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2023

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Selective Photodegradation Of Food Contaminants Using Titania-Silica-Iron Oxide Nanocomposites With Molecularly Imprinted Technology, Mehak Un Nisa Jan 2023

Selective Photodegradation Of Food Contaminants Using Titania-Silica-Iron Oxide Nanocomposites With Molecularly Imprinted Technology, Mehak Un Nisa

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this study, magnetic imprinted photocatalysts (Fe3O4@SiO2@TiO2@MIP and Fe3O4@SiO2@MIP@TiO2) have been synthesized successfully by surface molecular imprinting technique. 5,7-dimethoxy-coumarin was used as a dummy template to give specific recognition ability to AFB1. A range of analytical techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), vibrating sample magnetometer (VSM), and Branauer-Emmett-Teller (BET) were employed to study the crystal structure, morphology, and chemical composition of the nanocomposites. The HPLC-DAD was used to quantify the photodegradation efficiency of imprinted photocatalysts under different factors such as the source of irradiation light, initial concentration of analyte, amount of photocatalyst, and …

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Pea Protein Isolate As Emulsifier In Oil-In-Water Emulsion Model System, Mujahid Hassan Khan Jan 2023

Pea Protein Isolate As Emulsifier In Oil-In-Water Emulsion Model System, Mujahid Hassan Khan

Chulalongkorn University Theses and Dissertations (Chula ETD)

Plant protein has been progressively demanded as a new-trend, healthier-choice and bioeconomic ingredient. However, the fundamental and technical knowledge of plant-based protein to understand and improve their structural functions are limited. In this study, pea protein isolate (PPI) were selected to be evaluated its emulsifying role on the formation, stability and tribology of model oil-in-water emulsions. Since PPI is a functional ingredient with hypoallergenic property. Firstly, the emulsifying property of PPI were investigated with corn oil-in-water emulsion systems. The results showed that 1% w/v PPI could stabilize the emulsion system of 5% w/v corn oil at pH7 using the high …

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Crosslinking Enhancement Of Natural Rubber By Electron Beam, Mili Purbaya Jan 2023

Crosslinking Enhancement Of Natural Rubber By Electron Beam, Mili Purbaya

Chulalongkorn University Theses and Dissertations (Chula ETD)

Vulcanization is a crucial process that transforms raw rubber into a durable and useful material. During vulcanization, crosslinking points are created between rubber molecules, which convert them into a thermosetting substance. The conventional vulcanization method is carried out by the addition of some chemicals accompanied by the application of thermal energy. This study explored the possibility of using electron beam irradiation which is an environmentally friendly and short-time method for vulcanizing natural rubber. The research was divided into two parts. In the first part, the efficacy of electron beam vulcanization was compared to that of thermal vulcanization. Natural rubber containing …

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Cellulose Nanofiber/Poly(Acrylic Acid)-Based Hydrogel For Colorimetric Biomarker Sensors, Nichaphat Passornraprasit Jan 2023

Cellulose Nanofiber/Poly(Acrylic Acid)-Based Hydrogel For Colorimetric Biomarker Sensors, Nichaphat Passornraprasit

Chulalongkorn University Theses and Dissertations (Chula ETD)

This dissertation develops innovative CNF/PAA hydrogel-based colorimetric sensors for non-invasive biomarker detection, focusing on urea for chronic kidney disease (CKD) and sarcosine for prostate cancer (PCa). Hydrogels serve as a matrix for enzyme and indicator encapsulation due to their high absorption capacity and unique three-dimensional network, with CNF enhancing mechanical properties. The research is divided into two parts. Part I involves preparing a GO/CNF/PAA hydrogel via non-toxic radiation crosslinking, featuring high swelling capacity and enhanced laser absorptivity due to GO. This hydrogel, used as a patch for on-skin detection, shows vivid color changes to distinguish CKD patients from healthy individuals, …

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Polyaniline/Cellulose Nanofiber/Polyvinyl Alcohol Hydrogel-Modified Screen-Printed Graphene Electrode For Cd2+ And Ni2+ Detection, Pichapon Boonkrong Jan 2023

Polyaniline/Cellulose Nanofiber/Polyvinyl Alcohol Hydrogel-Modified Screen-Printed Graphene Electrode For Cd2+ And Ni2+ Detection, Pichapon Boonkrong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Heavy metal contamination in wastewater has been an environmental issue, so the determination of heavy metals by an accurate and simple method is important. In this work, polyaniline/cellulose nanofiber/polyvinyl alcohol hydrogel-modified screen-printed graphene electrode (PANI/CNF/PVA hydrogel-modified SPGE) was fabricated by combining the advantages of graphene and conductive hydrogel to increase the conductivity and preconcentrate the metal ions to fabricate the modified electrode for the simultaneous detection of Cd2+ and Ni2+. First, PANI/CNF nanocomposite was synthesized by in situ chemical polymerization, and CNF was shown to prevented PANI aggregation and provided sufficient porous structure on the modified electrode. The PANI/CNF nanocomposite …

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2023 Cheshire County Ac Agendas & Minutes, Diane Dugray Jan 2023

2023 Cheshire County Ac Agendas & Minutes, Diane Dugray

Advisory Council

No abstract provided.

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A Comparison Of Peak Ground Reaction Forces Of Pitches From The Stretch And Windup, Richard D. Edwards Jan 2023

A Comparison Of Peak Ground Reaction Forces Of Pitches From The Stretch And Windup, Richard D. Edwards

Graduate Theses/Dissertations

Ground reaction forces can help coaches and players understand the lower extremity biomechanics of pitching in baseball. Research has told us that there are repeatable characteristics of ground reaction forces that pitchers produce during a pitch. This study examines the differences in peak ground reaction forces produced from pitching from the stretch versus pitching from the wind-up. Five variables were recorded for each pitch from the push-off leg and the landing leg. Landing forces were then compared to landing forces of the other pitching style and the same comparison was made for the push-off leg. This was achieved by altering …

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Preparations, Sarah E. Lewis Jan 2023

Preparations, Sarah E. Lewis

Graduate Theses/Dissertations

The following thesis is an excerpt from a novel depicting Caleb Warring and his employer, Mr. Phineas Pruitt, in their business of running a funeral home. It’s been a year since Caleb started working for Mr. Pruitt and since the bodies they had been embalming and preparing started coming back to life. After researching and careful planning, the two decide to embark on a trip to discover the solution to their problem, accompanied by Caleb’s best friend and Mr. Pruitt’s sister. Through the technique of agential constellations, the use of the uncanny, and a distinction between horror and terror, this …

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Body Condition: Seasonal Effects And Influence On Aggressive Behavior Of Ozark Zigzag Salamanders (Plethodon Angusticlavius), Ayesha Farooq Jan 2023

Body Condition: Seasonal Effects And Influence On Aggressive Behavior Of Ozark Zigzag Salamanders (Plethodon Angusticlavius), Ayesha Farooq

Graduate Theses/Dissertations

Body condition is a measure of the size of energy reserves such as fat and protein, which can influence health and the ability to obtain resources in aggressive encounters. Individuals with better body condition ultimately experience a fitness advantage. Physiological factors such as sex, reproductive condition, and diet can influence body condition of individuals. Body condition could be affected positively or negatively after an animal is kept in captivity for extended periods of time. In the first chapter, I explore whether sex, season (fall and spring), and time in containment at the laboratory influences body condition. In the second chapter, …

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A Kansas City Founder "Proud Of His Position:" Race, Exploitation, And The Rise Of William Gilliss, Diane M. Euston Jan 2023

A Kansas City Founder "Proud Of His Position:" Race, Exploitation, And The Rise Of William Gilliss, Diane M. Euston

Graduate Theses/Dissertations

Americans are largely accustomed to the history of western expansion and enslavement by slaveholders. Questionable government policies led to the removal of Native American tribes further west. In Missouri, French Canadian traders moved to continue their business with them, and eventually, white settlement along the invisible border between Indian Territory and Missouri replaced indigenous peoples. William Gilliss, born in Maryland about 1797, is a prime example of an enterprising trader who, because of his reliance upon Native American tribes, followed his source of income west. His relationships with multiple Native American women resulted in at least three children. His relocation …

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A Hollow Victory And Unending Problem: The Undying Anti-Russian Insurgency In Ukraine, Abraham Ashley Jan 2023

A Hollow Victory And Unending Problem: The Undying Anti-Russian Insurgency In Ukraine, Abraham Ashley

Graduate Theses/Dissertations

This thesis uses quantitative and qualitative research methods to: (1) explore the base causes of insurgency in Ukraine, (2) examine the historical basis for Ukrainian insurgency, (3) provide historical examples of successful and unsuccessful insurgencies to contrast against Ukraine, and (4) provide recommendations for NATO and Ukrainian policy. Collectively, this project demonstrates that current Russian counterinsurgency tactics will not be successful without significant adjustment. This Ukrainian insurgency may also derail the possibility of peace in the region.

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Understanding And Advancing College Students' Mathematical Reasoning Using Collaborative Argumentation, Rachel Kay Heili Jan 2023

Understanding And Advancing College Students' Mathematical Reasoning Using Collaborative Argumentation, Rachel Kay Heili

Graduate Theses/Dissertations

This study explored students’ mathematical reasoning skills and offered supports to advance them through a collaborative argumentation framework in a college intermediate algebra class. The goals of this study were to make observations about student reasoning, identify specific actions to address those observations, and document student growth in reasoning as a result of those actions. An iterative analysis, mixed method study was conducted in which the researcher engaged students in responding to questions that required conceptual understandings using a collaborative argumentation framework as a tool to identify and code components of their responses—claim, evidence, and reasoning. After coding and analyzing …

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Investigating Relations Regarding The Religious Ought, Ideal, And Actual Self Using A Relational Density Theory Approach, Kam Barker Jan 2023

Investigating Relations Regarding The Religious Ought, Ideal, And Actual Self Using A Relational Density Theory Approach, Kam Barker

Graduate Theses/Dissertations

Religiosity may produce positive outcomes (e.g., greater life satisfaction, hope, and optimism) or negative outcomes (e.g., psychological distress), especially if the individual’s identity is in conflict (Koenig, 2001). This distress, as explained by self-discrepancy theory, is caused by inconsistency between the self-concept (attributes the individual believes they currently possess) and the self-guides, consisting of the ‘ought’ self (attributes the individual believes they ought to -or should- possess) and the 'ideal' self (attributes the individual desires to possess) (Higgins, 1987). Exploring stimulus relations related to these ‘selves’ using a relational density framework (Belisle & Dixon, 2020) may provide insight regarding relational …

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Measuring Microaggressions In The Advisor Advisee Relationship: Preliminary Scale Development, Samantha Lynn Bumgardaner Jan 2023

Measuring Microaggressions In The Advisor Advisee Relationship: Preliminary Scale Development, Samantha Lynn Bumgardaner

Graduate Theses/Dissertations

A number of survey instruments exist to measure microaggressions across various contexts and across numerous historically underrepresented groups. However, no such scale exists to assess microaggressions within the advisor-advisee relationship. The academic advisor-advisee relationship can make—or break—a student’s experience at a university, both personally and academically. Thus, microaggressions in the advisor-advisee relationship could impose numerous negative implications, both psychologically and academically. The goal of the present study aimed to develop a psychometrically sound scale to measure microaggressions in this association. Overall, findings from the present study offer preliminary support of a two-factor measure to assess microaggressions within the advisor-advisee relationship …

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Structural And Magnetic Study Of Epitaxial Ni/Nio Thin Films On Various Single Crystalline Substrates Using Pulsed Laser Deposition, Md Shaihan Bin Iqbal Jan 2023

Structural And Magnetic Study Of Epitaxial Ni/Nio Thin Films On Various Single Crystalline Substrates Using Pulsed Laser Deposition, Md Shaihan Bin Iqbal

Graduate Theses/Dissertations

In recent years, magnetic thin films have gained significant attention in the field of spintronics, which is a branch of electronics that utilizes the spin of electrons in addition to their charge. The applications in the spintronic sector rely on the magnetic properties of the thin films. To address this, Ni (FM)/NiO (AFM) thin films on single crystalline sapphire and lithium niobate substrates have been investigated using pulsed laser deposition (PLD) technique prior to hydrogen-reduction annealing to explore new functionalities. The manufactured films were extensively analyzed by state-of-the-art characterization techniques. X-ray diffraction (XRD) and X-ray reflectometry (XRR) show the structural …

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Dynamics And Timescales Of Magmatic Processes At Cerro Uturuncu, Bolivia, Sarah Jane Rasor Jan 2023

Dynamics And Timescales Of Magmatic Processes At Cerro Uturuncu, Bolivia, Sarah Jane Rasor

Graduate Theses/Dissertations

Between 12-25°S latitude there is prolific volcanism fueled by the Altiplano-Puna Magmatic Body (APMB), a mid-crustal magma body above the 30° angle subduction of the Nazca plate and within 60-70 km thick South American crust. Cerro Uturuncu, a stratovolcano constructed above the center of the APMB, can provide insight to the evolution of the APMB over time. Previous research suggests that the APMB is more homogenous near its center as opposed to its edges. However, the processes that led to greater homogenization as well as the structure of the magma body below Cerro Uturuncu remain unknown. This research contributes greater …

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Creating The Pause: A Theoretical Approach To Helping Students Achieve Creative Independence, Amanda J. Anderson Jan 2023

Creating The Pause: A Theoretical Approach To Helping Students Achieve Creative Independence, Amanda J. Anderson

Graduate Theses/Dissertations

This paper will detail how the 2020 Covid-19 pandemic revealed the need for a modification of our current educational best practices. This modification asks that teachers create an intentional Pause where students can spend time dwelling on content and making their own meaning before teachers intervene through scaffolding and front loading. It uses a combination of personal experience, review of best practices, and Covid-19 data to show that best practices did not transfer well during the pandemic. It will then provide evidence for the addition of the Pause as well as addressing anticipated counterarguments.

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In Between Lines: An Investigation Of The Ghanaian Migration Experience, Teddy Osei Jan 2023

In Between Lines: An Investigation Of The Ghanaian Migration Experience, Teddy Osei

Graduate Theses/Dissertations

As my socio-cultural experiences continue to evolve, so does my interest in contemporary border discourses. The question of ''who qualifies to be where and how,'' lingers in my mind daily as I reflect on my migration experience as a Ghanaian living in the United States of America. Another area of interest is the social and physical challenges endured by individuals transitioning from one geographic location to another.In replicating these experiences, I make ceramic sculptural vessels associated with sojourning. In my ceramic sculptures, I use specific elements, such as ropes and Ghana must-go bags, which honor Africa's past and its people …

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Examining Attitudinal Shifts Regarding Stem Education In Primary School Students With The Addition Of Game Based Assignments, Hayden Stricklin Jan 2023

Examining Attitudinal Shifts Regarding Stem Education In Primary School Students With The Addition Of Game Based Assignments, Hayden Stricklin

Graduate Theses/Dissertations

There are an estimated 3 to 4 million open job positions in STEM fields (Ball, Huang, Cotten, & Rikard, 2018; Chen, 2013), lacking qualified individuals to fill them. Graduation rates for undergraduate degrees in STEM fields average just over 430,000 degrees per academic year (National Center for Education Statistics, 2023), leaving an approximate 2.5 million positions unfilled. This lack of workers and qualified individuals is a concern for the scientific community because a lack of degrees obtained results in a lack of scientists in the field and therefore less opportunity for advancement. To address this issue, the researcher proposes a …

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Tissue And Sex-Dependent Regulation Of Innate Immunity And Rna Editing In Mice, Kelsey R. Kendrick Jan 2023

Tissue And Sex-Dependent Regulation Of Innate Immunity And Rna Editing In Mice, Kelsey R. Kendrick

Graduate Theses/Dissertations

Inflammation occurs as a result of insult or infection within the body. Individual cells respond to inflammation by upregulating genes that help mediate the immune response, such as ADAR1. ADAR1 helps regulate the immune response but also catalyzes a process called RNA editing. RNA editing alters the sequence of select mRNAs to alter the encoded proteins. The result is altered function of the encoded protein, which is often beneficial for the cell. Our goal was to determine how inflammation affects the function of ADAR1. Since we know that the effects of inflammation vary between different organs and sexes, we examined …

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The Future Of Alternative Energy? Simulating Methyl Stearate Pyrolysis Via Molecular Dynamic Processes, Sarah J. Adeoye Jan 2023

The Future Of Alternative Energy? Simulating Methyl Stearate Pyrolysis Via Molecular Dynamic Processes, Sarah J. Adeoye

Graduate Theses/Dissertations

The process of extracting and refining crude oil is both expensive and environmentally hazardous. The synthesis of biodiesel sourced from vegetable oils is a renewable process and less hazardous to the environment. Therefore, we seek to understand the pyrolysis procedure at an atomic level in hopes of optimizing future fuel viability. Herein, I analyze methyl stearate (a component of biodiesel) using an in-house database of ab initio trajectories, each simulating 1.0 ps (with 1.0 fs resolution). These jobs were observed for significant bond-breaking/forming events, the type of fragments produced, and the exact position and time for each event. Statistical analysis …

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On Covering Groups With Proper Subgroups, Collin B. Moore Jan 2023

On Covering Groups With Proper Subgroups, Collin B. Moore

Graduate Theses/Dissertations

In this paper, we explore groups that can be expressed as a union of proper subgroups. Using “covering number” to denote the minimal number of proper subgroups required to cover a group, we explore the nature of groups with covering numbers 3 and 4, while also finding covering numbers for p-groups, dihedral, and generalized dihedral groups.

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Riverine Fish Population Dynamics, Aaron P. Muehler Jan 2023

Riverine Fish Population Dynamics, Aaron P. Muehler

Graduate Theses/Dissertations

Dynamic rate functions (i.e., recruitment, growth, mortality) structure fish populations and are subject to latitudinal differences. These latitudinal differences are likely reflective of climatic variation and may result in spatially distinct populations that must be managed independently, especially in large systems such as the Upper Mississippi River system (UMRS). In order to successfully manage this system, an understanding of what drives these populations is required. The UMRS is useful for this investigation as it crosses 10° temperate latitude with widespread fish species found throughout. In this study, I investigated the synergistic relationship between latitude, vital rates, and abundance. Species were …

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Quantitative Song Variety In Relation To Genotype In A Hybridizing Chickadee Population, Shelby Madison Palmer Jan 2023

Quantitative Song Variety In Relation To Genotype In A Hybridizing Chickadee Population, Shelby Madison Palmer

Graduate Theses/Dissertations

The Black-capped chickadee (Poecile atricapillus) and Carolina chickadee (P. carolinensis) are North American songbird species that hybridize in a narrow contact zone stretching latitudinally from New Jersey to Kansas, USA. The association between genetic ancestry and song type in this hybrid zone has been studied independently several times and found to be minimal or absent, likely due to the influence of cultural transmission on learned song in the oscine passerine clade to which the chickadees belong. Despite this, the song of both species remains remarkably distinct in allopatry, suggesting a genetic constraint on certain qualities of …

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Phenomenological Study Into The Role Of Self-Efficacy In Minority Student-Athletes' Sport Performance, Tomas A. Singhgolden Jan 2023

Phenomenological Study Into The Role Of Self-Efficacy In Minority Student-Athletes' Sport Performance, Tomas A. Singhgolden

Graduate Theses/Dissertations

Self-efficacy is a person’s belief in their ability to successfully complete a task, which can be derived from four sources of information (i.e., past performance, vicarious experience, verbal persuasion, and physiological states). The role of self-efficacy in sporting performance is well documented as being positively associated with enhanced performance across multiple levels of sport (e.g., Olympic, collegiate athletes). Specifically, with collegiate athletes, high levels of reported self-efficacy have resulted in higher performance accomplishments. Although self-efficacy has been researched within sports, there is a dearth of knowledge examining ethnic minority athletes’ perceptions of self-efficacy related to their athletic performance. The aim …

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A Component Analysis Of Behavior Skills Training To Train School Staff To Implement Noncontingent Attention, Joshua E. Parrish Jan 2023

A Component Analysis Of Behavior Skills Training To Train School Staff To Implement Noncontingent Attention, Joshua E. Parrish

Graduate Theses/Dissertations

As the field of Applied Behavior Analysis expands into multiple disciplines, efficient and effective training becomes an increasingly important aspect of implementing behavior analytic methods and procedures in these additional disciplines. Specifically, as behavior analysis in schools increases, the need for an efficient method of training in implementing behavioral interventions increases due to multiple responsibilities held by school professionals and an occasional high student to teacher ratio. Behavior Skills Training (BST) is among the most researched forms of training for multiple levels of participants in increasing new skills. In evaluating the individual components of BST, effectiveness and efficiency may increase …

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Synthesis, Characterization, And Application Of Chitosan Nanoparticles For In Vitro Studies On Hela Cancer Cells, Rejeena Jha Jan 2023

Synthesis, Characterization, And Application Of Chitosan Nanoparticles For In Vitro Studies On Hela Cancer Cells, Rejeena Jha

Graduate Theses/Dissertations

Chitosan is a fibrous substance that is derived from chitin, a natural substance in the shells of crustaceans. It possesses all the necessary qualities for being used as carrier for the transport of drugs and genes into tumor, such as biodegradability, biocompatibility, hydrophilicity, and non-toxicity and cationic in nature. Ionic gelation method was used to synthesize chitosan (CS) nanoparticles (NPs). Ionic gelation is a very benign process chemically that requires mixing a CS aqueous solution with a sodium tripolyphosphate (TPP) aqueous solution at room temperature. In addition, a surfactant polyethylene oxide (PEO) alone and a diblock copolymer of PEO and …

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Renewable Fuels: Molecular Dynamics Investigations Into Pyrolysis Of Methyl Linoleate, Elson Osakpolor Eguaosa Jan 2023

Renewable Fuels: Molecular Dynamics Investigations Into Pyrolysis Of Methyl Linoleate, Elson Osakpolor Eguaosa

Graduate Theses/Dissertations

With the rapid depletion of the world’s supply of fossil fuels, especially petroleum products, petroleum prices have risen by approximately 800% between the 1970s and now and are projected to continue rising. It is also expected that the world’s consumption of energy will increase commensurate with its growing population. Although biodiesel is a good renewable alternative, it has its limitations including high production costs and poor low-temperature performance. We seek to improve conventional biodiesel with pyrolysis to produce low molecular-weight compounds with high energy densities. Understanding the pyrolysis path on the atomic scale is key as it will allow us …

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Geometric Dissections, Daniel Robert Martin Jan 2023

Geometric Dissections, Daniel Robert Martin

Graduate Theses/Dissertations

In the study of geometry, the notion of dissection and its mechanics are occasionally over-looked. We consider and trace the history and theorems surrounding geometric dissections in both recreational and academic mathematics. We explore the important advancements in this particular topic from antiquity through the nineteenth and early twentieth centuries. We conclude with an exploration of the Banach-Tarski paradox

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Growth And Characterization Of Sm3hfbi5, Patrick Lambdin Jan 2023

Growth And Characterization Of Sm3hfbi5, Patrick Lambdin

Graduate Theses/Dissertations

First found experimentally in 2015, topological Weyl materials are desirable compounds that have garnered much interest due to their ability to conduct electricity via their surface states even though the bulk material is a semimetal. Such a candidate, Sm3HfBi5, was discovered with a flux crystal growth method, following an extensive amount of reaction syntheses. This thesis reports on the discovery, growth, structural characterization via x-ray diffraction, and magnetization measurements on Sm3HfBi5.

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