Digital Commons Network^™

Remote Sensing Assessment Of Ionospheric Total Electron Content Over Thanjavur Gps Station Geomagnetic 2.91 N 152.22 E, Veera Kumar Maheswaran

Theses and Dissertations

A Global Positioning System (GPS) station for ionosphere studies was established during December 2019 in Thanjavur (Geographic 10.72◦ E, 79.01◦ N, Geomagnetic 2.91◦ N, 152.22◦ E). The study involved analysing Total Electron Content (TEC) data and correcting biases to estimate Slant Total Electron Content (STEC). STEC was then converted to Vertical Total Electron Content (VTEC), useful for space weather, navigation, surveying, and environmental monitoring.

During the course of our study, this Thanjavur station witnessed a Annular Solar eclipse of Dec-26, 2019. The Solar eclipses can impact ionospheric conditions, causing VTEC depletion. This study shows how the near-earth environment changes during …

Sustainable Valorization Of Woody And Herbaceous Biomass For Energy And Environmental Applications, Subramaniyasharma S

Theses and Dissertations

Pyrolysis is a thermochemical conversion method to produce gas and liquid fuels from lignocellulosic biomass. This process involves the thermal decomposition of organic compounds without oxygen. The vapors formed are rapidly condensed to yield a liquid product called bio-oil and a solid product called biochar.

In the present study, Sesame indicum (SI) (herbaceous agro residue) and Prosopis julifora (PJ) (woody biomass weed) were chosen as feedstocks for the pyrolysis process and the respective solid and liquid products were collected and characterized. The proportion of biomass pyrolysis products is significantly influenced by biomass composition and process conditions such as temperature, heating …

Motion Based Analysis Of Ultrasound Imaging For The Study Of Musculoskeletal Tissue Bio Mechanics, Ananth Hari R

Theses and Dissertations

Ultrasound image analysis plays an important role in diagnosing musculoskeletal injuries and monitoring rehabilitation exercises. The first and foremost step in this analysis involves segmentation of region of interest from the ultrasound images. The segmentation of the musculoskeletal tissues from the ultrasound images is challenging due to the inherent drawback present in ultrasound like : (1) Poor image quality due to image corruption by speckle noise, shadows, and attenuation. (2) Dis-continuous boundaries due to orientation dependence during the acquisition of image. (3) Low contrast between nearby anatomical structures. Hence in order to overcome these drawbacks, there is a need for …

Development Of Electrochemical Sensors For The Detection Of Pesticide Residues In Water, Indhu S

Theses and Dissertations

Intentional and unintentional events of pesticide poisoning and their accidental exposure have significantly raised the concerns of global organizations to classify these chemical compounds based on their toxicity, to assign permissible limits, and to appoint task force for periodic monitoring of their presence in water bodies.

In this context, researchers are continually seeking potential alternatives to develop water quality sensors with higher selectivity to obtain the desired performance during real-time assessment. Electrochemical sensors involving interface materials of distinguishing capacity at elevated matrix complexity are desirable. However, there remains a challenge in designing suitable techniques, methodologies, and appropriate validations to support …

Temporal Dynamics Of Coastal Sediment Characteristics: A Comparative Study On Pre- And Post-2004 Tsunami Event Along The Nagoor - Poompuhar Stretch, Tamil Nadu, Yamini S

Theses and Dissertations

Tsunamis represent some of the most devastating natural events for coastal regions, as exemplified by the 26th December 2004 Great Indonesian Earthquake triggered a massive tsunami across the Bay of Bengal and Indian Ocean, causing extensive destruction in various countries, including India. This study addresses a significant gap in the literature by focusing on the detailed sedimentological aspects of coastal dynamics. Specifically, it examines the pre-tsunami (December 2004), post-tsunami (January 2005), and recent (December 2022) sediment characteristics along a 35 km stretch of the Coromandel coast from Poompuhar to Nagoor.

Eight stations were selected for sampling: Poompuhar, Chinnankudi, Kuttyandiyur, Chandrapadi, …

Improving Fatigue Characteristics Of Cold Formed Low Carbon Steel, Venkatesan D

Theses and Dissertations

EN353 is a low carbon alloy steel, predominantly used in the manufacturing of heavy-duty gears, shafts, and pinions, especially crown wheel and pinions. It is usually carburized, hardened, and tempered to produce a hard, wear-resistant case. Heat- treated EN353 steel exhibits enhancement in ductility, toughness, strength, and hardness as the internal stresses get relieved in the material. Spheroidizing of medium and high carbon steel is a method of prolonged heating at a temperature below the eutectoid temperature, where pearlite, the lowest energy arrangement of steel, gets converted to ferrite and cementite.

The graphite content of steel assumes a spheroidal shape, …

Investigations On V2o5 And Its Derivative Nanocomposites For Photocatalytic Textile Organic Dye Degradation, Jenifer A

Theses and Dissertations

In recent times, organic dyes from industrial sludge become one of the significant causes of water contamination due to their utility in textile and paper manufacturing industries. These organic dyes are highly toxic and carcinogenic. Fortunately, the photocatalytic degradation process is a practical tool for decomposing toxic organic matter in wastewater by utilizing light. The photodegradation process can be performed using semiconductor materials to purify wastewater. Thus, semiconductor photocatalysis is a desirable alternative technique for decolorizing various organic pollutants.

In this context, the present work reports the preparation and characterization of V2O5 nanocomposites by facile methods and tests them against …

Identification Of Delamination Defect In Fibre Reinforced Polymer Composite Tapered Plate Based On Vibration Measurement, Venkatesan M

Theses and Dissertations

Fibre-reinforced polymer (FRP) composite plates have been widely used in various engineering applications due to their high strength-to-weight ratio, corrosion resistance, and durability. Despite their many benefits, Delamination is a separation of the layers in composite material and can occur due to various factors such as impact, fatigue, and manufacturing defects. Identifying delamination in composite structures is crucial for ensuring safety and reliability. In this study, model-dependent vibration methods, which are an effective non-destructive technique, were utilised for delamination identification. The primary objective is to investigate the dynamic behaviour of delaminated thickness-tapered plates and develop a reliable methodology for delamination …

Pm2.5 In The Respirable Air A Threat To Heart Health Investigating The Influence On Cardiovascular Performance And Unmasking The Potential Strategies For Cardio Protection, Bhavana Sivakumar

Theses and Dissertations

Air pollution, characterized by the presence of harmful substances in the atmosphere, represents a significant environmental and public health challenge impacting millions worldwide. The World Health Organization (WHO) reports that approximately 90% of the global population resides in regions where air pollution surpasses the recommended thresholds for healthy air quality. Within the realm of air pollution, the composition of particulate matter emerges as a pivotal consideration, particularly regarding PM2.5, comprising minute particles originating from diverse sources such as combustion processes, industrial operations, and natural phenomena like wildfires and dust storms. PM2.5 exhibit a range of chemical and physical attributes contingent …

Abnormal Event Detection Using Hypergraph Based Multiple Objects Tracking Techniques In Surveillance Videos, Palanivel S

Theses and Dissertations

Abnormal event detection aims to identify the events that deviate from expected normal patterns. This work primarily focuses on detection of rare events in public places. The existing research challenges in a video-based surveillance systems for the vehicle have been analysed and presence of abnormal objects in traffic-oriented videos have been detected. A novel approach for event summarization and rare event detection has been proposed in this work. The key ingredient in this work is the incorporation of Hypergraph (HG) matching.

Despite the reasonable amount of success achieved by a large number of researchers over the globe, distinguishing important videos …

Mathematics In Sri Rudram Of Krishna Yajurveda Taittiriya Samhita, Sundar Ks

Theses and Dissertations

This thesis is an attempt to bring out the concealed mathematical information in the Vedic text “Śri Rudram”, by applying Vedic Numerical Code to digitally decode the mantras in the Śri Rudram which forms part of the fourth canto of the Krishna Yajur Veda Taittiriya Samhitā.

By converting the letters into numbers, it was possible to handle the concealed information in a mathematical and logical way to successfully arrive at a convincing reason for the traditional practice of chanting Śri Rudram eleven times in a particular prescribed manner; as well as finding the close relationship between the number 11 and …

Mg3sb2-Based Materials For Mid-Temperature Thermoelectric Application, Veera Prabhu K

Theses and Dissertations

Recently, there has been growing research in the scientific community regarding the conversion of heat flux into electricity, which has proven effective in mitigating energy crises. Solid-state thermoelectric (TE) devices use the Seebeck effect to efficiently convert waste heat into electricity. Traditional materials contain toxic, rare, and expensive elements like Lead, Tellurium, and Germanium that restrict large-scale production, commercialization, and practical utilization.

Recently, Mg3Sb2-based materials have been attractive due to their remarkable characteristics, including abundance, affordability, and environmental friendliness. Furthermore,n-type Mg3Sb2-based materials exhibit high TE performance because of their high band degeneracy in the conduction band minimum (CBM), and low …

Investigation On Strength Durability And Crack Healing Efficiency Of Natural Fiber Reinforced Bacterial Concrete Under Various Exposures, Rajesh A

Theses and Dissertations

Concrete is the most broadly utilized construction material due to its availability and cost. It is more susceptible to cracks, allowing chemical substances and water to enter and deteriorate the materials over time, as well as affecting the durability properties of structures. In recent years, the use of bacteria and natural fibers in concrete has not only reduced cracks but also enhanced its strength and durability.

Microbial-induced carbonate precipitation (MICP) is highly acceptable in concrete to improve rheological and crack repair properties. In the current research isolated five bacteria from various locations and subjected to basic tests such as urease …

Emergence Of Extreme Events In Nonlinear Oscillators Due To Parametric And External Excitations, Kaviya B

Theses and Dissertations

This comprehensive PhD thesis immerses itself in the intricate world of dynamical systems, aiming to understand, characterize, and develop innovative mitigation strategies for rare and extreme events occurring within diverse nonlinear oscillatory models. The term "events" spans a broad array of occurrences within defined systems, with "rare events" standing out as infrequent outliers or deviations from the norm.

Rare events span various disciplines such as oceanography, climate studies, biology, economics, ecology, encompassing phenomena like rogue waves, floods, cyclones, earthquakes, and financial crises. Recognized for their potential to cause substantial harm to both society and the environment, these events are widely …

An Adaptive Hybrid Deep Learning Architecture For Providing Guaranteed Qos In 5g Cellular Networks, Rajilal Mv Ms

Theses and Dissertations

Wireless network systems must have effective resource allocation, particularly in the context of 5G networks when flexibility is needed to meet a range of network requirements. Resource allocation is essential in cellular network contexts to guarantee equitable access to customers, partners, and cellular service users. Since resource distribution determines network performance, it offers significant advantages when executed well. One of the biggest issues with 5G technology is resource allocation, particularly when it comes to the Quality of Service (QoS) for various applications. Resources in wireless networks include items like channels, power, and spectrum; these must all be apportioned according to …

Madurai Maavata Naatuppura Kalaivadivangalil Raamayanathin Selvaakku, Sindhiya T

Theses and Dissertations

No abstract provided.

Dnyanottarabhakti In Girvaṇa Dnyanesvari, Regunath Doss G Mr

Theses and Dissertations

No abstract provided.

Analysis Of Isotopic Effects On Hydrogen Oxidation, Jacob Carter Wilde

Theses and Dissertations

Tritium generation presents a significant hazard during operation of nuclear reactors and necessitates safety precautions in the case of a combustion incident. Accurate kinetic models should inform these safety precautions, however, reliable tritium data do not exist to generate such models. This work focuses on laminar flame speed, which is an important component of kinetic models. Current estimates based on established kinetic theories and experimental measurements of the other isotopes of hydrogen predict tritium to have a flame speed approximately 70% that of standard protium over a broad range of stoichiometries at one atmosphere in air. These estimates are based …

Geology Of Sinai Tholus, Thaumasia Plateau, Mars, Haley Mosher

Theses and Dissertations

A new geologic map of the Sinai Tholus region on the Thaumasia plateau, Mars reveals the structural, magmatic, and stratigraphic complexity that can be found in the Tharsis region on Mars, and may help answer key questions about the origin of the subvolcanic basement, evolution of the regional stress field, development of Valles Marineris, and magmatic history of the region. Sinai Tholus is a topographic high in a relatively flat, lava flow covered part of Thaumasia Plateau, just south of the central part of Valles Marineris. Here, five stratigraphic units and one generalized impact unit have been mapped at a …

A Novel Perfused Contusion Spinal Cord Injury Model To Assess Rapid Mechanical Properties Changes After Blood Spinal Cord Barrier Breakdown, Laura De Marchi

Theses and Dissertations

Blood-spinal cord barrier (BSCB) disruption exacerbates the tissue damage caused by spinal cord injury (SCI), but the mechanisms and dynamics of how the barrier breakdown affects the mechanical properties of the tissue remain unclear. The perfused bovine ex vivo indentation injury model described here represents a new platform to investigate the short-term effects of altered blood flow and vascular permeability following traumatic spinal cord injury. Our results indicate that injured cords exhibit changes to bulk perfusion, as evidenced by laser speckle contrast imaging, in addition to decreased barrier function shortly after injury. Indentation tests that simultaneously simulate a crush injury …

Small Town Superfund: History Of The Vertac Superfund Site In Jacksonville, Arkansas, Margaret Frances Stone

Theses and Dissertations

The Vertac Superfund site in Jacksonville, Arkansas was a man-made disaster that affected the city in multiple ways socially and economically. It began with the start of World War II, and the construction of the Arkansas Ordnance Plant in 1942. After the end of World War II, Reasor-Hill bought and reused the area for chemical production. While the company created jobs, it also began to create the setting for an environmental disaster, as more chemical companies traded the site around for chemical production, including the components for Agent Orange. It is inextricably connected to the Arkansas Ordnance Plant, the reuse …

Phosphorene As A Chemical Nanosensor For Volatile Organic Compound Vapours - A Dft Outlook, Saravanan S

Theses and Dissertations

Based on the density functional theory framework, the structural stability of phosphorene allotropes and its various nanostructures are ensured. The various allotropes of phosphorene and its nanostructures such as nanosheets, nanoribbon and nanotubes are used as adsorbing materials for various volatile organic compounds (VOCs) such as alcohols, chloroform, amines and aldehydes. The results of adsorption energy are used to confirm physisorption or chemisorption of VOCs on phosphorene. In addition, the charge transfer outcome suggests whether phosphorene is acting as acceptor or donor of electrons upon interaction of target VOCs.

The electronic attributes such as band structure, projected density of states …

The Impact Of Social Emotional Learning And Trauma Informed Care On Teacher Well-Being And Capacity In The Classroom., Kathleen Kelley Michalowski

Theses and Dissertations

Educators and students have encountered significant challenges, including illness and loss within their families due to events such as the COVID-19 pandemic. Traumatic events, like disasters, can greatly disrupt a community's functioning, resulting in widespread losses that surpass the community's ability to cope. Trauma-informed care (TIC) acknowledges that individuals are likely to have a history of trauma and aims to respond appropriately to minimize the likelihood of further trauma. By implementing trauma-sensitive routines and promoting social-emotional learning (SEL) for both students and educators, we can offer them more opportunities for success and emotional growth. It's important to recognize that educators' …

Analysis Of Networks Using Hypergraph Centrality Measures And Other Properties, Sathyanarayanan G

Theses and Dissertations

Network analysis explores the connections between nodes and evaluates their characteristics across diverse fields such as biological, chemical, social networks and so on. Identifying key nodes within a network is crucial for grasping how information spreads, which has significant applications across multiple fields. This includes studying disease transmission, managing rumours, understanding social leadership, enhancing viral marketing strategies, and monitoring public opinion. Influential nodes play a pivotal role in effectively distributing information throughout the network. The centrality measures are paramount in network analysis that uses various metrics to evaluate the importance of the node. The centrality predicts the characteristics and significance …

Incorporating Diverse Multimodal Texts Within A Seventh Grade Language Arts Classroom To Increase Comprehension Accessibility And Improve Engagement, Kaitlin Maher

Theses and Dissertations

This thesis examines if diverse, multimodal texts have an effect upon student engagement while increasing comprehension for students with varied learning styles. Applicable theories that gave direction to this research study were Multiliteracies Pedagogy, Culturally Responsive Teaching, Funds of Knowledge, and Constructivism. Throughout the unit’s duration, students were instructed with various types of multimodal texts that included song, video, graphic novels, and performance while also working with modern authentic, diverse traditional texts. Students were also given a choice of mode in how to respond and demonstrate understanding. The qualitative research study analyzed data sources such as student surveys; my teacher …

Chemistry And Processing Of Carbon/Carbon Composites From Furan-Based Polybenzoxazine Resins, Michael Chauby

Theses and Dissertations

Carbon/carbon (C/C) composites are valuable for applications requiring structural integrity at high temperatures. However, their widespread use is limited by high manufacturing costs. Monofunctional furan-based benzoxazine resins were identified as promising candidates for enhancing fabrication efficiency due to their low viscosity, high char yield, and high carbon density. A benzoxazine monomer synthesized from furfurylamine, formaldehyde, and benzyl alcohol (Bz-FA-H) exhibits a crosslinking reaction between the furan group and the hydroxymethyl para substituent on the phenol, not found with other monomers. An investigation using blends of monomers containing Bz-FA-H at various concentrations showed that increasing crosslink density resulted in increased bulk …

Tranisitioning From Film To Stage: Three Years Of Growth And Reflections, Ruihan Liu

Theses and Dissertations

This thesis delves into my journey as a Master of Fine Arts candidate specializing in Scenic Design within the Theatre program at the University of South Carolina.

Comprising seven chapters, this thesis provides a comprehensive exploration of my academic and professional trajectory. The introductory chapter offers insights into my transition from a background in Film Production to the realm of Theatre Arts, reflecting on the challenges and revelations encountered along the way.

Chapters 2 through 5 offer in-depth analyses of five stage productions wherein I served as a scenic designer during my graduate tenure. Each chapter delves into the creative …

A Comparative Analysis Of Teacher Innovative Practices And Principal Leadership Strategies In Microsoft Showcase Schools Implementing The Microsoft School Transformation Framework For Up To Two Years And More Than Two Years, Ibrahim Soykan

Theses and Dissertations

As global challenges such as climate change, shifting job markets, and technological advances intensify, educational systems must adapt to equip students with essential 21st-century skills. While countries like Singapore, Ireland, Australia, and Finland have created flexible education systems to meet these demands, the United States faces a fragmented and decentralized system that struggles to keep up with global changes (Wehling, 2007). This study investigates how the Microsoft School Transformation Framework (MSTF) is addressing these issues within Microsoft Showcase Schools (MSS). The purpose of this research was to evaluate how principals and teachers perceive the implementation of the MSTF and to …

Enhancing The Efficacy Of Task-Based Grammar Teaching: A Study Through Error Analysis Of Esl Learners At The Tertiary Level, Dhivya P

Theses and Dissertations

This study aims to determine the effectiveness of modern methods of teaching grammar and to test the student's learning through activities and games. The objective is to identify the students' grammatical errors regarding prepositions, articles, concord, tenses, and redundancy by practical methods and task-based activities. The study employed Corder’s Error Analysis method to understand the students' language learning process, indicate errors, and identify opportunities to develop learners' language awareness.

A pilot study was conducted involving both pre test and posttest for the students. The primary research involved pre test, posttest and retention tests for the students to evaluate the error …

What’S Mine Is Yours: Managing Student Loans Within Different Gender Couples, Samantha Leigh Moser

Theses and Dissertations

In the United States, borrowing student loans from the federal government or private market to attend college has become increasingly common. Roughly one in eight Americans has student loans (Looney, Wessel, & Yilla 2020). Reports on federal student loans indicate that roughly 1.6 billion dollars was outstanding in May of 2022 (Hanson 2022b). Additionally, about 43.4 million borrowers each owe an estimated $37,014 in federal education loans (Hanson 2022a). Privately, as of July 2023, $131 billion dollars was outstanding for education loans.

Sociologists have begun researching the consequences of student loan debt on borrowers and their families. Consequences of student …