UNT Libraries - 19,291 Matching Results

Search Results

Allowing Students to Have VOICES [Voluntary Options in Chemical Education Schedules] in General Chemistry I

Description: The purpose of this investigation (a quasi-experimental design called a non-equivalent design group (NEDG)) was to determine if allowing students in a science majors general Chemistry I course the choice in establishing the due dates that their homework was due to the instructor would improve course averages. This study covered two semesters with a total of 288 students participating with n = 158 in the fall and n = 130 in the spring. The students self-selected the homework group, VOICES, that best fit his/her needs which included (1) the instructor's homework schedule, (2) a student-customized schedule or a schedule that followed the exam schedule, or (3) all homework due by the last class day prior to the final exam. Online homework was assigned and graded with individual assignment and homework average grades collected and analyzed. No statistically significant differences were found among the VOICES groups with respect to final course average. Other results of this study replicated findings in the literature; namely, that there is a higher correlation between mathematics skills and course success. Course averages of students who had completed Calculus I or higher were statistically significantly higher than students with less completed mathematics coursework in all VOICES groups. Also, the percentage of successful students in the on-sequence semester (fall) was higher than the percentage of students in the off-sequence semester (spring). No differences were seen in any VOICES group's student demographics or high school chemistry preparation.
Date: December 2018
Creator: Ford, Robyn Lynn

Paralegal Students' and Paralegal Instructors' Perceptions of Synchronous and Asynchronous Online Paralegal Course Effectiveness: A Comparative Study

Description: To improve online learning pedagogy within the field of paralegal education, this study investigated how paralegal students and paralegal instructors perceived the effectiveness of synchronous and asynchronous online paralegal courses. Survey results were analyzed using independent samples t-test and correlational analysis, and indicated that overall, paralegal students and paralegal instructors positively perceived synchronous and asynchronous online paralegal courses. Paralegal instructors reported statistically significant higher perceptions than paralegal students: (1) of instructional design and course content in synchronous online paralegal courses; and (2) of technical assistance, communication, and course content in asynchronous online paralegal courses. Instructors also reported higher perceptions of the effectiveness of universal design, online instructional design, and course content in synchronous online paralegal courses than in asynchronous online paralegal courses. Paralegal students reported higher perceptions of asynchronous online paralegal course effectiveness regarding universal design than paralegal instructors. No statistically significant differences existed between paralegal students' perceptions of the effectiveness of synchronous and asynchronous online paralegal courses. A strong, negative relationship existed between paralegal students' age and their perceptions of effective synchronous paralegal courses, which were statistically and practically significant. Statistically significant relationships existed between paralegal instructors' perceptions of effective synchronous online paralegal course and the number of courses taught by the paralegal instructor. Lastly, this study provided practical applicability and opportunities for future research.
Date: December 2018
Creator: Farmer, Shelley Kristine

Development of an Observation System to Measure Narratives of a Teaching Interaction

Description: Having a measurable way to analyze how staff members describe teaching interactions is important for staff training and building a community of effective and caring practice. The purpose of this project, part of a larger program, is to develop a measurement system that captures descriptions of connected events (narratives) during teaching interactions. This project involved development of a reliable measurement system that discriminates between experienced and novice narratives of teaching interactions (contingency arrangements) across multiple cases of instruction. The participants were employees of a non-profit agency serving children with autism and their families. They volunteered to participate in the study. The development of the code included the systematic selection of high quality autism intervention video clips and asking participants to view the clips and describe events, and then coding responses. The participant narratives were then categorized by themes and analyzed. The results are described in the context of usefulness and limitations of the measurement systems. A mutielement design comparing responses across stimulus conditions was used to evaluate the sensitivity of the measurement system in discriminating between novice and experienced interventionists.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: December 2018
Creator: Hines, Dalai C

The Effects of an Instructional Package on the Emergence of Novel Intraverbals in Children with Autism

Description: We evaluated the effects of an instructional package on the emergence of novel intraverbals in children diagnosed with autism. Participants were two boys with a diagnosis of autism who had tact and listener repertoires for common objects and events, some intraverbal responses, and showed an ability to learn new intraverbal responses through direct instruction prior to participating in the study. Tact training, listener training, sorting training, and mixed training (listener and tact training) were conducted with each participant, with a probe to test for emergent intraverbals following each training step. If some emergence was seen during a probe following a training step, probes were conducted with the remaining sets to test for emergence in those sets as well. Multiple-exemplar training was conducted following the training steps if all targets within a set did not meet the criterion for emergence during probes. Results showed that for one participant, all four training steps, in addition to multiple-exemplar training, were needed to see emergence in all targets during probes for two sets, with the last two sets requiring only tact training before all targets had emerged during probes. The second participant required only tact training during three sets, with listener training required for one target in one set before all targets in all sets emerged during probes.
Date: December 2018
Creator: Macias, Heather A

A Control Theoretic Approach for Resilient Network Services

Description: Resilient networks have the ability to provide the desired level of service, despite challenges such as malicious attacks and misconfigurations. The primary goal of this dissertation is to be able to provide uninterrupted network services in the face of an attack or any failures. This dissertation attempts to apply control system theory techniques with a focus on system identification and closed-loop feedback control. It explores the benefits of system identification technique in designing and validating the model for the complex and dynamic networks. Further, this dissertation focuses on designing robust feedback control mechanisms that are both scalable and effective in real-time. It focuses on employing dynamic and predictive control approaches to reduce the impact of an attack on network services. The closed-loop feedback control mechanisms tackle this issue by degrading the network services gracefully to an acceptable level and then stabilizing the network in real-time (less than 50 seconds). Employing these feedback mechanisms also provide the ability to automatically configure the settings such that the QoS metrics of the network is consistent with those specified in the service level agreements.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: December 2018
Creator: Vempati, Jagannadh Ambareesh

Influence of Social Media on Decision Making of the Kuwait National Assembly Members: Case Study

Description: In Kuwait, an increase in the use of social media by the Kuwait National Assembly (KNA) has allowed it members to reach out to the public and so advance their political agenda. This study examines social media influences on the decision making process; addresses the lack of academic research in relation to KNA members; and seeks to understand the extent to which public political engagement using social media might affect the outcome of their decision making. The proposed social media influence model (SMIM) was used to explore the relationships and relative importance of variables influencing legislator decision making in a social media environment. The second decade of the twenty-first century saw a number of major issues emerging in Kuwait. A core mixed method design known as explanatory sequential was applied to multiple sets of data generated during KNA members' 14th (2013-2016) and 15th (2016-2018) terms. These data included Twitter messages (tweets), the KNA Information Center Parliamentary Information System legislation documents, and the news media articles. The sample was drawn from KNA membership, some of which used Twitter to comment on major events with specific hashtags and the Kuwaiti news media articles related to the same. Study results confirm and support the proposed SMIM. They also suggest that a single person or a group of individuals (in this case, legislators) can be influenced and motivated to use social media for self-promotion and/or advancing their political agenda. Consequently, they can be used to devise ways for improving the use of social media by KNA members in support of legislative work, which in turn will provide citizens with access to real-time information and enhanced political interaction.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: December 2018
Creator: Alfarhoud, Yousef T.

Where are the Women in the Ebola Crisis? An Analysis of Gendered Reporting and the Information Behavior Patterns of Journalists Covering a Health Outbreak

Description: Health officials estimate that the 2014 Ebola crisis disproportionately victimized women, who made up 75% of the disease's victims. This interdisciplinary study has two main goals. The first is to evaluate the news media's performance in relation to their representation of women caught up in the Ebola crisis because the media play an important role in influencing public responses to health. This study sought to understand the information behavior patterns of journalists who covered the Ebola crisis by analyzing how job tasks influence a journalist's information behavior. This study employed qualitative methods to study the perceptions of journalists who covered the 2014 Ebola outbreak. Semi-structured interviews were conducted with Liberian and American journalists who covered the outbreak to understand the choices that guided their reporting of the Ebola crisis. A content analysis of The New York Times, The Times, and The Inquirer was also conducted to examine the new media's representation of women in an outbreak which mostly victimized women. The findings suggest that covering a dangerous assignment like Ebola affected the information behavior patterns of journalists. Audience needs, the timing of coverage, fear, and the accessibility of sources, were some of the factors that influenced the news gathering decisions taken by the reporters. The findings also suggest that women were mostly underrepresented by the media as sources, experts and subjects.
Date: December 2018
Creator: Mumah, Jenny N

Improving Photovoltaic Panel Efficiency by Cooling Water Circulation

Description: This thesis aims to increase photovoltaic (PV) panel power efficiency by employing a cooling system based on water circulation, which represents an improved version of water flow based active cooling systems. Theoretical calculations involved finding the heat produced by the PV panel and the circulation water flow required to remove this heat. A data logger and a cooling system for a test panel of 20W was designed and employed to study the relationship between the PV panel surface temperature and its output power. This logging and cooling system includes an Arduino microcontroller extended with a data logging shield, temperature sensing probes, current sensors, and a DC water pump. Real-time measurements were logged every minute for one or two day periods under various irradiance and air temperature conditions. For these experiments, a load resistance was chosen to operate the test panel at its maximum power point. Results indicate that the cooling system can yield an improvement of 10% in power production. Based on the observations from the test panel experiments, a cooling system was devised for a PV panel array of 640 W equipped with a commercial charge controller. The test data logger was repurposed for this larger system. An identical PV array was left uncooled and monitored simultaneously to compare the effect of cooling, demonstrating that the cooled array provided up to an extra 132W or 20% of maximum power for sunny weather conditions. Future expansion possibilities of the project include automated water level monitoring system and water filtration systems.
Date: December 2018
Creator: Joseph, Jyothis

Smart Microgrid Energy Management Using a Wireless Sensor Network

Description: Modern power generation aims to utilize renewable energy sources such as solar power and wind to supply customers with power. This approach avoids exhaustion of fossil fuels as well as provides clean energy. Microgrids have become popular over the years, as they contain multiple renewable power sources and battery storage systems to supply power to the entities within the network. These microgrids can share power with the main grid or operate islanded from the grid. During an islanded scenario, self-sustainability is crucial to ensure balance between supply and demand within the microgrid. This can be accomplished by a smart microgrid that can monitor system conditions and respond to power imbalance by shedding loads based on priority. Such a method ensures security of the most important loads in the system and manages energy by automatically disconnecting lower priority loads until system conditions have improved. This thesis introduces a prioritized load shedding algorithm for the microgrid at the University of North Texas Discovery Park and highlight how such an energy management algorithm can add reliability to an islanded microgrid.
Date: December 2018
Creator: Darden, Kelvin S

Shaping Hagiography through Liturgy: Music for the Patron Saints of Three Cathedrals in Medieval Aquitaine

Description: While the development of hagiography over time has long attracted the attention of medievalists, scholars have not fully explored the critical role of the liturgy in prompting and transmitting these changes. This dissertation examines the liturgies for the patron saints of three musical and ecclesiastical centers in medieval Aquitaine: the cathedrals of Saint-Trophime in Arles, Saint-Just-et-Saint-Pasteur in Narbonne, and Saint-Étienne in Toulouse. Through the music, texts, and ritual actions of the liturgy, the clerical communities of these three institutions reinforced some aspects of their patron saint's legendary biography and modified others. Yet the process unfolded differently at each cathedral, revealing the particular preferences of the canons of each community as well as their changing circumstances during the Middle Ages. In Arles, the office for St. Trophime, which was likely composed at the cathedral, shows dramatic changes in the saint's hagiography. The clerics in Narbonne also composed an office for their patron saints but did not substantially change the details of Justus and Pastor's legendary biography. In Toulouse, the canons selected from among the preexisting repertoire of chants and texts available for St. Stephen, crafting liturgies that were particular to Saint-Étienne within a clearly Aquitanian context. By revealing the ways in which the clerics of Saint-Trophime, Saint-Just, and Saint-Étienne shaped the legendary biographies of their patron saints, my work provides new insights into the ways in which clerical communities throughout Latin Christendom shaped and reshaped the hagiographic portraits of their patron saints through the creation, compilation, and celebration of new liturgies.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: December 2018
Creator: Recek, Andrea

A Meta-Analysis of the Effects of Turkey's Technology Integration Initiative on Teachers' Attitudes

Description: The purpose of this study was to determine the overall effectiveness of Turkey's technology integration initiative on teachers' attitudes and examine the moderating effects of related study characteristics. The 22 studies in this meta-analysis, carried out between the years 2010 and 2017, investigated the effects of Turkey's technology integration initiative on teachers' attitudes and met the inclusion criteria. This study followed a traditional meta-analysis research approach utilizing Hedge's g effect size to combine studies. The effect size was calculated using Comprehensive Meta-Analysis (CMA) software. The result (g = .31) indicates that Turkey's technology integration initiative had a moderate but significant influence on teacher attitudes. In addition to teacher attitudes, barriers that could contribute to some K–12 teachers' lack of integration training were identified. Based on the results it is recommended that future professional development and training for teachers include assessments of teacher technology usage by administrators, an increase in time for collaborative planning among teachers, and more just-in-time technology support for technology integration.
Date: December 2018
Creator: Gorunmek, Fatih

Development and Integration of a Low-Cost Occupancy Monitoring System

Description: The world is getting busier and more crowded each year. Due to this fact resources such as public transport, available energy, and usable space are becoming congested and require vast amounts of logistical support. As of February 2018, nearly 95% of Americans own a mobile cell phone according to the Pew Research Center. These devices are consistently broadcasting their presents to other devices. By leveraging this data to provide occupational awareness of high traffic areas such as public transit stops, buildings, etc logistic efforts can be streamline to best suit the dynamics of the population. With the rise of The Internet of Things, a scalable low-cost occupancy monitoring system can be deployed to collect this broadcasted data and present it to logistics in real time. Simple IoT devices such as the Raspberry Pi, wireless cards capable of passive monitoring, and the utilization of specialized software can provide this capability. Additionally, this combination of hardware and software can be integrated in a way to be as simple as a typical plug and play set up making system deployment quick and easy. This effort details the development and integration work done to deliver a working product acting as a foundation to build upon. Machine learning algorithms such as k-Nearest-Neighbors were also developed to estimate a mobile device's approximate location inside a building.
Date: December 2018
Creator: Mahjoub, Youssif

Molecular Dynamics Simulations of the Structures and Properties of Aluminosilicate and Borosilicate Glasses

Description: Silicate glasses are the most common glass types and have impact on almost every aspect in our lives: from window, containers, to glass fibers for telecommunications. Unlike their crystalline counterparts, glass materials lack long-range order in their atomic arrangement but their structures do possess short and medium range characteristics that play critical roles in their physical and chemical properties. Despite active development of characterization techniques that have contributed to the understanding of glass structures, there remain key challenges in obtaining essential structural features of glasses. Atomistic computer simulations have become an increasingly important method in elucidating the atomic structures and in interpretation and/or prediction of composition-structure-property relationships of complex materials. In this dissertation, classical molecular dynamic (MD) simulations were used to investigate the atomic structures, dynamic and other properties of two important glass systems—aluminosilicate glasses and borosilicate glasses, which are the basis of most industrial and technologically important glasses. Firstly, a comprehensive study of peralkaline Na2O-Al2O3-SiO2 glass with varying Al2O3/SiO2, Na2O/Al2O3, Na2O/SiO2 ratios has been performed to obtain better understanding of the composition–structure–property relationships in this glass system. More than 99% of Al were 4-coordinated in these glasses, validating that Na+ tend to charge balance [AlO4]- network forming units first and then, excess Na+ was used to create non-bridging oxygen (NBO) on Si. As the drop of Na/Al ratio, the percentage of NBO decreases, indicating an increase of the glass network connectivity. In addition, polyhedral connection probability results show that Al tend to be randomly distributed in the glass structure, suggesting a violation of Lowenstein's rule. These structural properties were further used to explain macroscopic properties of glass, such as change of glass transition temperature (Tg) and hardness (Hv) with glass composition. Secondly, molecular dynamics simulations were used to understand the structural, thermal mechanical and diffusion behaviors of spodumene (LiAlSi2O6) ...
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: December 2018
Creator: Ren, Mengguo

Process Improvement of Surface Preparation of Structurally Bonded Helicopter Detail Parts

Description: The objective of this study was to increase the bond strength at the surface interface of a thin stainless-steel panel for structural bonding on a helicopter. To achieve this objective, six activation methods for applying the coating to the panel in the surface preparation process are presented and explored. Adhesion and roughness tests were conducted to determine which method consistently initiates the etch and improves the bond at the surface. Based on the test results, three methods proved to be effective in initiating the etch. Of the three effective methods, only one method exhibited significantly improved bond strength at the surface interface as well as consistently initiated the etch in solution. The applicability of this method is discussed, and recommendations are presented for further study.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: December 2018
Creator: Tafoya, Keirsten Breann

An Exploration of Elementary L2 Learners' Use of Metacognitive Strategies

Description: This multiple case study examined the experiences of elementary L2 learners who received instruction in either reciprocal teaching or the think aloud strategy (TAS), and identified patterns of use that emerged from participants' employment of the strategies. The three L2 participants took a pre- test and a posttest, were recorded using the strategies, and responded to interview questions about the strategies. Using qualitative data analysis techniques, four themes emerged from analysis of the data, including; talking like a teacher, I know what I know, established strategies, and declines to use the steps in the strategy. Implications from these findings suggest that the discussion facilitated by reciprocal teaching assists elementary L2 participants in better understanding the text and also supports their language acquisition, whereas TAS does not facilitate discussion. Further, even though reciprocal teaching promotes discussion, teacher assistance during discussion is necessary. Finally, it is essential that teachers are mindful of students' understandings of topics and the difficulty of texts used when students are learning the strategies.
Date: December 2018
Creator: McNeel, Michele E.

Exploring Growth Kinematics and Tuning Optical and Electrical Properties of Indium Antimonide Nanowires

Description: This dissertation work is a study of the growth kinematics, synthesis strategies and intrinsic properties of InSb nanowires (NWs). The highlights of this work include a study of the effect of the growth parameters on the composition and crystallinity of NWs. A change in the temperature ramp-up rate as the substrate was heated to reach the NW growth temperature resulted in NWs that were either crystalline or amorphous. The as-grown NWs were found to have very different optical and electrical properties. The growth mechanism for crystalline NWs is the standard vapor-liquid-solid growth mechanism. This work proposes two possible growth mechanisms for amorphous NWs. The amorphous InSb NWs were found to be very sensitive to laser radiation and to heat treatment. Raman spectroscopy measurements on these NWs showed that intense laser light induced localized crystallization, most likely due to radiation induced annealing of defects in the region hit by the laser beam. Electron transport measurements revealed non-linear current-voltage characteristics that could not be explained by a Schottky diode behavior. Analysis of the experimental data showed that electrical conduction in this material is governed by space charge limited current (SCLC) in the high bias-field region and by Ohm's law in the low bias region. Temperature dependent conductivity measurements on these NWs revealed that conduction follows Mott variable range hopping mechanism at low temperatures and near neighbor hopping mechanism at high temperature. Low-temperature annealing of the amorphous NWs in an inert environment was found to induce a phase transformation of the NWs, causing their crystallinity to be enhanced. This thesis also proposes a new and low-cost strategy to grow p-type InSb NWs on InSb films grown on glass substrate. The high quality polycrystalline InSb film was used as the host on which the NWs were grown. The NWs with an average diameter of ...
Date: December 2018
Creator: Algarni, Zaina Sluman

William's America: Royal Perspective and Centralization of the English Atlantic

Description: William III, Prince of Orange, ascended the throne of England after the English Glorious Revolution of 1688. The next year, the American colonists rebelled against colonial administrations in the name of their new king. This thesis examines William's perception of these rebellions and the impact his perception had on colonial structures following the Glorious Revolution. Identifying William's modus operandi—his habit of acceding to other's political choices for expediency until decisive action could be taken to assert his true agenda—elucidates his imperial ambitions through the context of his actions. William, an enigmatic and taciturn figure, rarely spoke his mind and therefore his actions must speak for him. By first establishing his pattern of behavior during his early career in the Netherlands and England, this project analyzes William's long-term ambitions to bring the Americas under his direct control following the 1689 rebellions and establish colonial administrations more in line with his vision of a centralized English empire.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: December 2018
Creator: Woodlock, Kylie Michelle

Enlightening Dark Tourism in Nepal

Description: This study aims to examine the motivation, experience and benefits of Nepalese domestic tourists visiting the seismic memorial sites after the 25 April 2015 earthquake (known as Gorkha earthquake). A total of 403 surveys was gathered from seismic sites of Nepal (Kathmandu, Bhaktapur and Patan). Data were tested to analyze why the tourists are interested in disaster sites and how their experience during their visit impact the benefits of the visits. Additionally, partial least square structural equation modeling (PLS-SEM) was employed to test the relationships among tourist motivations, experiences, and perceived benefits at the dark tourism sites in Nepal. Among the five motivational factors discovered, the empirical results depict that emotional reaction is the strongest factor of the dark tourism motivation, affecting both cognitive and affective experiences. Additionally, this study confirms that cognitive experience is more influenced by dark tourism motivations than affective experience. Among the four experience factors examined in the study, self-reflection is found to have the strongest impact of three aspects of perceived dark tourism benefits, such as knowledge gain, fulfillment, and appreciation. Overall, the findings of the study provide important implications to the management sectors of dark tourism sites, enhancing the importance of providing cognitive experiences (i.e. distributing the educational materials about the dark tourism events and offering the knowledgeable tour guide who can guide the sites) and affective experience of the tourists (storytelling about the events, organizing educational and volunteering programs at the sites). Further, this study contributes to the limited literature in the context of dark tourism and provide important managerial and practical implications based on the case of Nepal earthquake in 2015.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: December 2018
Creator: Thapa Magar, Asha

Critique, Hope, and Action: A Critical Content Analysis of Teacher-Selected Literature for the Elementary Classroom

Description: The purpose of this study was to analyze teacher-selected children's literature for its potential use with critical pedagogy in the elementary classroom. This multi-analytical study uses tenets from critical multicultural analysis (CMA) and components from visual analysis (VA) to guide a critical content analysis of teacher-selected children's literature. Since it is the only nationally-recognized book list solely selected by educators, the texts for this study were selected from the Teachers' Choices Reading List titles. Although prior research on teacher-selected literature for the potential use of critical pedagogy in the elementary classroom does not exist, the results of this study show many opportunities for such within the last three years of the Teachers' Choices Reading List. A discussion on these results is presented through Paulo Freire's concept of critical pedagogy, as described in three stages: critique, hope, and action. Implications for practice and research are suggested based on the results of the study.
Date: December 2018
Creator: Edwards, Jessica Lee Lavina

Chronic Homelessness and the Aging Population: Findings in a Homeless Sample from Arkansas

Description: Understanding underlying mechanisms and pathways that lead to chronic homelessness would help develop intervention strategies that could help prevent subsequent episodes of homelessness. Quantitative data for this cross-sectional study was gathered by interviewing individuals who were homeless in the State of Arkansas, using a structured survey between 2007 and 2011. Qualitative data was gathered using semi-structured interviews between 2016 and 2018. Chi-square statistics and a multivariate logistic regression model was used to analyze the quantitative data, while phenomenological methods were used to analyze the qualitative data. Nearly half of the study participants identified themselves as being chronically homeless. Chronically homeless adults in this region were significantly more likely to be older men with no family ties, more likely to be victims of domestic violence, have higher rates of physical health problems, and have alcohol and substance abuse problems. Results from the multivariate nominal regression revealed that individuals who reported themselves as chronically homeless were more likely to be in the 50 years or older age group. In addition, study findings highlighted a dynamic interplay between three biopsychosocial risk factors for homelessness. Fostering development of inclusive sustainable communities, intergenerational relationships, and shared housing practices could help ease such social inequities and prevent problems such as chronic homelessness in older homeless adults.
Date: December 2018
Creator: Chekuri, Lakshminaray

Design Principles for Metal-Coordinated Frameworks as Electrocatalysts for Energy Storage and Conversion

Description: In this dissertation, density functional theory calculations are performed to calculate the thermodynamic and electrochemical properties of metal coordinated frameworks for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Gibb's free energy, overpotential, charge transfer and ligands effect are evaluated. The charge transfer analysis shows the positive charges on the metal coordinated frameworks play an essential role in improving the electrochemical properties of the metal coordinated frameworks. Based on the calculations, design principles are introduced to rationally design and predict the electrochemical properties of metal coordinated frameworks as efficient catalysts for ORR and OER. An intrinsic descriptor is discovered for the first time, which can be used as a materials parameter for rational design of the metal coordinated frameworks for energy storage and conversion. The success of the design principles provides a better understanding of the mechanism behind ORR and OER and a screening approach for the best catalyst for energy storage and conversion.
Date: December 2018
Creator: Lin, Chun Yu

The Impact of American Conductors on the Development of Japanese Wind Band Repertoire as Evidenced in the Programming of Tokyo Kosei Wind Orchestra, Musashino Academia Musicae, Showa Academia Musicae, Senzoku Gakuen School of Music, and Tokyo University of the Arts

Description: The wind bands in Japan are considered by many scholars and wind band conductors to be among some of the finest ensembles in today's wind ensemble medium. The literature and repertoire of Japanese ensembles have evolved from orchestral transcriptions, patriotic music, and military marches to original compositions by European, American, and Japanese composers. British conductor Timothy Reynish states that Japanese wind band music has looked traditionally towards the United States and occasionally United Kingdom for inspiration and repertoire. This phenomenon can be attributed to the many collegiate American and the few English wind band conductors who traveled to Japan as guest conductors, and in some cases, became residents of Japan. The focus of this study is to closely examine this significant impact of American collegiate wind band conductors, their influence on Japanese programming and how that programming has affected the collegiate repertoire. This study includes surveys of repertoire, concert programs, discographies of recordings, and interviews with prominent American conductors currently conducting in Japan. This research documents the impact that American wind band conductors have had on the programming of Japanese wind bands and how their influence have altered the collegiate repertoire. Evidence of this impact is documented by Toshio Akiyama, who states that "The influence of visiting musicians from abroad must be measured as one of the most influential aspects affecting Japanese band growth. Although the effect of Japanese musicians traveling to the United States or Europe has been beneficial, the overall impact on large numbers of people has been more directly due to the visitors from abroad."
Date: December 2018
Creator: Lo, Albert

High Temperature Water as an Etch and Clean for SiO2 and Si3N4

Description: An environmentally friendly, and contamination free process for etching and cleaning semiconductors is critical to future of the IC industry. Under the right conditions, water has the ability to meet these requirements. Water becomes more reactive as a function of temperature in part because the number of hydronium and hydroxyl ions increase. As water approaches its boiling point, the concentration of these species increases over seven times their concentrations at room temperature. At 150 °C, when the liquid state is maintained, these concentrations increase 15 times over room temperature. Due to its enhanced reactivity, high temperature water (HTW) has been studied as an etch and clean of thermally grown SiO2, Si3N4, and low-k films. High temperature deuterium oxide (HT-D2O) behaves similarly to HTW; however, it dissociates an order of magnitude less than HTW resulting in an equivalent reduction in reactive species. This allowed for the effects of reactive specie concentration on etch rate to be studied, providing valuable insight into how HTW compares to other high temperature wet etching processes such as hot phosphoric acid (HPA). Characterization was conducted using Fourier transform infrared spectroscopy (FTIR) to determine chemical changes due to etching, spectroscopic ellipsometry to determine film thickness, profilometry to measure thickness change across the samples, scanning electron microscopy (SEM), contact angle to measure changes in wetting behavior, and UV-Vis spectroscopy to measure dissolved silica in post etch water. HTW has demonstrated the ability to effective etch both SiO2 and Si3N4, HT-D2O also showed similar etch rates of Si3N4 indicating that a threshold reactive specie concentration is needed to maximize etch rate at a given temperature and additional reactive species do not further increase the etch rate. Because HTW has no hazardous byproducts, high temperature water could become a more environmentally friendly etchant of SiO2 and Si3N4 thin films.
Date: December 2018
Creator: Barclay, Joshua David