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Effects of Disasters on Local Climate Actions: Climate Change Mitigation and Adaptation Actions
This dissertation investigates the effects of natural disasters and political institutions on municipalities' climate change policies. Although most theoretical frameworks on policy adoption highlight the roles of extreme events as exogenous factors influencing policy change, most studies tend to focus on the effects of extreme events on policy change at the national level. Additionally, the existing theoretical frameworks explaining local policy adoption and public service provision do not pay attention to the roles of extreme events in local governments' policy choices. To fill those gaps, this dissertation explores the roles of natural disasters and political institutions on municipal governments' climate change policies. It does this by applying the theory of focusing events to local climate mitigation and adaptation actions. Based on the policy change framework, the political market model, and the institutional collective action frameworks, this dissertation develops and tests hypotheses to examine the effects of natural disasters and political institutions on municipalities' climate mitigation and adaptation policies. The dissertation uses 2010 National League of Cities (NLC) sustainability surveys and the 2010 International City/County Management Association (ICMA) sustainability survey to test the hypotheses. Analytical results show that floods and droughts influence local climate change policies and suggest that local governments …
Date:
December 2017
Creator:
Kim, Kyungwoo
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
"Failure to Yield": Essays
Failure to Yield is a collection of creative nonfiction that explores themes of presence and emotional connection and expression. The seven essays, which include three flash essays, explore the themes by reflecting on such topics as marriage, parent-child relationships and addiction. The collection is woven together by the author's relationships with her parents and children and by her experiences growing up in a small town in Iowa.
Date:
December 2017
Creator:
Siegfried, Cary Ann
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Molecular Dynamics Simulations of the Structure and Properties of Boron Containing Oxide Glasses: Empirical Potential Development and Applications
Potential parameters that can handle multi-component oxide glass systems especially boron oxide are very limited in literature. One of the main goals of my dissertation is to develop empirical potentials to simulate multi-component oxide glass systems with boron oxide. Two approaches, both by introducing the composition dependent parameter feature, were taken and both led to successful potentials for boron containing glass systems after extensive testing and fitting. Both potential sets can produce reasonable glass structures of the multi-component oxide glass systems, with structure and properties in good agreement with experimental data. Furthermore, we have tested the simulation settings such as system size and cooling rate effects on the results of structures and properties of MD simulated borosilicate glasses. It was found that increase four-coordinated boron with decreasing cooling rate and system size above 1000 atoms is necessary to produce converged structure. Another application of the potentials is to simulate a six-component nuclear waste glass, international simple glass (ISG), which was for first time simulated using the newly developed parameters. Structural features obtained from simulations agree well with the experimental results. In addition, two series of sodium borosilicate and boroaluminosilicate glasses were simulated with the two sets of potentials to compare …
Date:
December 2017
Creator:
Deng, Lu
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Exploring the Relationship between Strategic Thinking and Absorptive Capacity: A Proposed Typology
Absorptive capacity plays an important role in the organizational adaptation process. Prior research on absorptive capacity focuses on its role in organizational outcomes such as financial performance, innovation, new product development, etc. Recently, scholars have called for research on factors that influence absorptive capacity. Because absorptive capacity plays a vital role in achieving organizational outcomes, it behooves us to improve our understanding of absorptive capacity and its antecedents to serve both researchers and practitioners. In this investigation, strategic thinking is posited to be a key antecedent of absorptive capacity. Capability theory suggests that strategic thinking is a metaphysical (higher order) capability that influences an organization's absorptive capacity. Combining this argument with Miles and Snow's typology of organizational adaptation process, it is posited that the relationship between strategic thinking and absorptive capacity can be clustered into different "groups." Prospectors, defenders, and analyzers, characterized in Miles and Snow's typology of firms are viewed as distinctive groups that exhibit different relationships between strategic thinking and absorptive capacity. Results from an empirical examination suggest that strategic thinking is positively related to absorptive capacity. The results also suggest that the relationship between these two constructs is different between these groups and that the strategic thinking …
Date:
December 2017
Creator:
Srivastava, Saurabh
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Idiographic Temporal Dynamics of Posttraumatic Stress Disorder (PTSD) Symptom Dimensions in Daily Life
Understanding temporal relations among posttraumatic stress disorder (PTSD) symptom dimensions has received increasing attention in research. However, current findings in this area are limited by group-level approaches, which are based on inter-individual variation. PTSD is a heterogeneous syndrome and symptoms are likely to vary across individuals and time. Thus, it is important to examine temporal relations among PTSD symptom dimensions as dynamic processes and at the level of intra-individual variation. The aim of the present study was to capture temporal dynamics among PTSD symptom dimensions at an individual level using unified structural equation modeling (uSEM). World Trade Center (WTC) 9/11 responders (N = 202) oversampled for current PTSD (18.3% met criteria in past month) were recruited from the Long Island site of the WTC health program. Using ecological momentary assessment (EMA), PTSD symptoms were assessed three times a day over seven consecutive days. The person-specific temporal relations among PTSD symptom dimensions were estimated with individual-level uSEM. For the sample as a whole, hyperarousal played a key role in driving the other three symptom dimensions longitudinally, with the strongest effect in intrusive symptoms. However, daily temporal relations among PTSD symptoms were idiosyncratic. Although hyperarousal was a strong predictor of subsequent symptom …
Date:
December 2017
Creator:
Schuler, Keke
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Simulink® Based Design and Implementation of Wireless Sensor Networks
A wireless sensor network (WSN) is a spatially distributed network used to monitor the physical and environmental conditions such as temperature, pressure, sound, humidity, heat, etc. WSNs can be modeled using different simulation frameworks like OMNeT++, Prowler, Atarraya, PiccSIM, Network Simulator, etc. In this research, Simulink framework was used to model WSN system. The complete WSN consisting of transmitting nodes, communication channel, and receiver nodes are built in the Simulink framework. Orthogonal frequency division multiplexing technique was used to transmit the information. The implemented wireless sensor system behavior is studied using temperature as the measurement parameter at different values of signal to noise ratio. The plots of bit error rate versus signal to noise ratio and frame error rate versus signal to noise ratio are generated in the Simulink framework. It is easy to study the effect of different physical layer parameters on the performance of wireless sensor networks by implementing WSN in the Simulink framework.
Date:
December 2017
Creator:
Nune, Raju
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Three-Dimensional Carbon Nanostructure and Molybdenum Disulfide (MoS2) for High Performance Electrochemical Energy Storage Devices
My work presents a novel approach to fabricate binder free three-dimensional carbon nanotubes/sulfur (3DCNTs/S) hybrid composite by a facile and scalable method increasing the loading amount from 1.86 to 8.33 mg/cm2 highest reported to date with excellent electrochemical performance exhibiting maximum specific energy of ~1233Wh/kg and specific power of ~476W/kg, with respect to the mass of the cathode. Such an excellent performance is attributed to the fact that 3DCNTs offers higher loading amount of sulfur, and confine polysulfide within the structure. In second part of the thesis, molybdenum disulfide (MoS2) is typically studied for three electrochemical energy storage devices including supercapacitors, Li-ion batteries, and hybrid Li-ion capacitors. The intrinsic sheet like morphology of MoS2 provides high surface area for double layer charge storage and a layered structure for efficient intercalation of H+/ Li+ ions. My work demonstrates the electrochemical analysis of MoS2 grown on different substrates including copper (conducting), and carbon nanotubes. MoS2 film on copper was investigated as a supercapacitor electrode in three electrode system exhibiting excellent volumetric capacitance of ~330F/cm3 along with high volumetric power and energy density in the range of 40-80 W/cm3 and 1.6-2.4 mWh/cm3, respectively. Furthermore, we have developed novel binder-free 3DCNTs/ MoS2 as an …
Date:
December 2017
Creator:
Patel, Mumukshu D.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Study of Selected Compositional Techniques Found in Young Ja Lee's Variations Pour Piano "Umma ya, Nuna ya" (1996)
Young Ja Lee (b. 1931) is regarded as one of the most important living female composers in Korea. She leads and contributes to the Korean classical music society as a gifted composer and a dedicated educator. This study focuses on how she has combined Western compositional techniques with elements of Eastern traditional music in some of her compositions, in particular, her Variations pour piano "Umma ya, Nuna ya." An interpretation of her Variations pour piano "Umma ya, Nuna ya" reveals that the composition features many of the particular and sublime aspects of Western compositional techniques in conjunction with traditional Korean music style. This study is an investigation of the interaction and assimilation of these disparate elements. The results of this study may inspire further research into traditional Korean music and bring recognition to important Korean composers, as well as encourage music educators to teach Korean composers' compositions.
Date:
December 2017
Creator:
Shin, Eun Young
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Estimating Thermal Conductivity and Volumetric Specific Heat of a Functionally Graded Material using Photothermal Radiometry
Functionally graded materials (FGMs) are inhomogeneous materials in which the material properties vary with respect to space. Research has been done by scientific community in developing techniques like photothermal radiometry (PTR) to measure the thermal conductivity and volumetric heat capacity of FGMs. One of the problems involved in the technique is to solve the inverse problem, i.e., estimating the thermal properties after the frequency scan has been obtained. The present work involves finding the unknown thermal conductivity and volumetric heat capacity of the FGMs by using finite volume method. By taking the flux entering the sample as periodic and solving the discretized 1-D thermal wave field equation at a frequency domain, one can obtain the complex temperatures at the surface of the sample for each frequency. These complex temperatures when solved for a range of frequencies gives the phase vs frequency scan which can then be compared to original frequency scan obtained from the PTR experiment by using a residual function. Brute force and gradient descent optimization methods have been implemented to estimate the unknown thermal conductivity and volumetric specific heat of the FGMs through minimization of the residual function. In general, the spatial composition profile of the FGMs can …
Date:
December 2017
Creator:
Koppanooru, Sampat Kumar Reddy
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Phenotypic Analysis of Medicago truncatula NPF1.7 Over-Expressing Plants Grown under Different Nitrate Conditions
Plants have many nitrate transporters; in the model legume Medicago truncatula, MtNPF1.7 is among them. MtNPF1.7 is important for M. truncatula growth and it has been established that MtNPF1.7 is a high affinity nitrate transporter. M. truncatula plants with mutations in MtNPF1.7 gene show defects during plants growth, with striking abnormalities in nodule development and root architecture. Nitrogen fixation is an energy expensive process; when legumes have sufficient bioavailable nitrogen like nitrate available, it suppresses nodulation and nitrogen fixation. Previous preliminary results in our lab showed that plants constitutively expressing MtNPF1.7 have a growth phenotype in the absence of nitrate, but no data was available on how M. truncatula plants constitutively expressing MtNPF1.7 are affected by the presence of nitrate. For my research, I confirmed the preliminary results on the growth of M. truncatula plants overexpressing NPF1.7 and examined these plants' phenotypes when nitrate was not provided in the growth media and when it was provided at two different concentrations. Compared with wild type A17, plants constitutively expressing MtNPF1.7 gene grow larger, have more lateral roots and more nodules when grown in the absence of nitrate and when 0.2 mM KNO3 was provided. At 1 mM KNO3, there are fewer …
Date:
December 2017
Creator:
Cai, Jingya
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Employee Satisfaction with Supervisor Support: The Case of Direct Care Workers in Nursing Homes
The nursing home industry has been saturated for decades with culture change initiatives in an effort to improve resident quality of care. The direct care worker (DCW) is considered a critical position to achieving nursing facility quality improvements. Understanding what leads to job satisfaction for DCWs could result in improved resident care. The relationship DCWs have with their direct supervisor or upper-level manager can impact employee satisfaction. The purpose of this research is to identify factors that are associated with DCWs satisfaction with supervisor and management support. Data was obtained from 307 DCWs who were employed at 11 North Texas nursing homes. It was expected that factors affecting satisfaction with direct supervision and upper-level management would differ. In fact, the study found that the antecedents for employee satisfaction with supervisor support were participative decision-making/empowerment, age, information exchange and feedback. Furthermore, participative decision-making/empowerment, perceived competence, staffing, information exchange and feedback were found to affect direct care workers' satisfaction with manager support. In conclusion, this research provides a starting point towards a more holistic view of employee satisfaction with supervisor support by considering the preceding factors and its subsequent effects.
Date:
December 2017
Creator:
Whitaker, Lisa
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Hybrid Hero in Early Modern English Literature: A Synthesis of Classical and Contemplative Heroism
In his Book of the Courtier, Castiglione appeals to the Renaissance notion of self-fashioning, the idea that individuals could shape their identity rather than relying solely on the influence of external factors such as birth, social class, or fate. While other early modern authors explore the practice of self-fashioning—Niccolò Machiavelli, for example, surveys numerous princes identifying ways they have molded themselves—Castiglione emphasizes the necessity of modeling one's-self after a variety of sources, "[taking] various qualities now from one man and now from another." In this way, Castiglione advocates for a self-fashioning grounded in a discriminating kind of synthesis, the generation of a new ideal form through the selective combination of various source materials. While Castiglione focuses on the moves necessary for an individual to fashion himself through this act of discriminatory mimesis, his views can explain the ways authors of the period use source material in the process of textual production. As poets and playwrights fashioned their texts, they did so by consciously combining various source materials in order to create not individuals, as Castiglione suggests, but characters to represent new cultural ideals and values. Early moderns viewed the process of textual, as well as cultural production, as a kind …
Date:
December 2017
Creator:
Ponce, Timothy Matthew
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Doctoral Recital: 2017-11-14 – Jieun Lee, piano
Doctoral recital presented at the UNT College of Music Voertman Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
November 14, 2017
Creator:
Lee, Jieun
Object Type:
Video
System:
The UNT Digital Library
Doctoral Recital: 2017-01-23 – Jennifer Youngs, soprano
Doctoral recital presented at the UNT College of Music Voertman Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
January 23, 2017
Creator:
Youngs, Jennifer (Soprano)
Object Type:
Video
System:
The UNT Digital Library
Doctoral Recital: 2017-01-26 – Brittney Balkcom, flute
Doctoral recital presented at the UNT College of Music Voertman Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
January 26, 2017
Creator:
Balkcom, Brittney
Object Type:
Video
System:
The UNT Digital Library
Doctoral Recital: 2017-01-29 – Lucas Willsie, clarinet
Doctoral recital presented at the UNT College of Music Voertman Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
January 29, 2017
Creator:
Willsie, Lucas
Object Type:
Video
System:
The UNT Digital Library
[Dataset: Matrix-B]
3D dataset model of a matrix for a majiscule sans serif B. The resulting 3D printed model will replicate the historical artifact used to design/cast type during the hand press period. These models are for teaching purposes only and cannot be used to cast type using molten type metal, nor can they be used for printing. This dataset is an individual file and is part of a complete set of teaching tools.
Date:
April 1, 2017
Creator:
Jacobs, Courtney E.; McIntosh, Marcia; O'Sullivan, Kevin M. & Strait, Bob
Object Type:
Dataset
System:
The UNT Digital Library
[Dataset: Composing-Stick]
3D dataset model of a matrix/punch for a composing stick. The resulting 3D printed model will replicate the historical artifact used to set type during the hand press period.
Date:
April 1, 2017
Creator:
Jacobs, Courtney E.; McIntosh, Marcia; O'Sullivan, Kevin M. & Strait, Bob
Object Type:
Dataset
System:
The UNT Digital Library
[Dataset: Jin gang jing xin jing gan ying tu shuo 金剛經心經感應圖說 pp. 31-32]
3D dataset model of a xylographic woodblock containing pages 31-32 of "An Illustrated Explanation of Miraculous Response Appended to the Heart Sutra and Diamond Sutra," an ancient Buddhist text published by Zhu Xuzeng 朱續曾 in 1798. The woodblock is one of 37 held by the University of California Los Angeles (UCLA) Library Special Collections. The block contains 8 lines per half page , 15 characters per line, white block-heart, double borders, a single fish tail (8 行 15 字, 白口, 左右雙邊, 單黑魚尾）
Date:
2017
Creator:
Daniels, Doug
Object Type:
Dataset
System:
The UNT Digital Library
Texas Commission on Environmental Quality Annual Report of Nonfinancial Data: 2017
Report containing non-financial data for the Texas Commission on Environmental Quality during fiscal year 2017, including information on occupied spaces, strategic plan updates, and other related topics and documentation.
Date:
December 7, 2017
Creator:
Texas Commission on Environmental Quality
Object Type:
Report
System:
The Portal to Texas History
Exploring Simscape™ Modeling for Piezoelectric Sensor Based Energy Harvester
This work presents an investigation of a piezoelectric sensor based energy harvesting system, which collects energy from the surrounding environment. Increasing costs and scarcity of fossil fuels is a great concern today for supplying power to electronic devices. Furthermore, generating electricity by ordinary methods is a complicated process. Disposal of chemical batteries and cables is polluting the nature every day. Due to these reasons, research on energy harvesting from renewable resources has become mandatory in order to achieve improved methods and strategies of generating and storing electricity. Many low power devices being used in everyday life can be powered by harvesting energy from natural energy resources. Power overhead and power energy efficiency is of prime concern in electronic circuits. In this work, an energy harvester is modeled and simulated in Simscape™ for the functional analysis and comparison of achieved outcomes with previous work. Results demonstrate that the harvester produces power in the 0 μW to 100 μW range, which is an adequate amount to provide supply to low power devices. Power efficiency calculations also demonstrate that the implemented harvester is capable of generating and storing power for low power pervasive applications.
Date:
May 2017
Creator:
Dhayal, Vandana
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
High School Teachers' Perceptions of Giftedness, Gifted Education, and Talent Development
In the field of gifted education, there is little research on the perceptions of high school teachers of the gifted about giftedness, good gifted education practices, and the nature and needs of gifted learners. The purpose of this study was to form a deeper understanding of how those educators who guide gifted learners out of high school and into adulthood perceive giftedness and gifted education. This qualitative study, conducted in two phases, took place in a large suburban school district with three large high school systems and was focused on the responses of high school teachers to assess their attitudes, feelings, and opinions about the nature and needs of gifted learners using a grounded theory model of analysis. Data collected from the 11 participants in the first phase of the analysis was combined with that collected from the 13 participants in phase two and validated throughout with continual comparison through memoing. Participants reported a general lack of engagement with scholarly work in the gifted education field as well as a dependence on the school district for effective training in classroom practice. Evidence also suggested a view of giftedness among the participants as an inherent quality of some people who needed …
Date:
May 2017
Creator:
Russell, Joseph L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Understanding Antecedents and Outcomes of Co-Creation in Service Innovation Setting
This dissertation uses service-dominant logic to understand customer value creation in service innovation context. Although co-creation became an interesting phenomenon among marketing scholars, the underlying mechanisms of co-creation process are still vague. To fill the gaps in the literature, we draw from S-D logic to understand antecedents and outcome of co-creation to service innovation context. The results of this study show that most of the hypotheses are supported, thus finding support for the overall model of value co-creation.
Date:
May 2017
Creator:
Rokonuzzaman, Md
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Texas Highways, Volume 64, Number 4, April 2017
Monthly travel magazine discussing locations and events in Texas to encourage travel within the state.
Date:
April 2017
Creator:
Texas. Department of Transportation.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History