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Oxygen Removal From Coal Mine Methane By Vacuum Pressure Swing Adsorption, Chi Wing, Alex Tsang

Department of Construction, Environment and Engineering

The aim of this study was to develop a safe, efficient and environmentally friendly method for the treatment of coal mine methane (CMM) in order to achieve its efficient utilisation as an energy source while reducing the safety risks and environmental issues associated with it. Oxygen removal from a model CMM, which contained about 37 % CH4 and the balance air, was carried out by vacuum pressure swing adsorption (VPSA). Two commercial carbon molecular sieves, CMS1 and CMS2, were used as adsorbents, in which CMS1 has higher selectivities of O2/N2 and O2/CH4. To ensure the safety of the oxygen removal …

Valorisation Of Food Waste Into Bio-Based Polyurethane Rigid Foams: From Experimental Investigation To Techno-Economic Analysis, Chi Wing, Alex Tsang

Department of Construction, Environment and Engineering

Food waste (FW) constitutes a significant portion of municipal solid waste and thus requires proper treatment. A ‘waste-to-wealth’ concept, in this case, urges the valorisation of FW to produce value-added products, given that such waste contains significant quantities of diverse nutrients. While most of these efforts have been focused on the recovery of carbohydrates, this paper introduces an FW biorefinery scheme to valorise FW lipids (FWLs) into bio-based polyols for polyurethane rigid foams (PURF). Considering economic viability, cost-effective dosages of enzymes for FW hydrolysis were first investigated. Subsequently, the obtained FWLs were converted into biobased polyols through stepwise epoxidation and …

Thermogravimetric Characteristics And Evaluation Of Products During Pyrolysis Of Camellia Oleifera Seed Residues, Chi Wing, Alex Tsang

Department of Construction, Environment and Engineering

To investigate the potential of Camellia oleifera seed residues (COSR) as sources of bioenergy, a systematic evaluation of pyrolysis behavior for COSR was conducted. For pyrolysis kinetics and thermodynamic analysis, Coats-Redfern (CR) model was employed based on thermos-gravimetric (TG) experiments. As heating rates increased, the TG curves and the temperature peaks of the derivative thermo-gravimetric (DTG) curves moved to a higher temperature due to a lag phenomenon. According to kinetic analyses, the activation energy (Ea) was 95.40–107.97 kJ/mol. With using the obtained Ea, thermodynamic parameters were calculated, including pre-exponential factor (A), enthalpy change (ΔH), Gibbs free energy change (ΔG), and …

Full Tailored Metal Content Ncm Regeneration From Spent Lithium-Ion Battery Mixture Under Mild Condition, Chi Wing, Alex Tsang

Department of Construction, Environment and Engineering

Mild conditioned, second-life ternary nickel–cobalt–manganese (NCM) black powder regeneration from spent lithium-ion batteries’ (LIBs) black powder mixture was demonstrated after mild conditioned p-toluenesulphuric acid (PTA)-assisted wet leaching. The NCM ratio was tailored to several combinations (333, 523, 532, and 622) by adding a suitable amount of metal (Ni, Co, Mn)-sulphate salt to the leachate. Regenerated NCM was obtained by co-precipitation with sodium hydroxide pellets and ammonia pH buffering solution, followed by lithium (Li) sintering under ambient air and size sieving. The obtained regenerated NCM powder was used for the energy storage materials (ESM) in coin cell (Li half-cell, CR2032) evaluation. …

Study Of Microalgae Bio-Fixation For Carbon Capture And Utilization(Ccu), Chan Cho Yin

Department of Construction, Environment and Engineering

Human activities have significantly increased the global C02 level (>400 ppm) resulting in global warming and extreme climate changes. Microalgae can be used to remove C02 by its high bio-fixation rate. In this study, microalgae bio-fixation at different levels of C02 (i.e., atmospheric condition and flue gas —20%) was conducted in the presence and absence of enzyme; carbonic anhydrase (CA), which was extracted from microbial cells to catalyse the conversion process between dissolved C02 gas and HC03• ion in the growth medium, while microalgae can readily utilize the for their growth and biomass production. Growth of microalgae was measured …

Study Of Microalgae Biofixation With Bacteria Carbonic Anhydrase For Carbon Capture And Utilization, Chan Cho Yin

Department of Construction, Environment and Engineering

Climate change has been significantly affecting human activities due to the accumulation of greenhouse gases, such as carbon dioxide. Biofixation of carbon dioxide (CO2) has been investigated to reduce the atmospheric CO2 level and slow the rapid increase in the global temperature. Carbon capture and utilization (CCU) can be performed by either physio-chemical or biological methods. The latter takes place in ambient temperature and mild conditions, such that there is no need for high pressure and high energy consumption nor hazardous chemicals. Biofixation by microalgae has been utilized to capture CO2 and the microalgae biomass collected after the process can …

Plant-Parasitic Nematodes Associated With Maize, And Their Relationship With Soil Properties In Southern And Southwestern Ethiopia, Abebe W. Aseffa, Beira H. Meressa, Tadele Tefera, Kristina K. Green, Peter Anderson, Esayas Mendesil

All Peer-Reviewed Publications

Maize is an important cereal crop in sub-Saharan Africa (SSA). Plant-parasitic nematodes significantly impact maize production. However, research on maize nematodes in SSA is limited. The current study aimed to assess the occurrences and densities of nematodes associated with maize and to assess the correlation of some soil physicochemical properties with nematodes in southern and southwestern Ethiopia. One hundred and eighty-six soil and root samples were collected from 62 maize fields (31 from Hawassa Zuria and 31 from Mana districts). Eleven plant-parasitic nematode genera were identified. The most important genera of plant-parasitic nematodes identified were Meloidogyne and Pratylenchus, followed by …

Characterisation Of ‘Giant’ Cysts Of The Potato Cyst Nematode, Globodera Rostochiensis, Present In Potato Fields In Kenya, James A. Price, Kelsey Hunt, Newton Nyagah, Calvince Orage, Onesmus Mwaura, Solveig Haukeland, Danny Coyne, John T. Jones

All Peer-Reviewed Publications

Potato production in East Africa is seriously impacted by the potato cyst nematode (PCN), Globodera rostochiensis, where it has been recorded in at least three countries. In Kenya, it is widespread in all major potato-growing regions, often at very high densities. Consecutive cropping of potato on the same land and a sub-tropical climate have influenced PCN biology. For example, unusually large cysts have been regularly recovered. We have analysed the biological properties of these ‘giant cysts’. The giant cysts contained more eggs than those recovered from UK fields. Egg size did not differ from UK populations and there was no …

A Convolutional Neural Network With Image And Numerical Data To Improve Farming Of Edible Crickets As A Source Of Food—A Decision Support System, Henry Kyalo, Henri E.Z. Tonnang, James P. Egonyu, John Olukuru, Chrysantus M. Tanga, Kennedy Senagi

All Peer-Reviewed Publications

Crickets (Gryllus bimaculatus) produce sounds as a natural means to communicate and convey various behaviors and activities, including mating, feeding, aggression, distress, and more. These vocalizations are intricately linked to prevailing environmental conditions such as temperature and humidity. By accurately monitoring, identifying, and appropriately addressing these behaviors and activities, the farming and production of crickets can be enhanced. This research implemented a decision support system that leverages machine learning (ML) algorithms to decode and classify cricket songs, along with their associated key weather variables (temperature and humidity). Videos capturing cricket behavior and weather variables were recorded. From these videos, sound …

Time And Change: A Meta-Analysis Of Temporal Decisions In Longitudinal Studies, Helen Hailin Zhao, Abbie J. Shipp, Kameron Carter, Erik Gonzalez-Mulé, Erica Xu

Management Faculty Publications

Longitudinal research has grown in popularity in the field of management and organizations. However, the literature has neglected to consider the important ways in which researchers' temporal decisions can influence observed change in longitudinal studies. Researchers must make a set of temporal decisions to capture change, such as the temporal precision of the hypothesized form of change, the selection of a sample that is expected to exhibit the change, the choice of variables to be measured repeatedly, the frequency of measurements, and the time interval between measurements. However, these decisions typically are based on "educated guesses," which makes their effects …

Role Play Or Real Play: A Quasi-Experiment In The Counseling Classroom, Elke Schmeling

University of the Pacific Theses and Dissertations

The relationship between pedagogy and self-efficacy beliefs is at the core of this dissertation. A continued demand for mental health service providers who can handle challenging caseloads requires novice professionals who are both well prepared and confident in their own skills and abilities, as self-efficacy is a positive predictor of performance. Since experiential learning opportunities are considered particularly beneficial to fostering self-efficacy beliefs, two cohorts of graduate students in a beginning psychotherapy course who engaged in different experiential learning activities were compared in terms of their counseling self-efficacy growth over the course of one semester. One cohort of students engaged …

On The Influence Of Private Stimulus Magnitude When Reporting Private Events, Christian T. Hickman

University of the Pacific Theses and Dissertations

The nature of private events provides challenges to developing a scientific understanding of the conditions under which humans learn to describe private events. Replicating and extending procedures from Stocco et al. (2014), we further evaluated the conditions under which verbal responses come under the control of private stimuli. Given that some participants vocal responses came under the control of public stimuli in Stocco et al. (2014), we implemented more subtle public accompaniments with all participants to reduce the likelihood of public stimuli acquiring control of participant’s verbal responses. Further, we systematically manipulated the visual clarity of the presented stimuli using …

Insight Into A Sexually Dimorphic Ostracod Crustacean By Mass Spectrometry And Microtomography, Cindy D. Davis

University of the Pacific Theses and Dissertations

The importance of the central nervous system cannot be understated. An array ofmolecules associated with the brain regulate basic behaviors as well as sex specific behaviors. Describing the molecular background is not the only way that I can learn more of the central nervous system. Describing the anatomy of the central nervous system can be crucial in understanding what regions of the brain is particularly key to the animal. Euphilomedes carcharodonta is a small marine crustacean native to the subtidal zone of the California coast. This ostracod makes for a compelling candidate to explore these research interests as this organism …

Exploring Culture, Support, And Success Among Mexican American Female Students At A Hispanic Serving Institution, Joanna Saldana

University of the Pacific Theses and Dissertations

Educational attainment among Hispanic populations in the United States remains a challenge, particularly among Mexican Americans who exhibit lower rates of degree completion. This dissertation examined the influence of cultural factors, specifically familism and collectivism, on the educational experiences of Mexican American undergraduate women at San Joaquin Delta College (SJDC) in California's San Joaquin Valley. The study aimed to elucidate how levels of familism and collectivism predict social, academic, and psychological support needs, as well as success strategies among this demographic.

Literature highlights the significance of familism, emphasizing familial obligations, and collectivism, prioritizing group harmony, within Mexican American communities. Mexican …

Proportional Reasoning: Understanding Student Thinking With Direct And Inverse Proportions, Emma Marshall

Honors Program Theses

The topic of proportions in mathematics is often misunderstood by students, yet proportional reasoning is the foundation for higher-level math. The purpose of this study is to understand how students are currently solving direct and inverse proportion problems and how the degree of difficulty increases when solving inverse proportion problems. There is little research done about student thinking with inverse proportions. Primary data has been collected from students and will be used to analyze students’ thinking about inverse proportion as well as a comparative look between direct and inverse proportional reasoning. By understanding students' thinking about proportions, educators can better …

Integrating Music In Pk-12 Classrooms To Impact Behavior, Improve Academics, And Support Developmental Milestones In Children, Emily Grace Manis

Honors Program Theses

As a child, music was always a part of my life, and I believe this immersion has greatly impacted how I view music’s role in the world of education. I’ve always wanted to be a teacher, but it wasn’t until I started courses at the University of Northern Iowa that I really decided to focus on early childhood and social emotional learning. My desire to teach, combined with my passion for all things music, led to my decision to focus on how music integration can be a useful tool in every classroom. Specifically I want to focus the research and …

Why Would I Read When The Game Is On?: Reasons Adults Give For Reading Or Not, Emmy C. Nelson

Honors Program Theses

This thesis dives into the ideas of why people read and do not read, beginning in their childhood years. Many different factors add to why people choose to read or why they choose not to read. School plays an important role as to why people choose to read because reading is not necessarily a natural process since it is different from learning how to speak. Reading has to be taught and understood fully in order to read independently, understand the material, expand ideas, and connect with the reading. Without this, individuals can become “poor” readers or have a low reader …

Changing Demographics In A Rural Iowa High School: A Case Study Of The Experiences Of Emergent Bilinguals, Lindsay Carter

Honors Program Theses

For this thesis project, I conducted a qualitative case study of a rural high school facing demographic changes that affected the district’s population of English language learner (ELL) students. This study took place in Smalltown Community School District (all locations and names in this study are pseudonyms), an Iowa school district located in a very rural area of the state. I have close ties to this district and have spoken with people involved in their efforts to work with this population change they are facing. As a future teacher of ELL and multilingual students, I was highly interested in pursuing …

The Effect Of Gender-Based Occupational Segregation On Women's Earnings In The United States And Canada, Jadyn Grace Milius

Honors Program Theses

The gender wage gap continues to prove a contentious topic with some going as far as to question its existence. However, scholarly works continue to prove it is real and impactful. More fruitful debates have arisen about the source of this disparity in wages. This paper seeks to analyze one possible explanation for the pay gap: gender-based occupational segregation. I used OLS regressions based on women working full-time between the ages of sixteen and sixty-five to measure this. I find a negative effect of segregated occupations on women’s earnings across countries and years. On a similar note, the percentage of …

The Relationship Between Athletes' Competitive State Anxiety And Self-Confidence And Coaches' Behaviors, Derek Anderson

Honors Program Theses

Competitive state anxiety (CSA) and self-confidence are prominent issues in athletics and can cause detrimental effects on athletic performance. The purpose of this study is to analyze the effects of perceived coach anxiety and perceived coach self-confidence on athlete competitive state anxiety and self-confidence. It was predicted that as perceived coach anxiety increases, athlete competitive anxiety will increase. Furthermore, as perceived coach self-confidence decreases, athlete self-confidence will decrease. Ninety-six Division I athletes from three sports (men’s/women’s track and field, women’s soccer, women’s softball) were recruited. Participants ranged in age from 18 to 25 years of age (M = 20.33, SD …

A Literature Review Of Factors Contributing To Archaeal Diversity, Anna R. Carmen

Honors Program Theses

Archaea, being classified as its own separate domain only within the past fifty years, has earned a reputation of being notoriously difficult to culture in a laboratory setting. Because of this, their functions in ecosystems and potential for use in bioremediation is largely unknown and untapped. In order to further develop methodologies to successfully cultivate these microbes, an analysis of past research is needed to help understand where to lead research. After analyzing past studies on archaea and recalcitrant microbes as a whole, it is found that other factors are often overlooked and a label of recalcitrance is added. This …

Little Miss Sure Shot: Essays On A Young Woman Journalist's Search For Fulfillment, Mallory Schmitz

Honors Program Theses

No abstract provided.

The Effects Of Exercise In Cognitive Function In Older Ad, Josephine Sagan

Honors Program Theses

No abstract provided.

Balancing Progress And Ethics: Exploring The Science And Ethics Of Gene Editing: Literature Review, Jackson Burgess

Honors Program Theses

Two decades ago, the completion of the Human Genome Project marked a pivotal milestone in scientific history, unraveling the blueprint of human DNA and laying the foundation for the Genetic Revolution. This monumental achievement allows researchers to uncover the correlations between DNA sequences and biological functions. Today, this movement has propelled modern geneticists toward the peak of human health sciences: the ability to manipulate the very essence of our being. With the aid of Genetic Engineering, scientists now possess the capability to alter the fundamental framework of our genetic code, offering the potential to cure fatal genetic disorders alongside other …

Equity In Harmony: Music Teacher Preparedness And Perceptions Of Multilingual Learners In The Midwest, Mckenzie Vick

Honors Program Theses

The purpose of this study was to examine the perceptions music teachers in the Midwest have regarding working with multilingual students, how music education benefits their multilingual students, and how they perceive the struggles their multilingual students have regarding music education. The study was a qualitative study in which 5 teachers were interviewed on their perceptions. The study found that music teachers see many benefits of music education for multilingual students including: building a sense of belonging, helping with language learning, having a non-academic outlet, and providing additional socialization opportunities. It also found that teachers did not feel prepared to …

Beyond The Classroom: Do The Iowa Civic Virtues Standards Achieve Their Goals?, Damien Foster

Honors Program Theses

Civic education is essential in shaping informed and active citizens, and evaluating its impact is equally as fundamental. This study examines the connection between the Iowa civic virtues standards and the civic behaviors and attitudes of recent high school graduates. Through an online survey of college students in Iowa, findings suggest that while the standards effectively communicate civic values, there is a gap in translating this knowledge into practical engagement, particularly in political participation. Additionally, the rising influence of digital media on students' political decisions highlights the need for enhanced digital data and information literacy education. This study provides many …

Impact Of High School Climate And Bullying On Depression And Anxiety In Emerging Adulthood, Tyler K. D. Larson

Honors Program Theses

Depression and anxiety disorders are a significant public health concern, especially among adolescents and emerging adults. Education is a central component of adolescents’ lives that shapes their development and experiences. School climate refers to the overall nature and quality of a school’s environment. Social relationships, teaching and learning practices, school facilities, safety, and school connectedness all contribute to school climate. Previous studies have found that positive school environments serve as a protective factor against adverse mental health outcomes. However, many of these studies focus on a single aspect of school climate, and there is conflicting evidence on how school climate …

The Impact Of Covid-19 On The It Services Industry, Shekynah Annemarie Haworth

Honors Program Theses

The COVID-19 pandemic has caused significant disruptions across industries worldwide, and the information technology (IT) industry has been no exception. As IT professionals continue to face unprecedented challenges due to the pandemic, it is essential to understand the current effects of COVID-19 on the IT services sector and what the future may hold. This study aims to provide an up-to-date understanding of how the pandemic has influenced the IT services sector by conducting an in-depth survey among IT professionals. The research will primarily focus on the persistent challenges faced by IT professionals during the pandemic and what changes have occurred …

We Did What? To Whom? An Analysis Of How Us Educational Materials Present The Philippine-American War And Occupation, Jude Beekman

Honors Program Theses

Since the turn of the 21st century, decisions of American leaders have continued traditions of American exceptionalism and general attempts at dominance, although this is continuously brought into question. A generation has since passed through school and experienced curriculums that have implied such American exceptionalism and dominance. Acknowledged for decades, the military-industrial complex has extended into the 21st century with involvement across the globe, but notably in the Middle East. For those indigenous to the Pacific, militarism extends to how people perceive the bodies and selves of indigenous peoples. There exist multiple definitions of colonialism and imperialism, but in essence, …

Gender And Student Motivation In Domestic And Foreign Language Study, Macey Overturf

Honors Program Theses

No abstract provided.