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  Partner: UNT Libraries
 Degree Level: Master's
In Vitro Investigations of Antibiotic Influences on Nerve Cell Network Responses to Pharmacological Agents
Neuronal networks, derived from mouse embryonic frontal cortex (FC) tissue grown on microelectrode arrays, were used to investigate effects of gentamicin pretreatment on pharmacological response to the L-type calcium channel blocker, verapamil. Gentamicin is a broad spectrum antibiotic used to control bacterial contamination in cell culture. The addition of gentamicin directly to medium affects the pharmacological and morphological properties of the cells in culture. A reproducible dose response curve to verapamil from untreated cultures was established and the mean EC50 was calculated to be 1.5 ± 0.5 μM (n=10). 40 μM bicuculline was added to some cell cultures to stabilize activity and verapamil dose response curves were performed in presence of bicuculline, EC50 1.4 ± 0.1 μM (n=9). Statistical analysis showed no significant difference in verapamil EC50s values obtained in presence of bicuculline and hence the data was combined and a standard verapamil EC50 was calculated as 1.4 ± 0.13 μM (n=19). This EC50 was then used to compare verapamil EC50s obtained from neuronal cell cultures with chronic and acute exposures to gentamicin. FC cultures (21- 38 days old) were found to be stable in presence of 2300 μM gentamicin. The recommended concentration of gentamicin for contamination control is 5uL /1 ml medium (108 μM). At this concentration, the verapamil EC50 shifted from 1.4 ± 0.13 μM to 0.9 ± 0.2 μM. Given the limited data points and only two complete CRCs, statistical comparison was not feasible. However, there is a definite trend that shows sensitization of cells to verapamil in presence of gentamicin. The cultures exposed to 108 μM gentamicin for 5 days after seeding showed loss of adhesion and no data could be collected for pharmacological analysis. To conclude, acute gentamicin exposure of neuronal cell cultures causes increased sensitivity to verapamil and chronic or long term exposure to gentamicin may cause loss of adhesion of the cell culture by affecting the glial growth. The effect of chronic exposure to gentamicin on pharmacological responses to verapamil remains inconclusive. digital.library.unt.edu/ark:/67531/metadc699991/
Electromagnetic Shielding Properties of Iron Oxide Impregnated Kenaf Bast Fiberboard
The electromagnetic shielding effectiveness of kenaf bast fiber based composites with different iron oxide impregnation levels was investigated. The kenaf fibers were retted to remove the lignin and extractives from the pores in fibers, and then magnetized. Using the unsaturated polyester and the magnetized fibers, kenaf fiber based composites were manufactured by compression molding process. The transmission energies of the composites were characterized when the composite samples were exposed under the irradiation of electromagnetic (EM) wave with a changing frequency from 9 GHz to 11 GHz. Using the scanning electron microscope (SEM), the iron oxide nanoparticles were observed on the surfaces and inside the micropore structures of single fibers. The SEM images revealed that the composite’s EM shielding effectiveness was increased due to the adhesion of the iron oxide crystals to the kenaf fiber surfaces. As the Fe content increased from 0% to 6.8%, 15.9% and 18.0%, the total surface free energy of kenaf fibers with magnetizing treat increased from 44.77 mJ/m2 to 46.07 mJ/m2, 48.78 mJ/m2 and 53.02 mJ/m2, respectively, while the modulus of elasticity (MOE) reduced from 2,875 MPa to 2,729 MPa, 2,487 MPa and 2,007 MPa, respectively. Meanwhile, the shielding effectiveness was increased from 30-50% to 60-70%, 65-75% and 70-80%, respectively. digital.library.unt.edu/ark:/67531/metadc699998/
The Effects of Model Prompts on Joint Attention Initiations in Children with Autism
The general purpose of the current study was to evaluate the effects of minimally intrusive prompting procedures and preferred stimuli on protodeclarative joint attention initiations in children diagnosed with autism spectrum disorder (ASD). Two boys and one girl diagnosed with ASD participated. The experimenter provided attention and social interaction following protodeclarative initiations throughout all phases of the study. During intervention, a model prompt was delivered every 30 s if the participant failed to initiate a bid for joint attention. Results for the first participant show that a model prompt was sufficient to increase the rate of protodeclarative initiations across stimulus sets. Generalization was seen across sets, but not across environments. Subsequently, the model prompt was sufficient to increase the rate of protodeclarative initiations across sets in a second setting (classroom). Results for the second participant are inconclusive. Data collected during the initial baseline condition show that she engaged in an incompatible verbal response across sets. When pictorial stimuli depicting highinterest items and activities were introduced, the rate of protodeclarative initiations increased over time. We then returned to original baseline condition and saw an initial decrease, followed by a steady increase in the rate of protodeclarative initiations. The third participant withdrew prematurely due to medical reasons. The findings of the current study show that minimally intrusive prompts and natural consequences may be sufficient to establish protodeclarative initiations in children. However, this finding may be limited to only those children for whom social interactions already function as reinforcers. digital.library.unt.edu/ark:/67531/metadc699952/
Cowboys, “Queers,” and Community: the Aids Crisis in Houston and Dallas, 1981-1996
This thesis examines the response to the AIDS crisis in Houston and Dallas, two cities in Texas with the most established gay communities highest number of AIDS incidences. Devoting particular attention to the struggles of the Texas’ gay men, this work analyzes the roadblocks to equal and compassionate care for AIDS, including access to affordable treatment, medical insurance, and the closure of the nation’s first AIDS hospital. In addition, this thesis describes the ways in which the peculiar nature of AIDS as an illness transformed the public perception of sickness and infection. This work contributes to the growing study of gay and lesbian history by exploring the transformative effects of AIDS on the gay community in Texas, a location often forgotten within the context of the AIDS epidemic. digital.library.unt.edu/ark:/67531/metadc699956/
The Power of Perception: Women and Politics at the Early Georgian Court
The early Georgian period illustrates how the familial dynamic at court affected women’s opportunity to exert political influence. The court represented an important venue that allowed women to declare a political affiliation and to participate in political issues that suited their interests. Appearances often at variance with reality allowed women to manipulate and test their political abilities in order to have the capability to exercise any possible power. Moreover, some women developed political alliances and relationships that supported their own interests. The family structure of the royal household affected how much influence women had. The perception of holding power permitted certain women to behave politically. This thesis will demonstrate that the distinction between appearances and reality becomes vital in assessing women at the early Georgian court by examining some women’s experiences at court during the reigns of the first two Georges. In some cases, the perceived power of a courtier had a real basis, and in other instances, it gave them an opportunity to assess the extent of their political power. Women’s political participation has been underestimated during the early Georgian period, while well-documented post-1760. digital.library.unt.edu/ark:/67531/metadc699945/
Glass Forming Ability, Magnetic Properties, and Mechanical Behavior of Iron-Based and Cobalt-Based Metallic Glasses
Lack of crystalline order and microstructural features such as grain/grain-boundary in metallic glasses results in a suite of remarkable attributes including very high strength, close to theoretical elasticity, high corrosion and wear resistance, and soft magnetic properties. In particular, low coercivity and high permeability of iron and cobalt based metallic glass compositions could potentially lead to extensive commercial use as magnetic heads, transformer cores, circuits and magnetic shields. In the current study, few metallic glass compositions were synthesized by systematically varying the iron and cobalt content. Thermal analysis was done and included the measurement of glass transition temperature, crystallization temperature, and the enthalpies of relaxation and crystallization. Magnetic properties of the alloys were determined including saturation magnetization, coercivity, and Curie temperature. The coercivity was found to decrease and the saturation magnetization was found to increase with the increase in iron content. The trend in thermal stability, thermodynamic properties, and magnetic properties was explained by atomic interactions between the ferromagnetic metals and the metalloids atoms in the amorphous alloys. Mechanical behavior of iron based metallic glasses was evaluated in bulk form as well as in the form of coatings. Iron based amorphous powder was subjected to high power mechanical milling and the structural changes were evaluated as a function of time. Using iron-based amorphous powder precursor, a uniform composite coating was achieved through microwave processing. The hardness, modulus, and wear behavior of the alloys were evaluated using nano-indentation. digital.library.unt.edu/ark:/67531/metadc699947/
The Role of the Actin Cytoskeleton in Asymmetric Cell Division in Maize
Stomata are specialized plant structures required for gaseous exchange with the outer environment. During stomata formation, the cytoskeleton plays an important role in controlling the division of the individual cells leading to the generation of the stomata complex. Two mutants that affect microfilament and microtubule organization in subsidiary mother cells include brk1 and dcd1. While only 20% of the subsidiary cells in the brk1 and dcd1 single mutants are abnormally shaped, it was reported that there is a synergistic effect between the brk1 and dcd1 mutations in the brk1; dcd1 double mutant since 100% of the subsidiary cells are abnormal. The focus of this research is to try to understand this synergistic effect by investigating the actin cytoskeleton and nuclear position in the single and double mutants. The reported results include the observation that the size of actin patch was largest in the wild-type subsidiary mother cells (SMCs) and smallest in dcd1 and brk1; dcd1 SMCs and that brk1 and brk1; dcd1 double mutants had fewer actin patches than wild-type and dcd1 SMCs. Additionally, we observed that some SMCs that did not have actin patches still underwent nuclear migration suggesting that nuclear migration may not be solely dependent on actin patch formation. Finally, during SMC cytokinesis, a large percentage of double mutant (brk1; dcd1) cells showed an off-track development of the phragmoplast as compared to the single mutants and the wild-type plant explaining the large number of abnormally shaped subsidiary cells in the double mutants. digital.library.unt.edu/ark:/67531/metadc699951/
Evidence for Multiple Functions of a Medicago Truncatula Transporter
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Legumes play an important role in agriculture as major food sources for humans and as feed for animals. Bioavailable nitrogen is a limiting nutrient for crop growth. Legumes are important because they can form a symbiotic relationship with soil bacteria called rhizobia that results in nitrogen-fixing root nodules. In this symbiosis, rhizobia provide nitrogen to the legumes and the legumes provide carbon sources to the rhizobia. The Medicago truncatula NPF1.7/NIP/LATD gene is essential for root nodule development and also for proper development of root architecture. Work in our lab on the MtNPF1.7/MtNIP/LATD gene has established that it encodes a nitrate transporter and strongly suggests it has another function. Mtnip-1/latd mutants have pleiotropic defects, which are only partially explained by defects in nitrate transport. MtNPF1.7/NIP/LATD is a member of the large and diverse NPF/NRT1(PTR) transporter family. NPF/NRT1(PTR) members have been shown to transport other compounds in addition to nitrate: nitrite, amino acids, di- and tri-peptides, dicarboxylates, auxin, abscisic acid and glucosinolates. In Arabidopsis thaliana, the AtNPF6.3/NRT1.1( CHL1) transporter was shown to transport auxin as well as nitrate. Atchl1 mutants have defects in root architecture, which may be explained by defects in auxin transport and/or nitrate sensing. Considering the pleiotropic phenotypes observed in Mtnip-1/latd mutant plants, it is possible that MtNPF1.7/NIP/LATD could have similar activity as AtNPF6.3/NRT1.1(CHL1). Experimental evidence shows that the MtNPF1.7/NIP/LATD gene is able to restore nitrate-absent responsiveness defects of the Atchl1-5 mutant. The constitutive expression of MtNPF1.7/NIP/LATD gene was able to partially, but not fully restore the wild-type phenotype in the Atchl1-5 mutant line in response to auxin and cytokinin. The constitutive expression of MtNPF1.7/NIP/LATD gene affects the lateral root density of wild-type Col-0 plants differently in response to IAA in the presence of high (1mM) or low (0.1 mM) nitrate. MtNPF1.7/NIP/LATD gene expression is not regulated by nitrate at the concentrations tested and MtNPF1.7/NIP/LATD does not regulate the nitrate-responsive MtNRT2.1 gene. Mtnip-1 plants have an abnormal gravitropic root response implicating an auxin defect. Together with these results, MtNPF1.7/NIP/LATD is associated with nitrate and auxin; however, it does not act in a homologous fashion as AtNPF6.3/NRT1.1(CHL1) does in A. thaliana. digital.library.unt.edu/ark:/67531/metadc699903/
An Assessment of a Hospice and Palliative Care Partnership Program
This project attempts to describe how a hospice and palliative care partnership program works. Through the assessment of one such program, the researcher sought to find out the essential components of the partnership including how the two partner organizations interact and work together. Data was collected using various methods: document review of organization documents such as newsletters, annual or quarterly reports, brochures and other available literature e.g. materials on organizations’ website and on social media; in-depth interviews with stakeholders of both organizations that included staff and board members; observation of staff working; and participant observation during organization events. The findings of the research shows that in order for organizations to have an effective partnership program in place, both partners need to have strong leadership in place, possess a willingness to learn from each other, maintain regular communication, and visit each other regularly. With this in place, several outcomes of the program are likely such as: increasing advocacy for hospice and palliative care, increasing visibility of the organizations both nationally and internationally, and provides an opportunity for organizations to network with other organizations in their locality in order to achieve partnership objectives. The study further reveals that global collaborations in the field of hospice and palliative care began with the advent of the international hospice movement. The assessment of this hospice partnership demonstrates how organizations can establish working relationships and the results likely to come out of such an initiative. digital.library.unt.edu/ark:/67531/metadc699969/
Evaluation of Program Effectiveness: a Look at the Bedford Police Department’s Strategy Towards Repeat Victimization in Domestic Violence and Mental Health
The primary goal of this study was to evaluate the effectiveness of a program being run by the Bedford Police Department’s Repeat Victimization Unit on domestic violence and mental health and mental retardation. The study sought to determine whether the program was effective in reducing instances of repeat victimization in domestic violence and MHMR victims. Additionally the program investigated whether or not the program was effective at reducing victimization severity, and which demographic could be identified as the most victimized. Participants consisted of 157 domestic violence and MHMR victims in the city of Bedford, Tx between November 11, 2012 to July 30, 2013. Findings indicate that levels of repeat victimization for domestic violence and MHMR are relatively low regardless of whether the victim received services through the repeat victimization program or not. Additionally the severity of these repeat victimizations remains relatively constant regardless of whether services were received through the program or not. Implications and findings are discussed. digital.library.unt.edu/ark:/67531/metadc699900/
Companion to the Gods, Friend to the Empire: the Experiences and Education of the Emperor Julian and How It Influenced His Reign 361-363 Ad
This thesis explores the life and reign of Julian the Apostate the man who ruled over the Roman Empire from A.D. 361-363. The study of Julian the Apostate’s reign has historically been eclipsed due to his clash with Christianity. After the murder of his family in 337 by his Christian cousin Constantius, Julian was sent into exile. These emotional experiences would impact his view of the Christian religion for the remainder of his life. Julian did have conflict with the Christians but his main goal in the end was the revival of ancient paganism and the restoration of the Empire back to her glory. The purpose of this study is to trace the education and experiences that Julian had undergone and the effects they it had on his reign. Julian was able to have both a Christian and pagan education that would have a lifelong influence on his reign. Julian’s career was a short but significant one. Julian restored the cities of the empire and made beneficial reforms to the legal, educational, political and religious institutions throughout the Empire. The pagan historians praised him for his public services to the empire while the Christians have focused on his apostasy and “persecution” of their faith. With his untimely death in Persia, Julian’s successor Jovian, reversed most of his previous reforms and as such left Julian as the last pagan emperor of the Roman Empire. digital.library.unt.edu/ark:/67531/metadc699909/
Psychosocial Mediators of the Fitness-depression Relationship Within Adolescents
Adolescence is a developmental period during which boys and girls are at high risk of developing major or minor depression. Increases in fitness have been associated with lower levels of depressive symptomatology and improvements in psychological well-being, yet the mechanisms that underlie this relationship have not been thoroughly examined. Three such psychosocial variables (i.e. body satisfaction, social physique anxiety, and physical activity self-efficacy) have been identified as possible mechanisms and although they have theoretical support, additional research is needed to demonstrate empirically the potential effects of these variables. Self-report measures were used to assess the psychosocial variables and the Progressive Aerobic Cardiovascular Endurance Run (PACER) in conjunction with age, Body Mass Index [BMI], and sex was used to determine an estimate of aerobic capacity (VO2max). Path analyses were used to test the proposed model using version 6.2 EQS Multivariate Software. Results of study revealed that the boys’ and girls’ depressive scores were determined based on the extent that their fitness levels improved their satisfaction with their bodies and lowered the anxiety they experience in relation to real or imagined judgments of their physique. Although all pathways in the model were significant, with the exception of physical activity self-efficacy to depression, differences emerged between the boys and girls in terms of the strength of some of the relations amongst the variables. Limitations include restricted generalizability, self-report measures, and cross-sectional design. Results have implications for individuals in a context intended to improve physical and psychosocial well-being of adolescents. digital.library.unt.edu/ark:/67531/metadc699904/
Caring for Cancer: Understanding the Access and Perceptions of Psychosocial Cancer Services in North Texas
It is estimated that nearly 14.5 million Americans are living with cancer today. A commonly overlooked component to quality cancer care, as defined by the Institute of Medicine, is the role of psychological and social support. Better known as psychosocial support, these needs reflect a broad spectrum of obstacles or assets in an individual’s personal life that may help or hinder their healing experience. Some psychosocial examples include coping skills, transportation to medical appointments, or appropriate knowledge to mitigate the physical impacts of the cancer process. Research has shown that by addressing these potential needs, a better health outcome may be achieved for cancer patients. Through participant observation at local psychosocial service establishments and through semi-structured interviews with service providers and adults diagnosed with cancer living in the Dallas-Fort Worth region, this thesis research seeks to explore how local cancer patients are learning of psychosocial services available to them, what barriers may exist in accessing these services, and what individuals may be doing to address their psychosocial needs, both formally or informally. Results yielded recommendations for local psychosocial providers to adjust their marketing of services and kinds of services offered as well as yielded recommendations for future academic research. digital.library.unt.edu/ark:/67531/metadc699920/
Company A, Nineteenth Texas Infantry, a History of a Small Town Fighting Unit
I focus on Company A of the Nineteenth Texas Infantry, C.S.A., and its unique status among other Confederate military units. The raising of the company within the narrative of the regiment, its battles and campaigns, and the post-war experience of its men are the primary focal points of the thesis. In the first chapter, a systematic analysis of various aspects of the recruit’s background is given, highlighting the wealth of Company A’s officers and men. The following two chapters focus on the campaigns and battles experienced by the company and the praise bestowed on the men by brigade and divisional staff. The final chapter includes a postwar analysis of the survivors from Company A, concentrating on their locations, professions, and contributions to society, which again illustrate the achievements accomplished by the veterans of this unique Confederate unit. As a company largely drawn from Jefferson, Texas, a growing inland port community, Company A of the Nineteenth Texas Infantry differed from other companies in the regiment, and from most units raised across the Confederacy. Their unusual backgrounds, together with their experiences during and after the war, provide interesting perspectives on persistent questions concerning the motives and achievements of Texas Confederates. digital.library.unt.edu/ark:/67531/metadc699958/
Cultural Exchange: the Role of Stanislavsky and the Moscow Art Theatre’s 1923 and 1924 American Tours
The following is a historical analysis on the Moscow Art Theatre’s (MAT) tours to the United States in 1923 and 1924, and the developments and changes that occurred in Russian and American theatre cultures as a result of those visits. Konstantin Stanislavsky, the MAT’s co-founder and director, developed the System as a new tool used to help train actors—it provided techniques employed to develop their craft and get into character. This would drastically change modern acting in Russia, the United States and throughout the world. The MAT’s first (January 2, 1923 – June 7, 1923) and second (November 23, 1923 – May 24, 1924) tours provided a vehicle for the transmission of the System. In addition, the tour itself impacted the culture of the countries involved. Thus far, the implications of the 1923 and 1924 tours have been ignored by the historians, and have mostly been briefly discussed by the theatre professionals. This thesis fills the gap in historical knowledge. digital.library.unt.edu/ark:/67531/metadc699929/
Optimization of Novel Culturing and Testing Procedures for Acute Effects on Acartia Tonsa and Tisbe Biminiensis
Copepods comprise an ecologically important role in freshwater and marine ecosystems, which is why they are often considered an important ecotoxicological model organism. The International Organization for Standardization’s (ISO) 14669 protocol is the only guideline for the determination of acute toxicity in three European marine copepod species: Acartia tonsa. The goal of this project was to assess the feasibility of establishing and maintaining cultures of Acartia tonsa, as well as to refine current culturing and egg separation methods. Initial culture methodology proved difficult for consistent production of eggs and collection of nauplii. The development of an airlift system for the separation of eggs from nauplii and adults, based on size, successfully increased the availability of eggs, nauplii and adults. The sensitivity and relative conditions of the copepod species was assessed by running a series of 48h acute toxicity tests with the reference toxicants 3,5-dichlorophenol, 4,4’-methylenebis(2,6-di-tert-butylphenol. The acute 48 hour median lethal dose concentration (LC50), the no observed effect concentration (NOEC), and the lowest observed effect concentration (LOEC) was analyzed for the three reference compounds for of A. tonsa. digital.library.unt.edu/ark:/67531/metadc699989/
Design Space Exploration of Domain Specific Cgras Using Crowd-sourcing
CGRAs (coarse grained reconfigurable array architectures) try to fill the gap between FPGAs and ASICs. Over three decades, the research towards CGRA design has produced number of architectures. Each of these designs lie at different points on a line drawn between FPGAs and ASICs, depending on the tradeoffs and design choices made during the design of architectures. Thus, design space exploration (DSE) takes a very important role in the circuit design process. In this work I propose the design space exploration of CGRAs can be done quickly and efficiently through crowd-sourcing and a game driven approach based on an interactive mapping game UNTANGLED and a design environment called SmartBricks. Both UNTANGLED and SmartBricks have been developed by our research team at Reconfigurable Computing Lab, UNT. I present the results of design space exploration of domain-specific reconfigurable architectures and compare the results comparing stripe vs mesh style, heterogeneous vs homogeneous. I also compare the results obtained from different interconnection topologies in mesh. These results show that this approach offers quick DSE for designers and also provides low power architectures for a suite of benchmarks. All results were obtained using standard cell ASICs with 90 nm process. digital.library.unt.edu/ark:/67531/metadc699959/
The Influence of Perceived Stress on Insulin Resistance in Adults with Type 2 Diabetes
Objective: To identify whether perceived stress is a risk-factor for higher cortisol levels and greater insulin resistance in Type 2 diabetic patients, using data from participants with and without diabetes in the National Survey of Midlife Development in the United States (MIDUS), specifically MIDUS II, Project 4. The following hypotheses were tested: (H1a) greater perceived stress would be associated with higher cortisol for Type 2 diabetic participants, (H1b) the perceived stress/cortisol relationship would be stronger for people with Type 2 diabetes than for those without it, (H2) greater perceived stress would be associated with higher Homeostatic Model Assessment-Insulin Resistance (HOMA-IR, insulin-resistance) for Type 2 diabetic participants, (H3a) subjective well-being would moderate the perceived stress/insulin resistance relationship for Type 2 diabetic participants, and (H3b) depression would moderate the perceived stress/insulin resistance relationship for Type 2 diabetic participants. Method: MIDUS, a longitudinal study of over 7,000 American adults, explores biopsychosocial factors that could contribute to variance in mental/physical health. Only complete data were utilized. Type 2 participants (n=115) consisted of 54 males and 62 females ranging in age from 36 to 81 years. Non-diabetic participants (n=1097) consisted of 470 males and 627 females ranging in age from 34 to 84 years. Results: None of the predicted relationships were statistically significant. Waist to hip ratio was significantly related to insulin resistance (r = .31, p = .001). Conclusions: Future studies should collect information about the type and duration of stressors in addition to perceptions about stress for those with Type 2 diabetes. digital.library.unt.edu/ark:/67531/metadc699935/
Optimal Sensor Placement for Structural Health Monitoring
In large-scale civil structures, a limited number of sensors are placed to monitor the health of civil structures to reduce maintenance, communication and energy costs. In this thesis, the problem of optimal sensor location placement to infer the health of civil structures is explored. First, a comparative study of approaches from the fields of control engineering and civil engineering is conducted . The widely used civil engineering approaches such as effective independence (EI) and modal assurance criterion (MAC) have limitations because of the negligence of modes and damping parameters. On the other hand, control engineering approaches consider the entire system dynamics using impulse response-type sensor measurement data. Such inference can be formulated as an estimation problem, with the dynamics formulated as a second-order differential equation. The comparative study suggests that damping dynamics play significant impact to the selection of best sensor location---the civil engineering approaches that neglect the damping dynamics lead to very different sensor locations from those of the control engineering approaches. In the second part of the thesis, an initial attempt to directly connect the topological graph of the structure (that defines the damping and stiffness matrices) and the second-order dynamics is conducted. digital.library.unt.edu/ark:/67531/metadc700010/
High-Density Polyethylene/Peanut Shell Biocomposites
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A recent trend in the development of renewable and biodegradable materials has led to the development of composites from renewal sources such as natural fibers. This agricultural activity generates a large amount of waste in the form of peanut shells. The motivation for this research is based on the utilization of peanut shells as a viable source for the manufacture of biocomposites. High-density polyethylene (HDPE) is a plastic largely used in the industry due to its durability, high strength to density ratio, and thermal stability. This research focuses in the mechanical and thermal properties of HDPE/peanut shell composites of different qualities and compositions. The samples obtained were subjected to dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), and mechanical tensile strength tests. TO prepare the samples for analysis, the peanut shells were separated into different mesh sizes and then mixed with HDPE at different concentrations. The results showed that samples with fiber size number 10 exhibited superior strength modulus of 1.65 GPa versus results for HDPE alone at 1.32 GPa. The analysis from the previous experiments helped to determine that the fiber size number 10 at 5%wt. ratio in HDPE provides the most optimal mechanical and thermal results. From tensile tests the highest modulus of elasticity of 1.33 GPa was achieved from the samples of peanut shells size number 10 in HDPE at 20%wt. ratio, while the results for HDPE alone were only of 0.8 GPa. The results proved the hypothesis that the addition of peanut shells to HDPE enhances both the thermal and mechanical properties of the composite. digital.library.unt.edu/ark:/67531/metadc700037/
Regulation of Alternative Sigma Factors During Oxidative and Ph Stresses in the Phototroph Rhodopseudomonas Palustris
Rhodopseudomonas palustris is a metabolically versatile phototrophic α-proteobacterium. The organism experiences a wide range of stresses in its environment and during metabolism. The oxidative an pH stresses of four ECF (extracytoplasmic function) σ-factors are investigated. Three of these, σ0550, σ1813, and σ1819 show responses to light-generated singlet oxygen and respiration-generated superoxide reactive oxygen species (ROS). The EcfG homolog, σ4225, shows a high response to superoxide and acid stress. Two proteins, one containing the EcfG regulatory sequence, and an alternative exported catalase, KatE, are presented to be regulated by σ4225. Transcripts of both genes show similar responses to oxidative stress compared to σ4225, indicating it is the EcfG-like σ-factor homolog and controls the global stress response in R. palustris. digital.library.unt.edu/ark:/67531/metadc700009/
Networking and Decentralized Control in Layered Networks: a Theoretical Study and Test-bed Development
Layered structures are commonly used in communication systems, but their roles in decentralized control are not understood well. In the first part of this thesis, a theoretical study of consensus (a typical decentralized control task) in layered structures is conducted. The unique graph topology approach permits explicit characterization of consensus performance based on simple graphical characteristics of MLMG structures. In the second part of this thesis, a generic LEGO test-bed to mimic multi-domain communication with layered structures is described. A search-and-rescue scenario is implemented to demonstrate the use of the test-bed. digital.library.unt.edu/ark:/67531/metadc700084/
Measuring Biomarkers From Dried Blood Spots Utilizing Bead-based Multiplex Technology
Dried blood spots is an alternative method to collect blood samples from research subjects. However, little is known about how hemoglobin and hematocrit affect bead-based multiplex assay performance. The purpose of this study was to determine how bead-based multiplex assays perform when analyzing dried blood spot samples. A series of four experiments outline the study each with a specific purpose. A total of 167 subject samples were collected and 92 different biomarkers were measured. Median fluorescence intensity results show a positive correlation between filtered and non-filtered samples. Utilizing a smaller quantity of sample results in a positive correlation to a larger sample. Removal of hemoglobin from the dried blood spot sample does not increase detection or concentration of biomarkers. Of the 92 different biomarkers measured 56 were detectable in 100-75% of the attempted samples. We conclude that blood biomarkers can be detected using bead-based multiplex assays. In addition, it is possible to utilize a smaller quantity of sample while avoiding the use of the entire sample, and maintaining a correlation to the total sample. While our method of hemoglobin was efficient it also removed the biomarkers we wished to analyze. Thus, an alternative method is necessary to determine if removing hemoglobin increases concentration of biomarkers. More research is necessary to determine if the biomarkers measured in this study can be measured over time or within an experimental model. digital.library.unt.edu/ark:/67531/metadc699876/
Teaching Fundamentals of Digital Logic Design and Vlsi Design Using Computational Textiles
This thesis presents teaching fundamentals of digital logic design and VLSI design for freshmen and even for high school students using e-textiles. This easily grabs attention of students as it is creative and interesting. Using e-textiles to project these concepts would be easily understood by students at young age. This involves stitching electronic circuits on a fabric using basic components like LEDs, push buttons and so on. The functioning of these circuits is programmed in Lilypad Arduino. By using this method, students get exposed to basic electronic concepts at early stage which eventually develops interest towards engineering field. digital.library.unt.edu/ark:/67531/metadc699874/
Capital Ships, Commerce, and Coalition: British Strategy in the Mediterranean Theater, 1793
In 1793, Great Britain embarked on a war against Revolutionary France to reestablish a balance of power in Europe. Traditional assessments among historians consider British war planning at the ministerial level during the First Coalition to be incompetent and haphazard. This work reassesses decision making of the leading strategists in the British Cabinet in the development of a theater in the Mediterranean by examining political, diplomatic, and military influences. William Pitt the Younger and his controlling ministers pursued a conservative strategy in the Mediterranean, reliant on Allies in the region to contain French armies and ideas inside the Alps and the Pyrenees. Dependent on British naval power, the Cabinet sought to weaken the French war effort by targeting trade in the region. Throughout the first half of 1793, the British government remained fixed on this conservative, traditional approach to France. However, with the fall of Toulon in August of 1793, decisions made by Admiral Samuel Hood in command of forces in the Mediterranean radicalized British policy towards the Revolution while undermining the construct of the Coalition. The inconsistencies in strategic thought political decisions created stagnation, wasting the opportunities gained by the Counter-revolutionary movements in southern France. As a result, reinvigorated French forces defeated Allied forces in detail in the fall of 1793. digital.library.unt.edu/ark:/67531/metadc699881/
Kinetic Investigation of Atomic Hydrogen with Sulfur-containing Species
The reactions of atomic hydrogen with methanethiol and that of atomic hydrogen with carbon disulfide were studied experimentally using flash-photolysis resonance-fluorescence techniques. Rate constants were determined over a range of temperatures and pressures, and through analysis and comparison to theoretical work details of the reactions were ascertained. digital.library.unt.edu/ark:/67531/metadc699887/
The Behavioral Economics of Effort
Although response effort is considered a dimension of the cost to obtain reinforcement, little research has examined the economic impact of effort on demand for food. The goal of the present study was to explore the relationship between effort and demand. Three Sprague Dawley rats were trained to press a force transducer under a series of fixed-ratio schedules (1, 10, 18, 32, 56, 100, 180, 320, and 560) under different force requirements (5.6 g and 56 g). Thus, nominal unit price (responses / food) remained constant while minimal response force requirements varied. Using a force transducer allowed the measurement of responses failing to meet the minimal force requirement (i.e. “subcriterion responses”), an advantage over prior approaches using weighted levers to manipulate effort. Consistent with prior research, increasing the unit price decreased food consumption, and raising minimum force requirements further reduced demand for food. Additionally, increasing the force requirement produced subcriterion responses. Analysis indicated that subcriterion responses did not create incidental changes in unit price. Obtained force data revealed that including obtained forces in unit price calculations provided better predictions of consumption when compared to using criterion force requirements. digital.library.unt.edu/ark:/67531/metadc699857/
From Brecht to Butler: an Analysis of Dirty Grrrls
“From Brecht to Butler: An Analysis of Dirty Grrrls” is a production centered thesis focusing on the image of the mudflap girl. The study examines the graduate production Dirty Grrrls as a form of praxis intersecting the mudflap girl, the theory of gender performativity, and Brechtian methodology. As a common yet unexplored symbol of hypersexual visual culture in U.S. American society, the mudflap girl acts as a relevant subject matter for both the performance and written portion of the study. Through the production, mudflap girl materializes at the meeting point of the terms performance and performativity. The written portion of this project examines this intersection and discusses the productive cultural work accomplished on the page and on the stage via live embodiment of performativity. digital.library.unt.edu/ark:/67531/metadc700079/
"Stealing Dreams" and Other Stories
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The critical preface, "Learning to Break the Rules" discusses workshop rules as guidelines, as well as how and why I learned to break them. The creative portion of this thesis is made up of eight short stories: "The Many Incarnations of Blazer Chief," "Anna's Monsters," "The Pecan Tree's Daughter," "When the Seas Emptied," "The Umbrella Thief," "How to Forget," "Fracture," and "Stealing Dreams." digital.library.unt.edu/ark:/67531/metadc700046/
Vickery Meadow Community Needs Assessment
This study represents a community needs assessment conducted for Trans.lation Vickery Meadow, a community-based organization in a North Dallas community, Vickery Meadow. Vickery Meadow is a community where refugee resettlement agencies place incoming clients, and therefore, there is a focus on immigrants and refugees in this study. Using theoretical conceptions of development, immigration policy, and the refugee resettlement process, this project measured residential perceptions of Vickery Meadow, the operations of Trans.lation Vickery Meadow, and overall community needs. Also included are perceptions of Trans.lation Vickery Meadow members concerning community needs and the operations of Trans.lation. Recommendations are made based upon research and conclusions from fieldwork. digital.library.unt.edu/ark:/67531/metadc699942/
Psychopathic Traits and Insecure Attachment Patterns in Community-based Subgroups
There is a growing body of research on psychopathic traits in non-clinical populations. This emerging research has documented the prevalence of psychopathic traits in the general population and demonstrated that psychopathy has a similar latent structure as well as similar correlates (e.g., violent behavior, alcohol abuse, and lower intelligence) to forensic/offender samples. Relatedly, there is strong evidence insecure attachment patterns in adulthood are associated with many personality disorders, including psychopathy, but only a few studies have examined the relationship between attachment and psychopathic traits in non-clinical samples (albeit, convenience samples of college students). Thus, two aims of the current study are to: 1) describe and explore the manifestation and expression of psychopathic traits in a large, community-based sample and 2) examine associations between adult attachment disturbances and psychopathic traits in diverse sociodemographic subgroups. Using a cross-sectional design, results showed mean-level psychopathy factor score differences existed only when considering single sociodemographic factors (e.g., age), not an interaction of those factors. Psychopathy factor profiles were also consistent across groups, with higher levels of lifestyle followed by interpersonal, affective, and antisocial traits reported. Regarding the second aim, findings indicated support for the positive association between disturbed attachment patterns in adult relationships and psychopathic traits, although these associations differed in males and females of different age groups. Finally, there was some support for attachment processes acting as a social development pathway toward psychopathy, as insecure attachments in adulthood partially mediated the relationships between age and interpersonal, affective, and lifestyle traits of psychopathy. digital.library.unt.edu/ark:/67531/metadc699993/
Control and Automation of a Heat Shrink Tubing Process
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Heat shrink tubing is used to insulate wire conductors, protect wires, and to create cable entry seals in wire harnessing industries. Performing this sensitive process manually is time consuming, the results are strongly dependent on the operator’s expertise, and the process presents safety concerns. Alternatively, automating the process minimizes the operators’ direct interaction, decreases the production cost over the long term, and improves quantitative and qualitative production indicators dramatically. This thesis introduces the automation of a heat shrink tubing prototype machine that benefits the wire harnessing industry. The prototype consists of an instrumented heat chamber on a linear positioning system, and is fitted with two heat guns. The chamber design allows for the directing of hot air from the heat guns onto the wire harness uniformly through radially-distributed channels. The linear positioning system is designed to move the heat chamber along the wire harness as the proper shrinkage temperature level is reached. Heat exposure time as a major factor in the heat shrink tubing process can be governed by controlling the linear speed of the heat chamber. A control unit manages the actuator position continuously by measuring the chamber’s speed and temperature. A model-based design approach is followed to design and test the controller, and MATLAB/Simulink is used as the simulation environment. A programmable logic controller is selected as the controller implementation platform. The control unit performance is examined and its responses follow the simulation results with adequate accuracy. digital.library.unt.edu/ark:/67531/metadc699928/
The Measurement and Enhancement of Rapport Between Behavioral Therapists and Children with Autism
Rapport has been acknowledged as an important variable in therapeutic contexts. The current evaluation defined and assessed rapport quality between children with autism and behavioral therapists based on behavioral correlates. In addition, the author evaluated the effects of an operant discrimination training procedure to enhance rapport levels for therapists with low levels of rapport. More specifically, the current study evaluated: (a) if the discrimination training procedure would establish therapists’ social interactions as a discriminative stimulus and (b) if social interaction would function as a conditioned reinforcer for novel responses. Results suggest that the discrimination training procedure was successful in conditioning social interaction as a reinforcer for all child participants, and as a result, rapport increased. digital.library.unt.edu/ark:/67531/metadc699911/
A Stimulus Control Analysis of the Misinformation Effect
This paper explores research on the misinformation effect and hypothesizes a new explanation for the occurrence misinformation effect. Current psychological theories states the misinformation effect occurs when memories are skewed by the presentation of new information after an initial event. This effect has been tested in a multitude of ways, including testing words lists, pictures, colors, and change blindness. Socially, the misinformation effect has been used to explain the inaccuracies of eyewitness testimony. The current judicial system relies on the fallible memory of people and has wrongfully imprisoned numerous innocents. The purpose of this research is to show the misinformation effect is not a problem with memory storage and retrieval, but rather a product of selective stimulus control. digital.library.unt.edu/ark:/67531/metadc700022/
A Textual Analysis of News Framing in the Sri Lankan Conflict
The purpose of this study is to investigate how local and foreign newspapers used the war journalism and peace journalism frames when covering the Sri Lankan civil war, and to uncover subframes specific to the conflict. The first part of the thesis provides an in- depth literature review that addresses the history of the conflict and media freedom in Sri Lanka. The newspaper articles for the textual analysis were selected from mainstream Sri Lankan and U.S newspapers: the Daily News (a state sponsored newspaper) and Daily Mirror from Sri Lanka, and the New York Times and Washington Post from the U.S. A total of 185 articles were analyzed and categorized into war journalism and peace journalism. Next, subframes specific to the Sri Lankan conflict were identified. The overall coverage is dominated by the peace journalism frame, and the strongest war journalism frame is visible in local newspaper articles. Furthermore, two subframes specific to the Sri Lanka conflict were identified: war justification subframe and humanitarian crisis subframe. In conclusion, the study reveals that in the selected newspapers, the peace journalism frame dominated the coverage of the Sri Lankan civil war. All in all, while adding to the growing scholarship of media framing in international conflicts, the study will benefit newspaper editors and decision-makers by providing textual analysis of content produced from the coverage of war and conflict during a dangerous time period for both journalists and the victims of war. digital.library.unt.edu/ark:/67531/metadc700020/
Retail Change and Light Rail: an Exploration of Business Location Changes Accompanying Commuter Rail Development in Denton County, Texas
Within the past few decades, commuter rail routes in several major metropolitan areas have been implemented to provide an alternative to automobile transportation. Urban planners in these cities are looking to commuter rail to mitigate congestion and pollution. However, research on the impacts of commuter rail development on the surrounding retail landscape is still needed. In metropolitan Dallas-Fort Worth, the Denton County Transportation Authority recently opened its new A-Train light rail service linking suburban Denton and downtown Dallas. This thesis examines urban changes that occurred in the years before and after the A-Train line's 2011 opening, with a focus on restaurant and retail development in the vicinity of the A-Train stations in Denton County. This analysis evaluates changes in retail density and type, the population surrounding stations, and municipal initiatives that shape the retail landscape of station vicinities. This was done by gathering field data, retailer listings, population data, and conducting interviews with local businesses and city planners. The findings suggest that A-train stations have had a differential impact on the surrounding landscape, depending on the existing retail landscape, the types of retailers present, and the current state of municipal infrastructure that promotes accessibility. Overall, results suggest that urban planners play a vital role in harnessing the potential of commuter rail to promote nearby retail growth. digital.library.unt.edu/ark:/67531/metadc700058/
Evaluating the Role of Design in the Apparel Industry in the United States
The purpose of this study was to better understand the role of design in the product development process in the apparel industry in the United States, looking for variations in how design is used in the industry. In order to obtain a snapshot of the fashion design industry, creativity, originality, innovation, and product development were examined, as well as corporate culture and strategic orientation. The study also sought to examine pedagogical strategies based on these findings. A mixed methods approach, consisting of an on-line survey and interviews, was employed. The findings suggest variations in the role of design based on the time design-department employees spent on creative tasks. These variations were examined and industrial and pedagogical implications are explored. The significance of this study relates to the findings of the importance of creativity in the product development process of the apparel industry in the United States, as well as considerations for pedagogical strategies. digital.library.unt.edu/ark:/67531/metadc700003/
Evaluating the Feasibility of Accelerometers in Hand Gestures Recognition
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Gesture recognition plays an important role in human computer Interaction for intelligent computing. Major applications like Gaming, Robotics and Automated Homes uses gesture recognition techniques which diminishes the usage of mechanical devices. The main goal of my thesis is to interpret SWAT team gestures using different types of sensors. Accelerometer and flex sensors were explored extensively to build a prototype for soldiers to communicate in the absence of line of sight. Arm movements were recognized by flex sensors and motion gestures by Accelerometers. Accelerometers are used to measure acceleration in respect to movement of the sensor in 3D. Flex sensors changes its resistance based on the amount of bend in the sensor. SVM is the classification algorithm used for classification of the samples. LIBSVM (Library for Support Vector Machines) is integrated software for support vector classification, regression and distribution estimation which supports multi class classification. Sensors data is connected to the WI micro dig to digitize the signal and to transmit it wirelessly to the computing device. Feature extraction and Signal windowing were the two major factors which contribute for the accuracy of the system. Mean Average value and Standard Deviation are the two features considered for accelerometer sensor data classification and Standard deviation is used for the flex sensor analysis for optimum results. Filtering of the signal is done by identifying the different states of signals which are continuously sampled. digital.library.unt.edu/ark:/67531/metadc699862/
The Use of Optical Metrology in Active Positioning of a Lens
Precisely positioned optical lenses are currently required for many highly repetitive mechanics and applications. Thus the need for micron-scale repetition between opto-mechanical units is evident, especially in industrial manufacturing and medical breakthroughs. In this thesis, a novel optical metrology system is proposed, designed, and built whose purpose is to precisely locate the center of a mechanical fixture and then to assemble a plano-convex optical lens into the located position of the fixture. Center location specifications up to ±3 µm decenter and ±0.001° tilting accuracy are required. Nine precisely positioned lenses and fixtures were built with eight units passing the requirements with a repetitive standard deviation of ±0.15 µm or less. The assembled units show satisfactory results. digital.library.unt.edu/ark:/67531/metadc699892/
Still on the Sidelines: the Female Experience in Sports Media
This qualitative study aims to analyze the lived reality of women working in sports media today. Through systematic analysis of 12 in-depth interviews, the findings of this study suggest that the adoption of technological advancements in news media and all associated outlets have created a leveling effect for women due to the demand for highly skilled individuals who can handle the digital demand of modern news production. This study suggests that longtime gender disparities in sports media are experiencing a bit of a reprieve due to the massive digital audience and the need for professionals who can deliver information quickly and efficiently and with accuracy. However, the persistent symbolic annihilation of women as well as hegemonic hiring practices that emphasize aesthetic appeal have created a difficult path for women to move off the sidelines and into roles with more creative and analytical breadth, even with a rapidly increasing demand for jobs in the media industry. digital.library.unt.edu/ark:/67531/metadc699891/
Effects of Sertraline Exposure on Fathead Minnow (Pimephales Promelas) Steroidogenesis
Sertraline is a selective serotonin reuptake inhibitor (SSRI) that is widely used for the treatment of depression and anxiety. Due to the abundant therapeutic use of sertraline, low levels have been detected in municipal wastewater effluents suggesting that aquatic organisms may be exposed. The purpose of this study was to evaluate the steroidogenic effects of sertraline on larval (FHM) and adult female fathead minnows (FFHM), Pimephales promelas. Larval FHM were exposed to 0.1, 1, and 10 µg/L sertraline for 28 days and analyzed via RT-qPCR for differential expression of 11β-Hydroxysteroid dehydrogenase (11β-HSD), 20β-Hydroxysteroid dehydrogenase (20β-HSD), aromatase (CYP19), and nuclear thyroid receptor alpha (TRα). FFHM were exposed to 3 or 10 µg/L sertraline for 7 days with the brain and ovary excised at exposure termination. Juvenile FHM exposed to 0.1 μg/L sertraline had a significant upregulation of both 20β-HSD and TRα. FFHM exposed to 10 µg/L sertraline had a significant upregulation of 11β-HSD expression in brain tissue, while no steroidogenic changes were observed in the FFHM ovary. Similarly, in FFHM brain tissue, CYP19 and 20β-HSD expression levels were significantly higher in fish exposed to 10µg/L sertraline compared to control. The significance of these findings with respect to survival, growth and reproduction are currently unknown, but represent future research needs. digital.library.unt.edu/ark:/67531/metadc700070/
Microchannel Radiator: an Investigation of Microchannel Technology with Applications in Automotive Radiator Heat Exchangers
Microchannels have been used in electronics cooling and in air conditioning applications as condensers. Little study has been made in the application of microchannels in automotive heat exchangers, particularly the radiator. The presented research captures the need for the design improvement of radiator heat exchangers in heavy-duty vehicles in order to reduce aerodynamic drag and improve fuel economy. A method for analyzing an existing radiator is set forth including the needed parameters for effective comparisons of alternative designs. An investigation of microchannels was presented and it was determined that microchannels can improve the overall heat transfer of a radiator but this alone will not decrease the dimensions of the radiator. Investigations into improving the air-side heat transfer were considered and an improved fin design was found which allows a reduction in frontal area while maintaining heat transfer. The overall heat transfer of the design was improved from the original design by 7% well as 52% decrease in frontal area but at the cost of 300% increase in auxiliary power. The energy saved by a reduction in frontal area is not substantial enough to justify the increase of auxiliary power. The findings were verified through a computational fluid dynamic model to demonstrate the heat transfer and pressure drop of microchannel tubes. The results confirmed that heat transfer of microchannels does improve the thermal performance of the radiator but the pressure drop is such that the net benefit does not outweigh the operating cost. An additional CFD study of the new fin geometry and air-side heat transfer predictions was conducted. The results of the study confirmed the theoretical calculations for the fin geometry. digital.library.unt.edu/ark:/67531/metadc700005/
Youth-led Environmental Awareness: Initiatives Towards a Jain Faith Community Empowerment
This project employs participatory action research methods in efforts to create a community specific environmental curriculum for the high school age youth at the only Jain faith community in the North Texas region. Aligned with the community’s goals, the youth led in deciding, creating, and carrying out initiatives that were aimed at increasing the level of awareness about environmental issues amongst community members. The research done by the youth aimed at looking at environmental issues through the lens of Jain doctrine. The final creation of a curriculum as a living document to be used by the youth in efforts to promote critical thinking skills and class discussion continues the participatory model. The curriculum encourages experiential and interpretative learning, which grants ownership of the topics to the youth themselves and ultimately empowering them to learn more and spread the importance of being environmentally friendly. digital.library.unt.edu/ark:/67531/metadc700090/
A Century of Overproduction in American Agriculture
American agriculture in the twentieth century underwent immense transformations. The triumphs in agriculture are emblematic of post-war American progress and expansion but do not accurately depict the evolution of American agriculture throughout an entire century of agricultural depression and economic failure. Some characteristics of this evolution are unprecedented efficiency in terms of output per capita, rapid industrialization and mechanization, the gradual slip of agriculture's portion of GNP, and an exodus of millions of farmers from agriculture leading to fewer and larger farms. The purpose of this thesis is to provide an environmental history and political ecology of overproduction, which has lead to constant surpluses, federal price and subsidy intervention, and environmental concerns about sustainability and food safety. This project explores the political economy of output maximization during these years, roughly from WWI through the present, studying various environmental, economic, and social effects of overproduction and output maximization. The complex eco system of modern agriculture is heavily impacted by the political and economic systems in which it is intrinsically embedded, obfuscating hopes of food and agricultural reforms on many different levels. Overproduction and surplus are central to modern agriculture and to the food that has fueled American bodies for decades. Studying overproduction, or operating at rapidly expanding levels of output maximization, will provide a unique lens through which to look at the profound impact that the previous century of technological advance and farm legislation has had on agriculture in America. digital.library.unt.edu/ark:/67531/metadc700066/
Acute Effects of the Antibiotic Streptomycin on Neural Network Activity and Pharmacological Responses
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The purpose of this study is to find out that if antibiotic streptomycin decreases neuronal network activity or affects the pharmacological responses. The experiments in this study were conducted via MEA (multi-electrode array) technology which records neuronal activity from devices that have multiple small electrodes, serve as neural interfaces connecting neurons to electronic circuitry. The result of this study shows that streptomycin lowered the spike production of neuronal network, and also, sensitization was seen when neuronal network pre-exposed to streptomycin. digital.library.unt.edu/ark:/67531/metadc700026/
What Is Needed to Enable a Cultural Shift in the Market Research Department at the Gangler Company?
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This thesis investigates how to create an environment for organizational change within the Market Research Department at the Gangler Company (a US-based consumer products company). I explore what is influencing the current cultural environment and which of those influencers can be shifted to encourage organizational change toward the “ideal” culture that the organization has identified. Using new institutionalism as the theoretical approach, I discuss the significance of institutional forces (such as the economy and the rise in technology) on the cultural elements (i.e. behaviors, ideas, material artifacts and social structures) in the Market Research Department. Lastly, I show that by understanding those institutional influences, I can better assess what cultural elements can be shifted and which cannot. Of the cultural elements that are able to be shifted, I recommend three interventions that the organization should employ: 1) from a contrive culture to a culture of candor, 2) from a culture of division to a culture of cohesion, and 3) from a culture of knowing to a culture of learning. digital.library.unt.edu/ark:/67531/metadc700092/
Development and Evaluation of a Large-scale Pyramidal Staff Training Program for Behavior Management
Training and empirically evaluating caregivers’ implementation of behavior management skills is a particularly challenging task in large residential contexts. A pyramidal training approach provides an efficient and effective way to conduct large-scale competency-based behavior skills training. The purpose of this project was to develop and evaluate a large-scale pyramidal staff training program for behavior management skills. One hundred nine caregivers and 11 behavior service professionals at a large, residential care facility participated in this project. Interobserver agreement was utilized to develop and refine measurements systems to detect caregiver acquisition of skills, behavior service professionals’ ability to score caregiver performance and behavior service professionals’ ability to deliver a specified portion of the curriculum. Pre- and post-test probes were conducted utilizing standard role play scenarios and checklists to evaluate caregiver acquisition of three specific behavior management skills. The results supported the following conclusions: first, interobserver agreement measures were useful to develop a reliable measurement system, to refine some curriculum elements, and to evaluate measurement conducted by behavior service professionals. Second, behavior skills training (BST) resulted in caregiver acquisition of all three behavior management techniques. Third, the pyramidal training approach was effective to teach behavior service professionals to deliver BST and accurately measure the performances of trainees. digital.library.unt.edu/ark:/67531/metadc700014/
Synthesis of Tethering Group on Borylazadipyrromethene Dyes to Apply to Photogalvanic Dye-sensitized Solar Cells
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This is my thesis research on the preparation of borylazadipyrromethene (azaBODIPY) dyes bearing an anchoring group, such as a carboxylic acid group, at the β-pyrrolic position of the azadipyrromethene scaffold. Carboxylate groups form covalent bonds to oxide semiconductors such as TiO2 (n-type) or Cu2O (p-type) in dye-sensitized solar cells (DSCs) or photogalvanic dye-sensitized solar cells (P-DSCs). Oxide-binding azaBODIPY dyes can be used to investigate the rate and mechanism of electron injection from the dyes to the semiconductors. Two different types of azaBODIPY (difluoroboryl and dialkynylboryl) were prepared by following previously developed methods. To convert difluoroborylazaBODIPY to the final dyes having a carboxylic acid in the β-pyrrolic position, several distinct synthetic routes were designed, adopting various reactions, such as halogenation, Sonogashira coupling, Knoevenagel condensation, Grignard reagents, Vilsmeir-Haack, and Steglich esterification. Some of these reactions were successful, but the overall synthesis to the targeted final molecule couldn’t be accomplished. Even though further studies on the synthesis of oxide-binding azaBODIPYs are needed, at least my thesis research suggests what reactions can be implemented to complete this synthesis in the future. Proton NMR (nuclear magnetic resonance) and carbon NMR were commonly used to confirm the synthesized compounds, and sometimes crystallographic information was obtained by XRD (X-ray diffraction) whenever crystals of sufficient size and quality were grown. NMR spectra, interpreted by SpinWorks 3 software, and crystal structures will be introduced in each chapter. digital.library.unt.edu/ark:/67531/metadc700072/
Analytical Model for Lateral Deflection in Cold-formed Steel Framed Shear Walls with Steel Sheathing
An analytical model for lateral deflection in cold-formed steel shear walls sheathed with steel is developed in this research. The model is based on the four factors: fastener displacement, steel sheet deformation, and hold-down deformation, which are from the effective strip concept and a complexity factor, which accounts for the additional influential factors not considered in the previous three terms. The model uses design equations based on the actual material and mechanical properties of the shear wall. Furthermore, the model accounts for aggressive and conservative designers by predicting deflection at different shear strength degrees. digital.library.unt.edu/ark:/67531/metadc700013/
Toward Sustainable Community: Assessing Progress at Dancing Rabbit Ecovillage
Dancing Rabbit Ecovillage, an intentional community of roughly 70 members in Northeastern Missouri, is working to create societal change through radical sustainable living practices and creation of a culture of eco-friendly and feminist norms. Members agree to abide by a set of ecological covenants and sustainability guidelines, committing to practices such as using only sustainably generated electricity, and no use or storage of personally owned vehicles on community property. Situated within the context of a sustainability study, this thesis explores how Dancing Rabbit is creating a more socially and ecologically just culture and how this lifestyle affects happiness and well-being. digital.library.unt.edu/ark:/67531/metadc700019/
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