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 Degree Level: Master's
Design of Multi Band Microwave Devices Using Coupled Line Transmission Lines
Multi band technology helps in getting multiple operating frequencies using a single microwave device. This thesis presents the design of dual and tri band microwave devices using coupled transmission line structures. Chapter 2 presents the design of a novel dual band transmission line structure using coupled lines. In chapter 3, Design of a dual band branch line coupler and a dual band Wilkinson power divider are proposed using the novel dual band transmission line structure presented in the previous chapter. In chapter 4, Design of a tri band transmission line structure by extending the dual band structure is presented. The Conclusion and future work are presented in chapter 5. digital.library.unt.edu/ark:/67531/metadc801903/
A Multimodal Investigation of Renewal of Human Avoidance, Perceived Threat, and Emotion
Many people who receive exposure-based treatments for anxiety disorders exhibit a return of fear and avoidance which is often referred to as renewal or relapse. Human and nonhuman research on fear conditioning and renewal has been instrumental in helping understand relapse in anxiety disorders. The purpose of this investigation was to examine renewal of human avoidance and assess whether avoidance may aid in sustaining renewal of fear responses. We adopted a multimodal measurement approach consisting of an approach-avoidance task along with ratings of perceived threat and fear and measures of skin-conductance, a widely used physiological measure of fear. A traditional, single-subject research design was used with six healthy adults. All tasks employed a discrete trial procedure. Experimental conditions included Pavlovian fear conditioning in which increased probability of money loss was paired with a “threat” meter in Context A and later followed extinction in Context B. Fear and avoidance increased to higher threat levels in Context A but not Context B. Renewal testing involved presenting the threat meter on a return to Context A to determine if it evoked fear and avoidance (i.e., relapse). As predicted, renewal testing in Context A showed that increased threat was associated with increased avoidance, ratings of perceived threat and fear, and higher skin-conductance. Moreover, results showed that renewal maintained over six blocks of trials. This is the first investigation of renewal of threat and avoidance in humans that highlights avoidance as a mechanism that may contribute to maintaining fear in anxiety pathology. digital.library.unt.edu/ark:/67531/metadc801907/
Act Like a Punk, Sing Like a Feminist: a Longitudinal Content Analysis of Feminist Themes in Punk Rock Song Lyrics, 1970-2009
Punk rock music has long been labeled sexist as copious media-generated accounts and reports of the genre concentrate on male artists, hyper-masculine performances, and lyrics considered to be aggressive, sexist, and misogynist. However, scholars have rarely examined punk rock music longitudinally, focusing heavily on 1980s and 1990s manifestations of the genre. Furthermore, few systematic content analyses of feminist themes in punk rock song lyrics have been conducted. The present research is a longitudinal content analysis of lyrics of 600 punk rock songs released for four decades between 1970 and 2009 to examine the prevalence of and longitudinal shifts in antiestablishment themes, the prevalence of and longitudinal shifts in sexist themes relative to feminist themes, the prevalence of and longitudinal shifts in specific feminist branches, and what factors are related to feminism. Using top-rated albums retrieved from Sputnik Music’s “Best Punk Albums” charts, systematic random sampling was applied to select 50 songs for each combination of three gender types and four decades. Sexism and feminism were then operationalized to construct a coding sheet to examine relevant dimensions. While the present study found no significant patterns of longitudinal increase or decrease in feminist or sexist themes, it revealed that feminist themes were consistently high across four decades and, furthermore, indicated a phenomenon of post-modern hybridity. digital.library.unt.edu/ark:/67531/metadc801944/
The Best Medicine
The Best Medicine is an animated documentary that explores the true stories behind the live performances of stand-up comedians. The film juxtaposes live stand-up performances with candid interview footage combined with animation and illustration. Three subjects– Michael Burd, Casey Stoddard, and Jacob Kubon– discuss alcoholism, childhood abuse, and sexual anxiety, respectively. Their candid, intimate interviews reveal personal information, creating a new context with which to understand live stand-up comedy performance. This illustrates themes of finding humor in dark or painful circumstances and the cathartic nature writing and performance. digital.library.unt.edu/ark:/67531/metadc801938/
Spanish Measurement of Adult Attachment: Reliability and Validity of the Experiences in Close Relationships Scale in a Hispanic American Sample
Measures of adult attachment developed in English have been translated and validated in multiple Spanish-speaking countries, yet to this date no self-report adult attachment instrument has been systematically examined for validation with Latinos/Hispanic Americans. The present study examined psychometric properties of a Spanish version of a widely used adult attachment scale, the Experiences in Close Relationships Scale (ECRS), with a bilingual college student sample. Following the dual-language split half (DLSH) quantitative method of evaluating semantic equivalence, 209 bilingual, Latinos/Hispanic American college students recruited from a large public university completed a DLSH version of the ECRS (half English, half Spanish). Internal consistency reliability and DLSH reliability were within acceptable limits, although significantly smaller than coefficients of the English ECRS completed by a large Caucasian sample (n = 459); 3- to 8-week test-retest reliability was also adequate. Exploratory factor analysis revealed a two-factor solution with 35 items accounting for 40% of the variance, which was similar to the English ECRS. Convergent validity was supported by findings that showed significant associations of attachment dimensions with social self-efficacy, self-esteem, depressive symptoms, and comfort with self-disclosure, but not interpersonal trust. Evidence for discriminant validity was found in that attachment dimensions were not significantly associated with social desirability. Theoretical implications, limitations, and future directions of the study will be discussed based on adult attachment theory and cross-cultural perspectives. digital.library.unt.edu/ark:/67531/metadc801946/
Let the Punishment Fit the Crime: an Overview of the Historical Approach to Probation in the State of Texas
Adult probation evolved in the United States as a result of the suspended sentence concept. As a result of a lack of follow through when an individual obtained a suspended sentence, there was no “checks and balances” to monitor whether an individual completed the guidelines set forth. As time progressed, it became apparent a more cohesive and monitored system was needed. Thus, an energetic and motivated individual, John Augustus, started the concept of probation by taking it upon himself to assist in the rehabilitative process of individuals charged with criminal behavior. Subsequent to his death, the concept of probation was embraced by his advocates who lobbied legislatively in order to enact probation laws that would oversee the success of probationers. It wasn’t until the 1950’s that the counties in the state of Texas took it upon themselves to enact their own system of monitoring of probationers. Over time the states have guided their probation concepts from evidence based research. Juvenile probation in the United States didn’t gain a solid foundation until the end of the 19th century with the development of the first juvenile court in Illinois. It took this country time to understand that juveniles were different than adults mentally; therefore, there would need to be a separation of juveniles from adults from being subjected to the same punishments as adults. The approach in dealing with juveniles was more grounded in treatment rather than in punishment. In the state of Texas, the focus for juvenile probation was based on different approaches based on the areas within the state. The juvenile system has gone through the due process era to its current state of the evidence based research. This thesis will provide the reader an overview of the history of the development of probation in the United States and in the State of Texas, specifically in the two largest counties in Texas. This thesis will go into detail in how probation came into existence to where it is in its current state. digital.library.unt.edu/ark:/67531/metadc801934/
Effect of Friction-stir Processing on the Wear Behavior of Titanium (Ti-1al-8v-5fe) and Stainless Steel (A-286) Alloys
The effect of friction stir processing (FSP) on the mechanical wear behavior was investigated for Ti-1Al-8V-5Fe (Ti-185) and stainless steel (Incoloy® A-286) alloys. The Ti-185 and A-286 alloys were tested in different processing conditions, including as rolled (AR), AR+FSP, and AR+FSP+aged. A high frequency reciprocating rig was used to simulate fretting-type wear of these alloys at room temperature. The Vickers micro-hardness and wear rates were calculated and compared for each processing condition. It was determined that along with increasing hardness in the stir zones, FSP resulted in improved wear resistance for both alloys. Specifically, wear rates in the stir zones were reduced to lowest values of 1.6 x 10-5 and 5.8 x 10-7 mm3/N·m for the AR+FSP+aged Ti-185 and A-286 alloys, respectively, despite lower hardness for A-286 alloy. Mechanistic studies were conducted to determine the reason behind these improvements in wear resistance and the effect of FSP on the microstructural evolution during wear. For the Ti-185 alloy, x-ray diffraction revealed that there was a phase transformation from β-Ti (AR+FSP) to α-Ti (AR+FSP+aged). This phase decomposition resulted in the harder and stiffer Ti phase responsible for lowering of wear rate in Ti-185. While x-ray diffraction confirmed the A-286 alloy retains its austenitic structure for all conditions, scanning electron microscopy revealed completely different wear track morphology structures. There was increased coarse abrasion (galling) with the AR+aged A-286 alloy compared to the much finer-scale abrasion with the AR+FSP+aged alloy, which was responsible for smaller and less abrasive wear debris, and hence lower wear rate. Furthermore, cross-sectional focused ion beam microscopy studies inside the stir zone of AR+FSP+aged A-286 alloy determined that a) increased micro-hardness was due to FSP-induced microscopic grain refinement, and b) the corresponding wear rate decrease was due to even finer wear-induced grain refinement. With both effects combined, the level of damage and surface fatigue wear was suppressed resulting in lowering of the wear rate. In contrast, the absence of FSP-induced grain refinement in the AR+aged A-286 alloy resulted in lower hardness and increasing wear rate. In addition, micro-Raman spectroscopy inside the stir wear zone determined that the wear debris contained metal oxides of Fe3O4, Cr2O3, and NiO, but were a consequence and not the cause of low wear. Overall, FSP of titanium and stainless steel alloys resulted in lowering of wear rates suggesting it is a viable surface engineering technique to target and mitigate site-specific wear. digital.library.unt.edu/ark:/67531/metadc801955/
Classifying Pairwise Object Interactions: A Trajectory Analytics Approach
We have a huge amount of video data from extensively available surveillance cameras and increasingly growing technology to record the motion of a moving object in the form of trajectory data. With proliferation of location-enabled devices and ongoing growth in smartphone penetration as well as advancements in exploiting image processing techniques, tracking moving objects is more flawlessly achievable. In this work, we explore some domain-independent qualitative and quantitative features in raw trajectory (spatio-temporal) data in videos captured by a fixed single wide-angle view camera sensor in outdoor areas. We study the efficacy of those features in classifying four basic high level actions by employing two supervised learning algorithms and show how each of the features affect the learning algorithms’ overall accuracy as a single factor or confounded with others. digital.library.unt.edu/ark:/67531/metadc801901/
Application of Cyclic Polarization of Aluminum 3003 Used in All-aluminum Microchannel Heat Exchangers
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All-aluminum microchannel heat exchangers are designed to significantly reduce refrigerant charge requirements, weight, reduced brazed joints, and decreased potential for leakage by increasing reliability. Al 3003 alloy is corrosion resistant and can be formed, welded, and brazed but the issue with all-aluminum heat exchangers is localized corrosion (pitting) in corrosive environments. Currently, there is no universally accepted corrosion test that all coil manufacturers use to characterize their products. Electrochemical testing method of cyclic polarization was employed in this investigation and relevant parameters including electrolyte corrosive agent and its concentration, electrolyte pH, and applied potential scan rate was varied to find an optimal set of parameters. Results of cyclic polarization of Al 3003 in electrolytes containing various concentrations of NaCl were compared with those of the tests in Sea Water Acidified Accelerated Test (SWAAT) electrolyte and it is shown the SWAAT electrolyte (4.2% sea salt acidified to pH of 2.9) is by far stronger (in terms of corrosivity) than typical 3.5% NaCl solution used in most corrosion testing. Corrosion rates (g/m2yr) of Al 3003 measured in this investigation were comparable to those provided by ISO 9223 standard corresponding to C1 through CX categories. Duration of cyclic polarization test is much shorter than that of SWAAT and results obtained in this test is more reproducible compared to those of SWAAT. Scanning electron microscopy micrographs show typical pit depths of about 50 μm. digital.library.unt.edu/ark:/67531/metadc801930/
Transition Metal Catalyzed Oxidative Cleavage of C-o Bond
The focus of this thesis is on C-O bonds activation by transition metal atoms. Lignin is a potential alternative energy resource, but currently is an underused biomass species because of its highly branched structure. To aid in better understanding this species, the oxidative cleavage of the Cβ-O bond in an archetypal arylglycerol β-aryl ether (β–O–4 Linkage) model compound of lignin with late 3d, 4d, and 5d metals was investigated. Methoxyethane was utilized as a model molecule to study the activation of the C-O bond. Binding enthalpies (ΔHb), enthalpy formations (ΔH) and activation enthalpies (ΔH‡) have been studied at 298K to learn the energetic properties in the C-O bond cleavage in methoxyethane. Density functional theory (DFT) has become a common choice for the transition metal containing systems. It is important to select suitable functionals for the target reactions, especially for systems with degeneracies that lead to static correlation effects. A set of 26 density functionals including eight GGA, six meta-GGA, six hybrid-GGA, and six hybrid-meta-GGA were applied in order to investigate the performance of different types of density functionals for transition metal catalyzed C-O bond cleavage. A CR-CCSD(T)/aug-cc-pVTZ was used to calibrate the performance of different density functionals. digital.library.unt.edu/ark:/67531/metadc801914/
An Evaluation of Matrix Training Approaches for Teaching Compound Labels to Toddlers
Matrix training techniques arrange instruction for stimulus relations that facilitate emergent responding to novel stimulus arrangements, which is a phenomenon known as recombinative generalization. The current study compared two common matrix training approaches, an overlapping (OV) design and a non-overlapping (NOV) design, with respect to arranging relations targeted for training. Two, typically-developing toddlers were taught compound action-object labels in either an OV or NOV matrix training design. Results suggest that an OV matrix design facilitates recombinative generalization more effectively than a NOV design. digital.library.unt.edu/ark:/67531/metadc801954/
Distributed Frameworks Towards Building an Open Data Architecture
Data is everywhere. The current Technological advancements in Digital, Social media and the ease at which the availability of different application services to interact with variety of systems are causing to generate tremendous volumes of data. Due to such varied services, Data format is now not restricted to only structure type like text but can generate unstructured content like social media data, videos and images etc. The generated Data is of no use unless been stored and analyzed to derive some Value. Traditional Database systems comes with limitations on the type of data format schema, access rates and storage sizes etc. Hadoop is an Apache open source distributed framework that support storing huge datasets of different formatted data reliably on its file system named Hadoop File System (HDFS) and to process the data stored on HDFS using MapReduce programming model. This thesis study is about building a Data Architecture using Hadoop and its related open source distributed frameworks to support a Data flow pipeline on a low commodity hardware. The Data flow components are, sourcing data, storage management on HDFS and data access layer. This study also discuss about a use case to utilize the architecture components. Sqoop, a framework to ingest the structured data from database onto Hadoop and Flume is used to ingest the semi-structured Twitter streaming json data on to HDFS for analysis. The data sourced using Sqoop and Flume have been analyzed using Hive for SQL like analytics and at a higher level of data access layer, Hadoop has been compared with an in memory computing system using Spark. Significant differences in query execution performances have been analyzed when working with Hadoop and Spark frameworks. This integration helps for ingesting huge Volumes of streaming json Variety data to derive better Value based analytics using Hive and Spark. digital.library.unt.edu/ark:/67531/metadc801911/
The Burner Project: Privacy and Social Control in a Networked World
As mobile phones become increasingly ubiquitous in today’s world, academic and public audiences alike are curious about the interaction between mobile technologies and social norms. To investigate this phenomenon, I examined how individuals use technology to actively manage their communication behaviors. Through a three-month research project on usage patterns of Burner, a mobile application, this thesis explores the relationships among technology, culture, and privacy. Burner is a service that equips individuals with the means to create, maintain, and/or dissolve social ties by providing temporary, disposable numbers to customers. The application offers a way to communicate without relying on a user’s personal phone number. In other words, Burner acts as a “privacy layer” for mobile phones. It also provides a valuable platform to examine how customers use the application as a strategy for communication management. This thesis represents a marriage of practice and theory: (1) As an applied enterprise, the project was constructed as a customer needs assessment intending to examine how the service was situated in the lives of its users. The findings have successfully been applied to my client’s company strategy and have led to a more informed customer approach. (2) As an academic endeavor, this research contributes to existing scholarship in anthropology, computer-mediated communication, privacy, and design. The results provide rich fodder for discussions about the impact of mobile communication and services. digital.library.unt.edu/ark:/67531/metadc801891/
Restoration Techniques for Northern Bobwhites
Isolated populations of northern bobwhites (Colinus virginianus) have declined causing many quail managers to attempt population restoration by releasing captive-reared bobwhites or translocating wild bobwhites. I evaluated three restoration techniques: (1) release of captive-reared bobwhites, (2) translocation of bobwhites from high densities to low densities, and (3) release of captive-reared and translocated bobwhites acclimated on site prior to release. These results show that captive-reared birds have reduced survival and fewer nesting attempts when compared to translocated birds and that acclimation time was not a factor. I hypothesized that high mortality rates were caused by captive-reared birds exhibiting different predator avoidance behavior than wild birds. Captive-reared and wild-trapped bobwhites were subjected to independent predator simulations and their responses were recorded on high definition video. Threat recognition time, reaction type, and reaction time was recorded for comparative analysis. Pen-reared birds recognized the simulated raptorial and terrestrial predator threats quicker than wild-trapped birds, but reaction times were not different among groups. However, the type of reaction was different among groups where pen-reared birds typically flushed immediately upon recognizing either simulated predator as compared to wild-trapped birds which typically ran or held when subjected to the raptorial threat and showed little to no observable reaction to the terrestrial threat. These results reveal a potential loss of a holding trait in pen-reared birds, resulting in a quicker revealing of their position in the presence of a threat, thereby increasing their risk of predation. digital.library.unt.edu/ark:/67531/metadc801897/
Adult Attachment, Acculturation and Help-seeking of Latino College Students
Based on theoretical reasoning and empirical evidence, the present study examined the unique and shared effects of attachment anxiety, attachment avoidance, and acculturation on attitudes toward seeking professional help among Latino college students. The research participants included 149 bilingual Latino college students from a large, public southwestern university. Results of a multiple regression analysis indicated that attachment avoidance was positively associated with both the recognition of need for psychological help and stigma of seeking professional help. Acculturation to American society was found to be statistically insignificant in predicting help-seeking attitudes in this sample of the population. Findings from exploratory questions suggested that Latino individuals would most likely seek help from parents, close friends, and then professionals. This study suggested that Latino individuals with high attachment avoidance acknowledge the potential benefit of professional help-seeking but distrust the process of approaching others for help. Limitations, implications, and future research directions will be discussed. digital.library.unt.edu/ark:/67531/metadc801882/
Forward Genetic Characterization of Medicago Truncatula Tnt1 Insertion Mutants Defective in Nodule Development and Symbiotic Nitrogen Fixation
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Legumes are unique plants because they form special structures “nodules”, via symbiotic relationships with rhizobial bacteria present in the soil. Once rhizobia mature inside nodules, they fix atmospheric nitrogen providing a source of bioavailable nitrogen to the plant. To discover novel genetic components involved in the legume-rhizobia symbiosis by using forward genetic screening, we have isolated Medicago truncatula Tnt1 insertion mutants in the R108 ecotype, which are defective in nodule development and symbiotic nitrogen fixation in response to Sinorhizobium meliloti. Out of three mutants NF11044, NF11217 and NF8324, one of the mutants showed brown nodules and Fix- phenotype that is defective in symbiotic nitrogen fixation. The other two mutants showed white nodules and Fix- phenotype, also indicator of defects in symbiotic nitrogen fixation. To identify the underlying mutation causing the phenotype, we have developed molecular genetic markers by obtaining genomic sequences flanking the Tnt1 insertions by TAIL-PCR and Illumina sequencing. To carry out co-segregation analysis, back-crossed BC1F2 segregating populations were obtained. These are being phenotyped, genotyped and analyzed for co-segregation of the phenotype with the Tnt1 genetic markers. Back-crossing also has the effect of reducing the Tnt1 insertions, which are not linked to the nodulation defective phenotypes. Out of the three mutants, NF8324 harbors exactly the same insertion as in the rsd-1 Tnt1 mutant NF11265. The defect in NF11217 is caused by a Tnt1 insertion in the previously described PLC gene; the site of this insertion is close to that found in a different mutant, NF0217. For mutant NF11044, we developed linkage markers that place the defective locus on chromosome 7. To further characterize co-segregation in NF11044, a mapping population has been created by crossing the mutant with other ecotypes: A17 and A20. We tested mutants and wild type plants with linkage marker A20 X NF11044 BC1F2 that segregates 3:1(wild type: mutant). The recombination frequency ratio is similar as compared to back-crosses to ecotype R108. However, we did not observe mutant phenotypes in the A17 X NF11044 BC1F2 population. Future identification of the defective gene and functional characterization of it once it is identified will be carried out to better understand the mechanism of nodule organogenesis and symbiotic nitrogen fixation. digital.library.unt.edu/ark:/67531/metadc801877/
An Evaluation of Reinforcement Effects of Preferred Items During Discrete-trial Instruction
This study compared the relative reinforcing efficacy of high-preferred and low-preferred stimuli, as determined by two types of preference assessments, on acquisition rates in three children diagnosed with an Autism Spectrum Disorder (ASD). The study also evaluated the indirect effects of preference on students’ stereotypy and problem behavior during instructional periods. Participants were presented with a task and provided high or low-preferred stimuli contingent upon correct responding. Results showed that acquisition occurred more rapidly in the highly preferred condition for some participants. Higher rates of problem behavior occurred in the low preferred condition for all participants. These results highlight the importance of utilizing preference assessment procedures to identify and deliver high-preferred items in skill acquisition procedures for individuals with ASD. digital.library.unt.edu/ark:/67531/metadc801884/
A Training Package for Parents and their Toddlers with Autism: Observed Changes in Parent Teaching Episodes, Child Turn Taking and Social Attending, and Parent-Child Engagement
Research has shown that parents of children with autism report higher stress than parents of children with other developmental disabilities. It has been suggested that parent training programs, specifically naturalistic social-communication training, can reduce parental stress and enhance the quality of the parent-child relationship. Although the development of a multilevel assessment has been suggested, much of the research in this area has relied on measures of parent implementation fidelity and specific child target skills such as vocal communication, eye contact, and joint attention. Few have directly measured the parent-child interaction. The purpose of the current study is to examine the effects of an in-home parent training package for toddlers with autism on parent-child social interactions. Within this package, parents are taught to attend to contextual variables, to arrange the environment to set the occasion for child responding, to respond immediately to targeted child approximations, and to respond in ways that are mutually reinforcing, social, and fun. Data were collected during 5-min video-taped assessments, on the number of parent teaching episodes, child target skills (turn taking and social attending), engagement, and synchronous engagement. Results were evaluated in a multiple baseline design across two parent-child dyads and indicated increases in all measures. This study contributes to the current discussion on toddler parent-training programs and extends it in a way that highlights the benefits of using a multi-level assessment to measure the parent-child interaction. digital.library.unt.edu/ark:/67531/metadc801880/
Gracias a La Nacionalización De Los Hidrocarburos: a Critical Analysis of Bolivia’s Transition to Compressed Natural Gas
This paper critically analyzes the implementation of compressed natural gas and the ways in which it creates discourse in urban Bolivia. The rapidly developing nation is keen on making ubiquitous use of compressed natural gas a reality by issuing subsidies, citing increased mobility, savings, and environmental stewardship as the primary motives. Currently, eight out of every 10 public vehicles in Bolivia are powered by compressed natural gas. Through semi-structured interviews, questionnaires and secondary data collection, this paper elucidates the transitional process of building a natural gas-based transport network through discursive governance. This work draws on the critical discourse analysis literature to dissect disaggregated modal preference data, government documents, and news articles collected in Santa Cruz, Latin America's second fastest growing city. Moreover, this paper identifies and examines the ways in which the counter-discourse impacts the transformation of the country’s energy matrix. Results show that Bolivian automobile owners are reluctant to convert their automobiles, despite reduced transportation costs, stating that minimal compressed natural gas infrastructure exists outside of urban areas, and the conversion damages their vehicles’ motor. Additionally, the research reveals that automobile owners are currently the main beneficiaries, though respondents who do not posses an automobile speak more favorably of natural gas. Finally, this research illustrates that the compressed natural gas-oriented policies encourage personal automobile use that continues to drive socio-spatial segregation of Santa Cruz’s residents. Thus, the compressed natural gas discourse helps shape the urban landscape by persuading the public to consume domestically extracted and manufactured natural gas. digital.library.unt.edu/ark:/67531/metadc801935/
The Intervention of Human Modifications on Plant and Tree Species in the Landscape of the Lbj National Grasslands
An analysis utilizing both ArcGIS and ethnographic interviews from private land owners and environmental professionals examined how man-made landscape changes affected plant and tree species in the LBJ National Grasslands in Wise County, Texas north of Decatur. From the late 1800s to the Dust Bowl Era the land was used for crop production and cattle grazing resulting in erosion and loss of soil nutrients. The research indicated by 2001 that cattle grazing and population increase resulted in land disturbance within the administrative boundary of the national grasslands. Participants expressed concern over the population increase and expansion of 5 to 10 acre ranchettes for cattle grazing common in modern times. Recommendations for the future included utilizing and expanding the resources already existing with environmental professionals to continue controlling erosion. digital.library.unt.edu/ark:/67531/metadc801905/
Ideal Learning Spaces: the Student Perspective
Classrooms, libraries, student unions, and university campuses shape students’ learning experiences. These physical learning spaces set the stage for college student engagement and academic performance. Most of the research about the role of physical spaces in learning lacks the student perspective. The goal of this study was to offer a student-centered vision of ideal learning spaces. Students are the learners for whom learning spaces are designed, and this thesis examines the way students of one summer class at Oklahoma Baptist University conceptualized and interacted with their learning spaces. Data collection included surveys of the students, a focus group with members of the class, participant observation in the classroom, and interviews with students and the professor. Students viewed physical spaces as the backdrop for human action and chose spaces that supported their learning styles and goals. Students described supportive spaces as warm, purposefully crafted spaces, and full of other people who were seriously pursuing the same goals. This thesis explores the ways students conceptualized and interacted with learning spaces as a network of support for their learning and provides recommendations for the design of learning spaces that facilitate this support. digital.library.unt.edu/ark:/67531/metadc801917/
Marital Status and Racial/ethnic Differences in Health Outcomes
Substantial evidence demonstrates that marriage is associated with better health outcomes and lower mortality risk. Some evidence suggests that there are gender and race/ethnicity differences between the marriage-health benefits association. However, previous studies on marriage and health have mainly focused on non-Hispanic White-Black differences. Limited information is available regarding the roles of Hispanics. The present study examined marital status, gender, and the differences between non-Hispanic Whites, non-Hispanic Blacks, and Hispanics, in health outcomes. A retrospective cohort analysis of 24,119 Hispanic, NH White, and NH Black adults admitted to a large hospital was conducted. A total of 16,661 patients identified as either married or single was included in the final analyses. Consistent with the broader literature, marriage was associated with beneficial hospital utilization outcomes. With respect to differences in these benefits, results suggest that married patients, Hispanic patients, and women, were less likely to experience in-hospital mortality. Similar effects were observed in aggregated length of stay with married Hispanic women hospitalized nearly 2 days less than their single counterparts (6.83 days and 8.66 days, respectively). These findings support existing literature that marriage is associated with health benefits, add to the emerging research of a Hispanic survival advantage, and broaden the understanding of marriage and health in terms of differences by racial/ethnicity. digital.library.unt.edu/ark:/67531/metadc801949/
Prevalence and Predictors of Perinatal Mental Health Outcomes
Prior research has identified risk factors that may contribute to the development of maternal stress reactions following childbirth. Specifically, situational factors (e.g., factors associated with childbirth), individual factors, and personality factors, have been explored in a multitude of prior studies. The current study sought to build upon this literature by examining both risk and resilience in a sample of both mothers and fathers via a prospective longitudinal investigation. Baseline assessment of expectant parents occurred prior to the birth of their child, with additional assessment at approximately 1, 6, and 9 weeks post-childbirth. A total of 50 participants completed all four of these assessments. Results indicated approximately 20% (n = 10) of participants endorsed moderate or greater stress symptoms after birth, while 22% (n = 11) also exhibited symptoms of moderate or greater depressive symptoms. Stress reactions were assessed with the Perinatal Posttraumatic Stress Disorder Questionnaire (PPQ); validity analyses indicated the PPQ had significantly stronger correlations with convergent measures than discriminant measures. Additionally, participants were randomized into one of two post-delivery study arms: an expressive writing group or an active control group. Although expressive writing results were inconclusive, there was a general effect of time, which may be reflective of a natural recovery process. Given the prevalence of stress and depressive reactions in this sample, and the population, exploration into feasible and accessible treatment interventions is warranted. While these results also suggest a potential natural recovery for some participants, interventions for support in the short-term timeframe after childbirth may continue to be useful. digital.library.unt.edu/ark:/67531/metadc801915/
Pastoral Livelihoods and Household Water Management in the Central Argentine Andes
Pastoralists tend to occupy highlands and drylands lands with uncertain climates and are experienced at coping with climatic variability and drought. Increasingly, however, the speed with which climate patterns are changing has become an issue of concern. This study examines household water management strategies of pastoralists in western Argentina. In this semi-arid region, pastoralists rely primarily on streams and springs fed by snow and glacier melt from the Andes, and have developed various strategies to meet their water needs. They also deal with myriad challenges posed by climate, economic, and socio-cultural change and work vigorously to maintain their herds – a combination of cattle, goats, and sheep – in this water scarce region. The goal of this study is to understand: 1) different household water management strategies; 2) the ways pastoral livelihoods are changing in response to changes in water supply; and 3) the socio-economic changes that affect pastoral livelihoods. Information from interviews, household surveys, and participant observations reveals that climate fluctuation impacts water supplies and use, herd size, and expenses made on tanks, technology, and infrastructure for the storage and transport of water, food for animals, and subsistence crops. Understanding the micro-scale, water practices of pastoral households provides insight into the ways rural populations in semi-arid and arid environments respond to changes in climate and meet their water needs. Moreover, these findings can contribute to scholarship on traditional and local knowledge and resource management systems, and may potentially inspire the development of adaptive management solutions. digital.library.unt.edu/ark:/67531/metadc801921/
Dual-Band Quarter Wavelength and Half Wavelength Microstrip Transmission Line Design
The thesis represents the design for dual-band quarter wavelength and half wavelength microstrip transmission line. Chapter 2 proposed the design of a novel dual-band asymmetric pi-shaped short-circuited quarter wavelength microstrip transmission line working at frequencies 1GHz and 1.55 GHz for 50Ω transmission line and at frequencies 1GHz and 1.43GHz for 60Ω transmission line. Chapter 3 proposed the design of a novel dual-band quarter wavelength microstrip transmission line with asymmetrically allocated open stubs and short-circuited stubs working at frequencies 1GHz and 1.32GHz. Chapter 4 proposed the design of dual-band pi-shaped open stub half wavelength microstrip transmission line working at frequencies 1GHz and 2.07GHz. Numerical simulations are performed both in HyperLynx 3D EM and in circuit simulator ADS for all of the proposed designs to measure the return loss (S11) and insertion loss (S12) in dB and phase response for S12 in degree. digital.library.unt.edu/ark:/67531/metadc801931/
Zooarchaeology and Biogeography of Freshwater Mussels in the Leon River During the Late Holocene
The Leon River, a small-medium river in central Texas, is highly impacted by multiple impoundments, enrichment from agricultural runoff, and decreased dissolved oxygen levels. This degraded river contains sixteen unionid species, two of which are both endemic to the region and candidates for the federal endangered species listing (Quadrula houstonensis and Truncilla macrodon). While there is a short historical record for this river basin and a recent modern survey completed in 2011, zooarchaeological data adds evidence for conservation efforts by increasing the time depth of data available and providing another conservation baseline. Zooarchaeological data for the Leon River is available from the two Late Holocene archaeological sites: 41HM61 and the Belton Lake Assemblages. Data generated from these assemblages describe the prehistoric freshwater mussel community of the Leon River in terms of taxonomic composition and structure. By comparing this zooarchaeological data to the data generated by the longitudinal modern survey of the Leon River, long term changes within the freshwater mussel community can be detected. A conceptual model is constructed to evaluate how robusticity, identifiability, and life history ecology affect unionid taxonomic abundances in zooarchaeological data. This conceptual model functions as an interpretive tool for zooarchaeologists to evaluate forms of equifinality in zooarchaeological assemblages. This thesis determines differences between the late Holocene and modern freshwater community of the Leon River, explores how different alternative mechanisms influence zooarchaeological data, and exemplifies of how zooarchaeological data can be used for conservation biology. digital.library.unt.edu/ark:/67531/metadc801918/
Quantitative Correlation Analysis of Motor and Dysphonia Features of Parkinsons Disease
The research reported here deals with the early characterization of Parkinson’s disease (PD), the second most common degenerative disease of the human motor system after Alzheimer’s. PD results from the death of dopaminergic neurons in the substantia nigra region of the brain. Its occurrence is highly correlated with the aging population whose numbers increase with the healthcare benefits of a longer life. Observation of motor control symptoms associated with PD, such as gait and speech analysis, is most often used to evaluate, detect, and diagnose PD. Since speech and some delicate motor functions have provided early detection signs of PD, reliable analysis of these features is a promising objective diagnostic technique for early intervention with any remedial measures. We implement and study here three PD diagnostic methods and their correlation between each other’s results and with the motor functions in subjects diagnosed with and without PD. One initial test documented well in the literature deals with feature analysis of voice during phonation to determine dysphonia measures. Features of the motor function of two fingers were extracted in tests titled “Motor function of alternating finger tapping on a computer keyboard” and “Motor function of the index and thumb finger tapping with an accelerometer”, that we objectively scripted. The voice dysphonia measures were extracted using various software packages like PRAAT, Wavesurfer, and Matlab. In the initial test, several robust feature selection algorithms were used to obtain an optimally selected subset of features. We were able to program distance classifiers, support vector machine (SVM), and hierarchical clustering discrimination approaches for the dichotomous identification of non-PD control subjects and people with Parkinson’s (PWP). Validation tests were implemented to verify the accuracy of the classification processes. We determined the extent of functional agreement between voice and motor functions by correlating test results. digital.library.unt.edu/ark:/67531/metadc801902/
La Búsqueda De La Identidad Femenina En Las Novelas De Dos Autoras Mexicanas
The novel is one means by which writers can provide examples of the possibilities for women in patriarchal societies to seek greater independence. Sabina Berman (1955- ) and Silvia Molina (1946- ) are modern day Mexican novelists whose writings support the betterment of the female condition in this Latin American society. This study focuses on these two authors and describes and analyzes several of their female protagonists who can be characterized as being in search of their self-identity and self-realization. The novels of interest are La Bobe (2006) and La Mujer que Buceó Dentro del Corazón del Mundo (2010) by Sabina Berman and La Mañana Debe Seguir Gris (1977) and El Amor Que Me Juraste (1998) by Silvia Molina. The theoretical framework used to analyze these novels is based on The Second Sex by Simone de Beauvoir and on the writings of the Mexican author Rosario Castellanos. These novels provide examples of how women can challenge patriarchal social norms in order to seek their identity as an individual and their self-realization. However, to do this, women must be willing to accept the risks and costs that may accompany this self-searching. By seeking identity women can satisfy their longings and desires, but at the same time this may also produce undesired results. Nevertheless, these novels show that women have the ability to seek their personal identity if they take the initiative to do so. digital.library.unt.edu/ark:/67531/metadc801916/
Cytotoxicity and Functional Toxicity of Mefloquine and Search for Protective Compounds
Mefloquine hydrochloride is an antimalarial agent that has been used for the past 40 years. Numerous reports of neurological side effects have recently led the FDA to issue a strong warning regarding long-term neurological effects. This warning lead to the U.S. Army’s Special Forces and other components to discontinue its use in July of 2013. Despite reported adverse side effects, mefloquine remains in circulation and is recommended to travelers going to specific Asian countries. Mefloquine has been used as a treatment for those already infected with the malaria parasite (blood concentrations ranging from 2.1 to 23 µM), and as prophylaxis (blood concentrations averaging 3.8 µM) (Dow 2003). The purpose of this study was to quantify Mefloquine’s toxicity using spontaneously active nerve cell networks growing on microelectrode arrays in vitro and to identify compounds that alleviate or reduce toxic effects. The current literature on mefloquine toxicity is lacking electrophysiological data. These data will contribute to research on the mechanism of adverse side effects associated with mefloquine use. Sequential titration experiments were performed by adding increasing concentrations of mefloquine solution to cultured neurons. Network responses were quantified and reversibility was examined. In each network, activity decreases were normalized as a percent of reference activity yielding a mean IC50 value of 5.97 ± 0.44 (SD) µM (n=6). After total activity loss, no activity was recovered with two successive medium changes. To test for network response desensitization resulting from sequential applications over 5-6 hr periods, one-point titrations at varying concentrations were conducted with fresh networks. These experiments yielded a single concentration response curve with an IC50 value of 2.97 µM. This represents a statistically significant shift (p < 0.0001) to lower concentrations of mefloquine, demonstrating that sequential applications result in network desensitization. After mefloquine exposures, cells were evaluated for irreversible cytotoxic damage. Over a 12-hour period under 6 µM mefloquine, process beading and granulation of somal cytoplasm were observed. At 8 µM mefloquine cell stress was apparent after only 10 minutes with major glial damage and process beading at 120 minutes. In this study, quinolinic acid served as a neuroprotectant at 20 µM. There have been multiple studies on the endogenous concentrations of quinolinic acid and current literature is quite variable. Immunocompromised individuals have some of the highest blood levels of quinolinic acid (up to 20 µM). With 30 min pre-applications of quinolinic acid, the mefloquine IC50 value shifted from 5.97 ± 0.44 µM (n=6), to 9.28 ± 0.55 µM (n=3). This represents a statistically significant change to higher mefloquine concentrations and demonstrates neuroprotection. digital.library.unt.edu/ark:/67531/metadc801913/
Applications of Single Reference Methods to Multi-Reference Problems
Density functional theory is an efficient and useful method of solving single-reference computational chemistry problems, however it struggles with multi-reference systems. Modifications have been developed in order to improve the capabilities of density functional theory. In this work, density functional theory has been successfully applied to solve multi-reference systems with large amounts of non-dynamical correlation by use of modifications. It has also been successfully applied for geometry optimizations for lanthanide trifluorides. digital.library.unt.edu/ark:/67531/metadc801919/
Grand Canyons: Authoritative Knowledge and Patient-Provider Connection
In 2011, African Americans in Tarrant County, Texas experienced an infant mortality rate of 14.3 per 1,000 live births. The leading cause of infant mortality in Tarrant County is prematurity and maternal nutritional status. Both maternal under-nutrition and over-nutrition are known risk factors for premature birth. Improving maternal nutrition, by reducing rates of gestational diabetes and preeclampsia, and by increasing consumption of essential prenatal vitamins and nutrients, is a road to decreasing preterm birth in African Americans. This qualitative study, based on both anthropology and public health theory, of the nutrition behavior of a group of African American expectant mothers and the experience of their health care providers and co-facilitators had a goal to provide a foundation for future development of nutrition behavior research and education for this specific population. The main finding of this study was the substantial gap of lived experience and education between the patients and their providers and co-facilitators, which hinders delivery of care and the patients’ acquiescence to nutrition recommendations. The discrepancies between the authoritative knowledge of the providers and the bodily knowledge of expectant mothers were responsible for the ineffectiveness of nutrition recommendations. digital.library.unt.edu/ark:/67531/metadc799543/
Yummy Starts: A Constructional Approach to Food Selectivity with Children with Autism
Food selectivity exhibited by children with autism creates a myriad of barriers for families and children, ranging from social to nutritional. The typical approach to food selectivity is pathological. The pathological approach attempts to eliminate food selectivity through the use of techniques such as escape extinction. While successful in decreasing aspects of food challenges, such as food refusals, the pathological approach does not necessarily establish desired responses to foods or mealtimes (e.g., favorable affect, approach, generalized sampling, etc.). The purpose of the current study was to explore an alternative, constructional approach to food challenges presented by two children diagnosed with autism. This approach focuses on the development of favorable responses to food through the use of shaping. Furthermore, the shaping process involved a conceptual and procedural widening of the stimulus and response classes selected. The results of a non-concurrent multiple baseline experiment, suggest this approach was successful in expanding the number of food the children tasted and ate while maintaining favorable or neutral affect and child assent. digital.library.unt.edu/ark:/67531/metadc799526/
Networks of Social Debt in Early Modern Literature and Culture
This thesis argues that social debt profoundly transformed the environment in which literature was produced and experienced in the early modern period. In each chapter, I examine the various ways in which social debt affected Renaissance writers and the literature they produced. While considering the cultural changes regarding patronage, love, friendship, and debt, I will analyze the poetry and drama of Ben Jonson, Lady Mary Wroth, William Shakespeare, and Thomas Middleton. Each of these writers experiences social debt in a unique and revealing way. Ben Jonson's participation in networks of social debt via poetry allowed him to secure both a livelihood and a place in the Jacobean court through exchanges of poetry and patronage. The issue of social debt pervades both Wroth's life and her writing. Love and debt are intertwined in the actions of her father, the death of her husband, and the themes of her sonnets and pastoral tragicomedy. In Shakespeare’s The Merchant of Venice (c. 1596), Antonio and Bassanio’s friendship is tested by a burdensome interpersonal debt, which can only be alleviated by an outsider. This indicated the transition from honor-based credit system to an impersonal system of commercial exchange. Middleton’s A Trick to Catch the Old One (1608) examines how those heavily in debt dealt with both the social and legal consequences of defaulting on loans. digital.library.unt.edu/ark:/67531/metadc799514/
Penumbra
This thesis consists of a collection of poems. The poems entail a discussion of the weight of human decisions with regards to gender, sexuality, music, religion, and environment. A great deal of these pieces are in conversation with a type of death or an eclipsed ending in order to examine the outcome of each varied individual response to mortality. digital.library.unt.edu/ark:/67531/metadc799528/
Plebiscites
This study investigates factors that can influence leaders to use plebiscites to settle territorial claims. A quick survey of the plebiscite literature shows that the method has been extensively mentioned in the legal, historical, and philosophical fields (mostly through case studies) but less so in political science. This thesis is the first attempt, to my knowledge, to quantitatively investigate the different factors that can influence a leader to use a plebiscite. Using the latest version of the ICOW dataset, I test political and economic theories to try to explain the variation in the decision outcome. This study includes the following variables: identity ties, economic strength, an interaction between identity ties and economic strength, internal constraints (regime type and violent interaction), and external constraints (membership to international organizations). The results suggest that identity ties offer the strongest explanation as to why leaders settle a territorial claim with a plebiscite. Plebiscites have been rarely used to settle territorial claims, but when used they tend to settle cases permanently. This thesis serves as an attempt to revive a method that while difficult to agree upon, can be successful in resolving territorial claims permanently, and more importantly peacefully. digital.library.unt.edu/ark:/67531/metadc799507/
The Spiritual but Not Religious: Who Are They, and Who Is More Likely to Be One?
The “spiritual but not religious” (SBNR) are a rising social group in America in the past two decades, but social scientists and the general public know quite little about this group. Using the pooled 2006, 2008, 2010, and 2012 GSS data, this study examines who the SBNR are and who is more or less likely to be SBNR controlling for other variables. Descriptive analysis reveals that, compared to the general U.S. adult population, the SBNR group has slightly more males, is slightly younger, has fewer racial minorities, is better educated, and is slightly higher in social class. Additionally, more SBNR are from the Northeast and West than the general population, are slightly more urban, fewer are currently married, fewer have children, more have had homosexual sex, and more were religious Nones when they were 16 years old. Logistic regression analysis of the SBNR finds that, holding other variables constant, Americans who are more educated, live in Northeastern or Western regions, have homosexual sex, or had no religion at age 16 are more likely to be SBNR than their respective counterparts. Those who are racial minorities, live in the South or the Midwest, are currently married, or have children are less likely to be SBNR than their respective counterparts. Gender, age, social class, full-time work status, and metropolitanism of area do not make a significant difference. The implications of the findings for the research of religion and spirituality are discussed. digital.library.unt.edu/ark:/67531/metadc799544/
Assessing Workplace Design: Applying Anthropology to Assess an Architecture Firm’s Own Headquarters Design
Corporations, design firms, technology, and furniture companies are rethinking the concept of the ‘workplace’ environment and built ‘office’ in an effort to respond to changing characteristics of the workplace. The following report presents a case study, post-occupancy assessment of an architecture firm’s relocation of their corporate headquarters in Dallas, TX. This ethnographic research transpired from September 2013 to February 2014 and included participant observation, employee interviews, and an office-wide employee survey. Applying a user-centered approach, this study sought to identify and understand: 1) the most and least effective design elements, 2) unanticipated user-generated (“un-designed”) elements, 3) how the workplace operates as an environment and system of design elements, and 4) opportunities for continued improvement of their work environment. This study found that HKS ODC successfully increased access to collaborative spaces by increasing the size (i.e. number of square feet, number of rooms), variety of styles (i.e. enclosed rooms, open work surfaces), and distribution of spaces throughout the office environment. An increase in reported public transit commuting from 6.5% at their previous location to 24% at HKS ODC compares to almost five times the national public transit average (5%) and fifteen times the rate of Texas workers (1.6%) and Dallas-Fort Worth-Arlington, TX Metro Area (1.5%). This supports the real estate decision and design intent of the office that relocating near public transit would increase use (nearly six times that of reported use at 1919 McKinney, 6.5%). Additional findings and discussion relate to HKS ODC’s design enabling increased access to natural light and improved air quality, increased cross-sector collaboration, increased connection to downtown Dallas and engagement with the larger Dallas architectural community, as well as the open office environment encouraging education between all employee levels. Discrepancies between designed ‘flexibility’ and work away from the desk are explored along with the role of technology to facilitate work without replacing face-to-face interaction. This work also identifies key challenges with the design and employee experience and provides recommendations for addressing areas of concern for continued improvement of the workplace design. Continued user-centered research in the field of workplace design is necessary to assess the effect of current interventions in other office environments for comparison and inform future endeavors. digital.library.unt.edu/ark:/67531/metadc799508/
Through an Open Window
The poems in this collection are elegiac; celebrations of losses and failures, tributes to the daily doldrums that are at the center of human experience. They threaten to expose the uncertainty that exists and refuses to exist in our everyday lives. They explore the otherness associated with the individual and often turn to the universal formulas of music and physics to make order of the world around them. Often times the Speaker finds that the seeming chaos manifests within her already orderly life, the daily routines of work and family. Poetic magic, so to speak, weds this ordered chaos to the laws of nature and its routines, especially birds, which makes a recurrent appearance throughout the manuscript. digital.library.unt.edu/ark:/67531/metadc799530/
Dismantling the Psychiatric Ghetto: Evaluating a Blended-Clinic Approach to Supportive Housing in Houston, Texas.
Locational decisions based on stigma and low funding have handicapped the efficiency of community based mental healthcare in the United States since 1963. However, the pattern of services in the 21st century American South remains largely unknown. This thesis addresses this gap in knowledge by using a mixed methodology including location allocation, descriptive statistics, and qualitative site visits to explore the geography of community clinics offering both physical and mental health services. The City of Houston has proposed using these facilities to anchor new supportive housing, but introducing more fixed costs to a mismatched system could create more problems than solutions. The findings of this study suggest the presence of an unnecessary concentration of services in the central city and a spatial mismatch between accessible clinics and the poor, sick people in need. Furthermore, this research reveals a new suburban pattern of vulnerability, calling into question long-held assumptions about the vulnerability of the inner city. Building supportive housing around existing community clinics, especially in the central city, may further concentrate vulnerable people thereby contributing to intensifying patterns of service-seeking drift and the continued traumatization of mentally ill homeless persons in Houston. digital.library.unt.edu/ark:/67531/metadc799532/
Why Be Friends? Amicus Curiae Briefs in State Courts of Last Resort
While there has been a substantial body of research on interest group activity in U.S. federal courts, there has been comparatively little analysis of interest group engagement with state courts. Given that state courts adjudicate the vast majority of cases in the American legal system and very few cases are appealed to the Supreme Court, understanding why organized interests participate in these courts is of great importance. The present study analyzes interest group involvement as amicus curiae in all state courts of last resort from 1995-1999 to examine what factors motivate organized interests to turn to the courts. The results indicate that interest groups are primarily motivated by their policy goals in deciding which cases to file amicus briefs in, but that they are limited in their ability to file by institutional constraints unique to state courts of last resort. This research provides insight into interest group behavior, state courts and the role organized interests play in influencing legal outcomes in the American states. digital.library.unt.edu/ark:/67531/metadc799518/
Associations Between Physical Fitness and Academic Achievement: A Meditational Analysis
Research has illustrated the interrelatedness of childhood physical fitness and psychological wellbeing, psychological wellbeing and academic achievement, as well as physical fitness and academic achievement. In this study, we proposed that psychological wellbeing (self-esteem and depression) serves as a mediator between physical fitness and academic achievement during adolescence. In a sample of middle school children (N = 1,530), significant correlations were found between all three variables (p.0001). A hierarchical regression analysis was performed to assess the associations between physical fitness, psychological wellbeing, and academic achievement. The regression analysis reported a significant partial mediation effect. The results of this study supported the proposed hypotheses, including a mechanism of psychological wellbeing partially mediating the relationship between physical fitness and academic achievement. The findings of this study support the importance of encouraging activities to promote both physical fitness and psychological wellbeing in schools. digital.library.unt.edu/ark:/67531/metadc799486/
The Relation Between Exposure to Intimate Partner Violence and Dating Violence in a Social Information Processing Model Among Young Adults
Dating violence (DV) among young adults, specifically in college settings, is a serious issue with potential severe repercussions – both physically and psychologically – for victims of DV (DV victimization), and even financially on societal institutions as a whole. Exposure to parental intimate partner violence (IPV) has been associated with DV in young adults. Such violent behaviors appear to be associated with a recurrent pattern of aggressive thought processes, content, and arousing emotions. This study investigated the mediating effects of explicit socio-cognitive processes, through the reformulated social information processing (SIP) model, and implicit cognitive processes for exposure to parental IPV on DV perpetration and victimization, as well as the moderating effects of identification with parental figures and emotional arousal for exposure to parental IPV on predicting DV perpetration and victimization. 85 college students (men n = 23, M age = 22.29) were recruited for the study and results revealed that exposure to father-to-mother IPV predicted DV victimization, and that the interaction between exposure to father-to-mother IPV and identification with maternal figure predicted DV victimization. Conversely, identification with a parental figure negatively predicted DV victimization. The results revealed that SIP processes did not mediate the relationship for exposure to parental IPV on DV perpetration, however, SIP process of aggressive responding was positively associated with exposure to father-to-mother IPV and DV perpetration. Next, interaction of exposure to mother-to-father IPV and positive affective arousal is associated with less severe SIP hostile attributions and less positive evaluations of aggression responses. Finally, implicit cognition did not mediate exposure to parental IPV and DV perpetration. digital.library.unt.edu/ark:/67531/metadc799477/
WiFi Networks through Directional Antenna: An Experimental Study
In situations where information infrastructure is destroyed or not available, on-demand information infrastructure is pivotal for the success of rescue missions. In this paper, a drone-carried on demand information infrastructure for long-distance WiFi transmission system is developed. It can be used in the areas including emergency response, public event, and battlefield. The WiFi network can be connected to the Internet to extend WiFi access to areas where WiFi and other Internet infrastructures are not available. In order to establish a local area network to propagate WIFI service, directional antennas and wireless routers are used to create it. Due to unstable working condition on the flying drones, a precise heading turning stage is designed to maintain the two directional antennas facing to each other. Even if external interferences change the heading of the drones, the stages will automatically rotate back to where it should be to offset the bias. Also, to maintain the same flying altitude, a ground controller is designed to measure the height of the drones so that the directional antennas can communicate to each other successfully. To verify the design of the whole system, quite a few field experiments were performed. Experiments results indicates the design is reliable, viable and successful. Especially at disaster areas, it’ll help people a lot. digital.library.unt.edu/ark:/67531/metadc799469/
BK1 and DCD1 Act Synergistically in Subsidiary Cell Formation in Zea Mays.
Subsidiary mother cell (SMC) divisions during stomatal complex formation in Zea mays are asymmetric generating a small subsidiary cell (SC) and a larger epidermal cell. Mutants with a high number of abnormally shaped subsidiary cells include the brick1 (brk1) and discordia1 (dcd1) mutants. BRK1 is homologous to HSPC300, an ARP2/3 complex activator, and is involved in actin nucleation while DCD1 is a regulatory subunit of the PP2A phosphatase needed for microtubule generation (Frank and Smith, 2002; Wright et al. 2009). Possible causes of the abnormal SCs in brk1 mutants include a failure of the SMC nucleus to polarize in advance of mitosis, no actin patch, and transverse and/or no PPBs (Gallagher and Smith, 2000; Panteris et al 2006). The abnormal subsidiary mother cell division in dcd1 is due to correctly localized, but disorganized preprophase bands (PPBs; Wright et al. 2009). The observation that brk1 has defects in PPB formation and that the dcd1 phenotype is enhanced by the application of actin inhibitors led us to examine the dcd1; brk1 double mutant (Gallagher and Smith, 1999). We found that dcd1; brk1 double mutants demonstrate a higher percentage of aberrant SCs than the single mutants combined suggesting that these two mutations have a synergistic and additive effect on SC formation. Our observations and results are intriguing and the future step will be to quantitate the abnormal PPBs and phragmoplasts in the double and single mutants using immunolocalization of tubulin and actin as well as observations of live cells expressing tubulin-YFP. digital.library.unt.edu/ark:/67531/metadc799473/
Sleep Duration, Sleep Insufficiency, and Carotid Intima-Media Thickness
Cardiovascular disease is the leading cause of death in the United States. Chronic short sleep duration is also a significant public health problem and has been linked to several markers and outcomes of cardiovascular disease. To date, inconsistency of assessments of sleep duration and insufficiency, use of covariates, and cardiovascular disease measurement across studies limits strong conclusions about the relationship between sleep duration, sleep insufficiency, and cardiovascular disease. The current study examined the association between sleep duration, sleep insufficiency, and a marker of preclinical coronary heart disease (i.e., carotid intima-media thickness) in a community sample using a cross-sectional design. Some evidence for a relationship between sleep duration and cIMT was found, with longer sleep duration predicting higher cIMT in some segments. Additionally, the interaction between sleep duration and sleep insufficiency was significant. However, neither of these effects were significant after adjusting for age and in some cases race/ethnicity, suggesting demographics may explain this association. Actigraphy and sleep diary duration assessments demonstrated significantly different correlations with cIMT in some segments, suggesting the nature of the assessment method may impact the strength or direction of the relationship between sleep duration and cIMT. Limitations and future directions are discussed. digital.library.unt.edu/ark:/67531/metadc799484/
Deleterious Synergistic Effects of Concurrent Magnetic Field and Superparamagnetic (Fe3O4) Nanoparticle Exposures on CHO-K1 Cell Line
While many investigations have been performed to establish a better understanding of the effects that magnetic fields and nanoparticles have on cells, the fundamental mechanisms behind the interactions are still yet unknown, and investigations on concurrent exposure are quite limited in scope. This study was therefore established to investigate the biological impact of concurrent exposure to magnetic nanoparticles and extremely-low frequency magnetic fields using an in-vitro CHO-K1 cell line model, in an easily reproducible manner to establish grounds for further in-depth mechanistic, proteomic, and genomic studies. Cells were cultured and exposed to 10nm Fe3O4 nanoparticles, and DC or low frequency (0Hz, 50Hz, and 100Hz) 2.0mT magnetic fields produced by a Helmholtz coil pair. The cells were then observed under confocal fluorescence microscopy, and subject to MTT biological assay to determine the synergistic effects of these concurrent exposures. No effects were observed on cell morphology or microtubule network; however, cell viability was observed to decrease more drastically under the combined effects of magnetic field and nanoparticle exposures, as compared to independent exposures alone. It was concluded that no significant difference was observed between the types of magnetic fields, and their effects on the nanoparticle exposed cells, but quite clearly there are deleterious synergistic effects of these concurrent magnetic field and nanoparticle exposure conditions. digital.library.unt.edu/ark:/67531/metadc799479/
The Nothingness of Presence: Sound, Ritual, and Encounter in the Music of Into Your Hands
The ritual music written for the Compline service of the Liturgy of the Hours, Into Your Hands, is analyzed using an ontological and phenomenological approach, which seeks to answer how such sound/musical phenomena wed to the specific ritual dynamics of Compline in their own right can create a potential for encounter with the Divine. The Jewish philosopher Martin Buber’s understanding of encounter is used to show that the sound/musical phenomena in itself bears similarities with the nature of the Judeo/Christian God, and such a nature is revealed to be both irreducibly non-conceptual as well as an entity that establishes the ontological actuality of one’s being. Studies in the beginnings of humanity at large as well as the beginnings of the individual fetus reveal that an integrated expression of music and ritual can be said to have formed the impetus of such ontological beginnings through encounter. Therefore, one of the first sounds heard in the womb - that of water (or amniotic fluid) - constitutes what may be an archetypal sound of encounter. The phenomenological effects of such an archetype are analyzed in the music of Into Your Hands through topics such as the loss of aural perspective, immersion, dynamic swells, cyclic harmonic progressions, and simultaneity. Works of other composers who use similar techniques are discussed. digital.library.unt.edu/ark:/67531/metadc799480/
An Interactive Framework for Teaching Fundamentals of Digital Logic Design and VLSI Design
Integrated Circuits (ICs) have a broad range of applications in healthcare, military, consumer electronics etc. The acronym VLSI stands for Very Large Scale Integration and is a process of making ICs by placing millions of transistors on a single chip. Because of advancements in VLSI design technologies, ICs are getting smaller, faster in speed and more efficient, making personal devices handy, and with more features. In this thesis work an interactive framework is designed in which the fundamental concepts of digital logic design and VLSI design such as logic gates, MOS transistors, combinational and sequential logic circuits, and memory are presented in a simple, interactive and user friendly way to create interest in students towards engineering fields, especially Electrical Engineering and Computer Engineering. Most of the concepts are explained in this framework by taking the examples which we see in our daily lives. Some of the critical design concerns such as power and performance are presented in an interactive way to make sure that students can understand these significant concepts in an easy and user friendly way. digital.library.unt.edu/ark:/67531/metadc799495/
Considering Canine Companionship: An Examination of Dog Owner Travel Desires Using the Model of Goal-Directed Behavior.
The purpose of this study is to investigate how internal and external sources influence dog owners’ desire and intent to travel with their dogs, using the model of goal-directed behavior (MGB). Specifically, this study investigates 1) the demographic profile of participating dog owners, 2) the relationship between dog owners’ Anticipated Emotions (AE) and their desire to travel with their dogs, 3) dog owners’ Attitudes toward the act (Aact) of traveling with their dogs and its relationship with their desire to travel with dogs, 4) the relationship between Subjective Norms (SN) and dog owners desire to travel with dogs, 5) owners’ Perceived Behavioral Control (PBC) over their dog-accompanied travel situation, 6) the relationship between desire for dog-accompanied travel and Behavioral Intent (BI), and 7) the relationship between Past Behavior (PB) and the desire and BI regarding future travel with dogs. digital.library.unt.edu/ark:/67531/metadc799478/
My Brother’s Keeper
My Brother’s Keeper is a Documentary Film developed to explore the life of John Dillinger. It examines the legendary criminal through the memories of Frances Dillinger Thompson, his last remaining sibling. The film attempts to understand John Dillinger by exposing his intimate childhood relationship with his sister, and the burdens his actions left on her. digital.library.unt.edu/ark:/67531/metadc799516/
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