the number of violations, has been argued for many years. However, no research has been performed to investigate this issue, especially in Iran. This study investigates the impact of pharmacists’ and non-pharmacists’ ownership on the pharmacies’ violations and their service quality. Violations were examined using official pharmacy inspection reports and service quality was examined using …

Fp-23-15 Geographic Variation In Percentage Of Homeownership Among Never Married Adults, 2021, Francesca A. Marino

National Center for Family and Marriage Research Family Profiles

No abstract provided.

Fp-23-21 Maternal And Paternal Age: Births To Individuals Aged 40 And Older, 2016-2021, Karen Benjamin Guzzo

National Center for Family and Marriage Research Family Profiles

No abstract provided.

Fp-23-26 Age Variation In Never Married And Never Cohabited, 2008 & 2017, Krista K. Westrick-Payne, Wendy D. Manning

National Center for Family and Marriage Research Family Profiles

No abstract provided.