Digital Commons Network^™

Multiphysics Prediction Model Of Microwave Curing For Thick Polymer Composites, Siva Dasari

Masters Theses

"Microwave curing technologies have many advantages over the traditional thermal curing methods for the manufacturing of fiber reinforced polymers, especially the processing speed and energy efficiency. Energy can be instantaneously transferred through applied electromagnetic fields and heat is generated based on dipolar rotational interactions. Microwave curing processes have been used for glass fiber composites but there are significant challenges associated with microwave curing of carbon fiber composites. Efficient heating may be difficult due to high dielectric loss associated with carbon fibers. Laminate quality will be highly dependent on the uniformity of the electromagnetic field in the material. In this work, …

Abrasion Resistant Concrete Mix Design For Cold Climates, Diane Mariah Murph

Masters Theses

“Studded tire usage in Alaska contributes to rutting damage on pavements resulting in high maintenance costs and safety issues. In this study, binary, ternary, and quaternary highly-abrasion resistant concrete mix designs using supplementary cementitious materials (SCMs) were developed. The properties of fresh concrete and mechanical, and durability properties of hardened concrete for these mix designs were then tested to determine an optimum highly-abrasion resistant concrete mixture which could be placed in cold climates to reduce rutting damage. SCMs used included silica fume, ground granulated blast furnace slag, and type F fly ash. Tests including workability, air content, drying shrinkage, compressive …

Methane Dry Reforming Reaction On Cr, V, In, And Ga Supported Sapo-34 Zeolite, Ehigiator Festus Ojo

Masters Theses

”The CO₂ reforming of methane is a significant research area in mitigating and transforming two greenhouse gases for the production of syngas. The reaction has been investigated for four different promoted catalysts to determine their reactant's conversion, product’s selectivity, and their respective syngas ratios.

The catalytic test was investigated under atmospheric conditions at 600⁰C for 6.5h with a WHSV of 4800 ml g^-1 h^-1. The conversion and selectivity of catalysts 9Al 1V-inc SAPO-34, 9Al 1Cr-inc SAPO-34, 9Al 1Ga-inc SAPO-34, and 9Al 1In-inc SAPO-34 were analyzed. The CH₄ conversion for the different catalysts are, 9Al 1Cr-inc …

Unmanned Aerial And Traversing Vehicle -- A Mobile Platform For Bridge Inspections, Clayton A. Fritsche

Masters Theses

“Unmanned aerial vehicles (UAVs), also known as drones, have been rapidly growing in popularity since their creation. This study aimed to create a robotic platform used to assist in the inspection process of the nation’s aging and deteriorating bridges. To this end, a multimodal inspection robot that utilized both flying and driving technologies, was designed, analyzed, and tested for aerial, traversing, and their transitional operability. The design, herein referred to as the “BridgeBot”, was evaluated both computationally and experimentally. A finite element model of the BridgeBot was established and analyzed under static loading scenarios to help determine stress distributions and …

Development Of Castrip Dual Phase Steel, Brenton Allen Hrebec

Masters Theses

“Thermomechanical processing necessary to produce DP 980 steel using CASTRIP hot band was investigated. The resultant steel has an ultimate tensile strength of 1038 MPa, yield strength of 744 MPa, and total elongation of 8.6%. These mechanical properties were achieved by batch annealing the hot band at 649°C for 48 hours and cold rolling to a 20% reduction. The steel was continuously annealed to simulate a galvanization cycle with an intercritical temperature of 810°C. The possibility of improving the texture of the steel by warm rolling under dynamic strain aging conditions was investigated. Dynamic strain aging in the CASTRIP hot …

Performance Of One-Part And Two-Part Class C Fly Ash-Based Alkali Activated Mortars, Cedric Chani Kashosi

Masters Theses

“Seeking an eco-friendly concrete, researchers have conducted studies to fully replace ordinary Portland cement (OPC) with fly ash (FA) producing alkali-activated concrete (AAC). Results showed better performance of AAC in terms of high early compressive strength, and durability compared to conventional concrete. However, much is still unknown about the behavior of AAC. From the type of materials used, the curing procedure, and long-term strength development of these binders; a thorough investigation is needed in order to fill the existing gap from previous studies and thus make a step forward to the safely use of AAC in the construction industry. The …

Feasibility Study For Sustainable Controlled Low-Strength Material (Clsm) Incorporating Off-Specification Fly Ash And Bottom Ash, Alexis K. Vandomelen

Masters Theses

“Controlled low-strength material (CLSM) is a self-consolidating cementitious material used in applications requiring high flowability and low strength. The primary components of this material, being cement and sand, however, negatively impact the environment. Cement is a large contributor to CO2 emissions, and the vast depletion of sand causes physical and political issues. Furthermore, over 100 million short tons of coal combustion products (CCP), including fly ash and bottom ash, are created annually in the United States, while nearly half of all CCP remain unused. No off-specification fly ash has been implemented in CLSM. This study uses coal ashes sourced from …

Laser Machining Countersinks In Carbon Fiber Reinforced Polymer, Leon James Neely Hill

Masters Theses

“Laser machining countersinks with a frequency doubled Q-switched diode pumped Nd:YAG laser is demonstrated. Tests were conducted in 0.100" thick IM7 prepreg CFRP with [0,90]3S orientation. The HAZ is minimized to avoid stress concentrations in the epoxy matrix. A chamber and filtration system was designed and built to contain the byproducts produced in the machining process. The variables investigated are the number of repetitions in the offset path, the plunge rate, and the line energy. The research was performed over one baseline study, one parameter space exercise, two full factorial experiments, and one repeatability study. Assessment was done under an …

Inclusion Engineering In Femnal Steels, Rairu Vaz Penna

Masters Theses

"Low density high Mn and Al steels, or FeMnAl steels, show great promise for military vehicles and automotive applications in which high strength and toughness is a requirement. However, these steels are subject to processing challenges including development of oxide and nitride inclusions during melting and casting as well as a large as-cast grain size and heavy interdendritic segregation. This can lead to non-uniform heat treatment response and cracking during subsequent hot rolling. Adding up to 10%Al lowers the density of these steels by as much as 15%, unfortunately, this also results in large amounts of hard and faceted AlN …

Exploration For Alteration Halos Around The Ag-W Deposits In Southeastern Missouri, Usa, Daniel Joseph Warbritton

Masters Theses

"The St. Francois Mountains in SE Missouri are an extensive terrane of granitic ring complexes and associated rhyolites. They were an important source of Ag, W, and Sn and mined intermittently from the 1800s until the 1950s. The Ag-W ores occur in the Silvermine Granite and rhyolite roof rocks. The deposits are classified as a xenothermal ore system with mineralization occurring in quartz veins and surrounding greisen (up to 2.5 m). Exploration for hydrothermal ore deposits often focuses on the identification of alteration halos in the surrounding host rocks. In the vast majority of xenothermal ore deposits, such as in …

Fan The Flames: Encouraging Local Expressions Of Christian Worship In A La Paz Church Community, Stephanie Cook

Masters Theses

When the members of a church in La Paz participated in a songwriting and arranging workshop, along with corresponding research into perspectives on local music used in worship, the results were mixed. An analysis of the songs used in the church’s worship shows a predominance of imported, predominantly Western or Western-styled songs. Similarly, observations of worship events in the church do not incorporate any local rhythms or instruments, even though there are musicians in the church who are skilled in Bolivian styles of music. While there is an interest by musicians and leadership in the church for locally written worship …

Redemptive Penology Vs. Exclusive Retributive Justice, Samuel Chuks Japhets

Masters Theses

Grounded on long-standing penal notions of exclusive retributivism inherited from classical theorists, Ancient Near East lex talionis, and theonomist penology, the United States federal sentencing and corrections system aims to administer just desert sentences on offenders, to curtail crimes. This exclusively retributive model of criminal sanction is, presumably transformative and innately capable of dispensing holistic justice to society, victims, and criminals. However, the preponderance of high rates of recidivism raises the question of whether this exclusively retributive doctrinal framework that drives the federal penology empirically results in a redemptive administration of penal justice, especially to the offender. Given the traditional …

The Origins Of Western Music And Its Influence On Modern Popular Music: Teaching Music Through A Musical Exploration Of Seven Countries, Johanna Katelyn Hatt

Masters Theses

The topics of music history and music appreciation cover a wide range of composers and musical contributions that at times, can be overwhelming to a student who does not have any musical knowledge. Through limiting the music appreciation course to the discussion of composers’ works from various countries, students are able to learn about the important contributions those composers and countries had to music, including modern popular music. This topic will bring value to the field of music education as it offers an alternative approach to the traditional method of teaching a music history course. With this holistic approach to …

Modeling Of Optimized Neuro-Fuzzy Logic Based Active Vibration Control Method For Automotive Suspension, Mohammad Adom Safiullah

Masters Theses

In this thesis, an active vibration control system was developed. The control system was developed and tested using a quarter car model of an adaptive suspension system. For active vibration control, an actuator was implemented in addition to the commonly used passive spring damper system. Due to nature of unpredictability of force required two different fuzzy inference system (FIS) were developed for the actuator. First a sequential fuzzy set was built, that resulted lower vertical displacement compared to basic damper spring model, but system had limited effect with disturbances of higher magnitude and continuous vibrations (rough road). To improve the …

Reprogramming Of Rat Hepatoma Cells With Fibroblast-Specific Protein Twist1, Kezban Ucar Cifci

Masters Theses

In mammalian development, a complex system comprised of regulatory signals causes tissue distinction with unique structures as well as functions. Gene expression controls these functions through specific combinations of transcription factors and cofactors that influence cell differentiation by both activation and repression of genes.

Whole genome microarray studies of fibroblasts have identified candidate genes that can serve as master regulators of fibroblast identity. A previous study showed that Prrx1 and Snai2 play important roles in activating expression of fibroblast identity, and Snai2 overexpression in hepatoma cells (Fg14) activated expression of fibroblast specific genes. Moreover, Snai2 overexpression resulted in repression of …

Single Parent Households And The Effect On Student Learning, Asia Watt

Masters Theses

The purpose of this research is to examine if there is a relationship between single-parent households and the effect on student learning. A total of seven parents and three elementary teachers took a survey. Students’ scores in math and reading from report cards and PARCC scores were also used as data sources. Results revealed that the involvement of single parents at school varies depending on the type of involvement, however, data from the report card review showed all the parents review their child’s report card. Approximately 70 % or more assisted their children in math and English homework. In addition, …

Solvation Properites Of Supercritical Carbon Dioxide Using Chirped-Pulse Fourier-Transform Microwave Spectra Of Carbon Dioxide / 1, 1-Difluoroethene (Dfe) Mixtures, Tulana Ariyaratne Subasinghe Arachchige

Masters Theses

Supercritical carbon dioxide (sc-C0₂) is a highly utilized industrial substance identified as an excellent solvent and a surfactant, which is cheaper and less hazardous than other typical solvents. The higher solubility of fluorinated hydrocarbons than their hydrocarbon (HC) analogs is not well understood and the theory behind the microsolvation of sc-C0₂ cannot be fully explained with the existing chemical information. Microwave spectroscopy is a good method of identifying the structural arrangement of clusters made from fluorinated HCs and C0₂. I n this project, microwave scans of the four different mixtures of 1 , 1-difluoroethene (DFE) …

Investigating The Prevalence Of An Insecticide Resistance Gene In Culex Mosquito Populations Of Central Illinois, Kylee R. Noel

Masters Theses

The globalization of society has led to the spread of the vectors, mosquitoes, and diseases. Each year millions of people are killed by diseases vectored by mosquitoes. For example, West Nile Virus alone killed over 2,000 people in North America in 2017; 8 of those deaths being in Illinois. Two prominent vectors of West Nile Virus are Culex pipiens and Culex restuans; which are difficult to differentiate based upon morphological features. In this study, mosquitoes collected from two Illinois counties, Coles County and Champaign County, were first identified based upon morphology and this identification was then compared to probe-based …

Pokemon Go And Mental Health, Nathaniel Ed

Masters Theses

Pokémon GO is a new type of game that emphasizes physical activity and social interaction. In the literature, both physical activity and social interactions have been shown to be positively correlated with mental health. Much research has been conducted on the effects of gaming on mental health, but to date no research has been done on the possible correlations of the game Pokémon GO and mental health. The present study was conducted to determine whether Pokémon GO players scored significantly lower than a control group of traditional garners on scales of depression, anxiety, and pathological gaming, and if they reported …

Government Expenditure And Unemployment: Empirical Investigation Of Sub-Saharan African (Ssa) Countries, Grace Ayiwah Fosu

Masters Theses

Over the years, there have been increasing trends in government expenditures in most countries in Sub-Sahara Africa, but some of the social-economic indicators such as health, unemployment, education, inflation, and the others paint a blurry image of the effect of the rising public spending. It is worrisome to see that pictures painted by the economic indicators show that budgets made by governments in Sub-Sahara Africa look good on paper than their actual effect in the economy (Andrews, 2010; Peterson, 2010). As a result of this, the question that keeps emerging is that “does government spending actually impact economic indicators in …

Teachers' Perception Of Mental Health In The School System, Nicholas Caldwell

Masters Theses

The study examined teachers' perceptions of their school's mental health system. Specifically, teachers were asked about their role in the identification process, how effective their school's system is at identifying and treating mental health problems, and their suggestions for improvement. Mental health problems affect a significant portion of today's youth (Merikangas et al., 2010). Mental health problems can negatively impact an adolescent's academic achievement, social relationships, and behavioral functioning (Woodward & Fergusson, 2001). Six teachers from a southeastern, rural Illinois high school participated in the study. Each teacher participated in a single interview and discussed their perceptions of the school's …

The Transition Of Male Student-Athletes To A Division I College, Tori Harrison

Masters Theses

Using a qualitative methodology, the researcher studied high school student-athletes transitioning to becoming college student-athletes at the Division I-level. The study was narrowed down to six, second-year male student-athletes. There were two participants from baseball, two from football, and two from men's track and field. These participants were interviewed and asked a range of questions about their high school experience, their legal guardians' involvement in high school and in college, what their recruiting process was like, and how they managed their transition from high school to college. The interview was broken up into three parts to better understand their transition: …

Using Digital Storytelling To Create Intercultural Awareness At Eastern Illinois University, Toluwalase Solomon

Masters Theses

Despite the increasing enrollment of international students at Eastern Illinois University (EIU), little is known about the integration of international students into the larger community. This creative thesis employs photovoice as a form of digital storytelling to amplify the voices of international students at EIU. Over an 8-week period, 7 international students from Cameroon, India, Ghana, Philippines, South-Korea, China, and France and the researcher captured images that told their stories of acculturation and socio-cultural adjustment in EIU. The main goal of this project is to improve college wide understanding on the actual lived experiences of international students in Eastern Illinois …

Middle School And High School Teachers' Actual And Perceived Use Of Praise And Reprimand, Melissa Beaudoin

Masters Theses

This study aimed to examine teachers' natural praise and reprimand rates among 66 middle and high school teachers. In addition, teachers' perceptions of how often they praised and reprimanded were compared to their actual use of praise and reprimands. A total of 1,320 direct-observation minutes were collected using 20-min observations for each teacher. After teachers were observed they completed a survey rating their perceived use of praise and reprimand. Teachers were observed to use significantly more general praise compared to behavior specific praise. They were also observed to use significantly more mild reprimands compared to any other type of reprimand. …

Detection Of Beta-Lactamase Variants In Municipal Wastewater And Fresh Water, Sunil Pandey

Masters Theses

The occurrence and spread of antibiotic-resistant genes (ARGs) are pressing public health problems worldwide. A key factor contributing to the spread of ARGs is lateral gene transfer. Wastewater treatment plants (WWTPs) are measured hot spots of microbial diversity and resistance because they receive polluted wastewater from diverse sources and contain a variety of different environments with dense bacterial loads. Due to the overuse of antibiotics the genetic capacities of microbes have profited. This helps every source of resistance gene and every means of horizontal gene transmission to develop the multiple mechanism of resistance to each antibiotic used clinically, agriculturally, or …

Support From Above The Glass Ceiling: Narratives Of Women As University Student Leaders, Rebecca Schwartz

Masters Theses

Using qualitative methodology. the researcher examined motivations, social support networks, and challenges college women face in student leadership positions. Four semi-structured interviews were conducted at a midsized university in the Midwest with college women in various positions of organizational leadership. The researcher identified motivational factors for women to apply for leadership positions as well as described the social support network that exists for college women in positions of leadership. Challenges college women face in achieving higher leadership positions were also identified. Lastly, recommendations were made for student affairs professionals and women in leadership based on the research findings.

Teacher Perceptions Of Evidence-Based Classroom Management Practices, Chloe Lindstrom

Masters Theses

The current study examined teachers' perceptions of 20 evidence based classroom management strategics. Participants were asked to complete an online survey that required them to rate their use, acceptability, and self-efficacy for each of the strategies, as well as demographic questions such as whether they had taken a behavior management course during their training program, and how long they have been teaching. Participants included 202 kindergarten through eighth grade teachers across the state of Illinois. Results indicated that teachers on average reported using 18 of the 20 strategies, and that there was not a significant difference in number of strategies …

Student Use Of Institutional Social Media, Hayley Elizabeth Hanger

Masters Theses

This study is a quantitative exploration of student use of their university's social media accounts at a mid-sized Midwestern institution. The survey was conducted via Qualtrics and was emailed to all undergraduate on-campus students. T-tests showed that differences in reason for use existed across gender, race, and first-generation status. Chi Square test results showed a statistically significant gap between the amount of White and non-White students following institutional social media accounts. Descriptive statistics also indicated that lack of awareness is the driving reason students do not follow institutional social media accounts. Recommendations were made to increase advertisement of social media …

Exploring High School Students' Attitudes Towards Reading, Heather G. Crivilare

Masters Theses

This study explored high school students’ attitudes towards reading as both a recreational activity and academic endeavor; while there are numerous studies regarding the reading habits of younger children, there is a deficit of research into the reading habits of students beyond the middle school years. This study surveyed and interviewed freshmen-through-senior students in a medium-sized, rural Illinois high school about their habits as readers in order to explore the relationship between different environmental factors and reading, as well as between reading habits and college readiness. This study found a gender gap in reading enjoyment favoring female students; a decline …

College Students Experiences Participating In International Alternative Break Trips, Dayton L. Ehrlich

Masters Theses

This study sought to explore undergraduate students’ experiences participating in international alternative break trips. A qualitative approach was used to understand the motivating factors as well as the impact the trip had on them. Participants included three female undergraduate students who had participated in an international alternative break trip in Mexico were interviewed one-on-one. The results demonstrated there were multiple different motivating factors and impacts the students experienced. The motivating factors consisted of student involvement, they were all personally invited on the trip, practicing a new language, opportunity to leave the country, and service was not a motivator. The impacts …