You limited your search to:

  Partner: UNT Libraries
 Resource Type: Thesis or Dissertation
Why Be Friends? Amicus Curiae Briefs in State Courts of Last Resort

Why Be Friends? Amicus Curiae Briefs in State Courts of Last Resort

Date: December 2014
Creator: Perkins, Jared D.
Description: 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.
Contributing Partner: UNT Libraries
Synthesis and Characterization of Ion Beam Assisted Silver Nanosystems in Silicon Based Materials for Enhanced Photocurrent Collection Efficiency

Synthesis and Characterization of Ion Beam Assisted Silver Nanosystems in Silicon Based Materials for Enhanced Photocurrent Collection Efficiency

Date: May 2015
Creator: Dhoubhadel, Mangal S.
Description: In recent years a great deal of interest has been focused on the synthesis of transitional metal (e.g. Ag, Cu, Fe, Au) nanosystems at the surface to sub-surface regions of Si and SiO2 matrices for fundamental understanding of their structures as well as for development of technological applications with enhanced electronic and optical properties. The applications of the metal nanoparticle or nanocluster (NC) systems range from plasmonics, photovoltaic devices, medical, and biosensors. In all of these applications; the size, shape and distribution of the metallic NCs in the silicon matrix play a key role. Low energy ion implantation followed by thermal annealing (in vacuum or gas environment) is one of the most suitable methods for synthesis of NCs at near surfaces to buried layers below the surfaces of the substrates. This technique can provide control over depth and concentration of the implanted ions in the host matrix. The implanted low energy metal ions initially amorphizes the Si substrates while being distributed at a shallow depth near the substrate surface. When subject to thermal annealing, the implanted ions agglomerate to form clusters of different sizes at different depths depending upon the fluence. However, for the heavier ions implanted with high fluences ...
Contributing Partner: UNT Libraries
Associations Between Physical Fitness and Academic Achievement: A Meditational Analysis

Associations Between Physical Fitness and Academic Achievement: A Meditational Analysis

Date: May 2015
Creator: Dorfman, Jocelyn C.
Description: 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.
Contributing Partner: UNT Libraries
The Relation Between Exposure to Intimate Partner Violence and Dating Violence in a Social Information Processing Model Among Young Adults

The Relation Between Exposure to Intimate Partner Violence and Dating Violence in a Social Information Processing Model Among Young Adults

Date: May 2015
Creator: Chong, Chu Chian
Description: 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 ...
Contributing Partner: UNT Libraries
WiFi Networks through Directional Antenna: An Experimental Study

WiFi Networks through Directional Antenna: An Experimental Study

Date: May 2015
Creator: Gu, Yixin
Description: 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, ...
Contributing Partner: UNT Libraries
BK1 and DCD1 Act Synergistically in Subsidiary Cell Formation in Zea Mays.

BK1 and DCD1 Act Synergistically in Subsidiary Cell Formation in Zea Mays.

Date: August 2014
Creator: Malhotra, Divya
Description: 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 ...
Contributing Partner: UNT Libraries
A Structural and Psychometric Evaluation of a Situational Judgment Test: The Workplace Skills Survey

A Structural and Psychometric Evaluation of a Situational Judgment Test: The Workplace Skills Survey

Date: August 2014
Creator: Wei, Min
Description: Some basic but desirable employability skills are antecedents of job performance. The Workplace Skills Survey (WSS) is a 48-item situational judgment test (SJT) used to assess non-technical workplace skills for both entry-level and experienced workers. Unfortunately, the psychometric evidence for use of its scores is far from adequate. The purpose of current study was two-fold: (a) to examine the proposed structure of WSS scores using confirmatory factor analysis (CFA), and (b) to explore the WSS item functioning and performance using item response theory (IRT). A sample of 1,018 Jamaican unattached youth completed the WSS instrument as part of a longitudinal study on the efficacy of a youth development program in Jamaica. Three CFA models were tested for the construct validity of WSS scores. Parameter estimations of item difficulty, item discrimination, and examinee’s proficiency estimations were obtained with item response theory (IRT) and plotted in item characteristics curves (ICCs) and item information curves (IICs). Results showed that the WSS performed quite well as a whole and provided precise measurement especially for respondents at latent trait levels of -0.5 and +1.5. However, some modifications of some items were recommended. CFA analyses showed supportive evidence of the one-factor construct model, while the six-factor ...
Contributing Partner: UNT Libraries
Interaction of Plasmons and Excitons for Low-Dimension Semiconductors

Interaction of Plasmons and Excitons for Low-Dimension Semiconductors

Access: Use of this item is restricted to the UNT Community.
Date: December 2014
Creator: Lin, Jie
Description: The effects of surface plasmon for InGaN/GaN multi-quantum wells and ZnO nanoparticles optical linear and nonlinear emission efficiency had been experimentally studied. Due to the critical design for InGaN MQWs with inverted hexagonal pits based on GaN, both contribution of surface plasmon effect and image charge effect at resonant and off resonant frequencies were experimentally and theoretically investigated. With off- resonant condition, the InGaN MQWs emission significantly enhanced by metal nanoparticles. This enhancement was caused by the image charge effect, due to the accumulation of carriers to NPs region. When InGaN emission resonated with metal particles SP modes, surface Plasmon effect dominated the emission process. We also studied the surface plasmon effect for ZnO nanoparticles nonlinear optical processes, SHG and TPE. Defect level emission had more contribution at high incident intensity. Emissions are different for pumping deep into the bulk and near surface. A new assumption to increase the TPE efficiency was studied. We thought by using Au nanorods localized surface plasmon mode to couple the ZnO virtual state, the virtual state’s life time would be longer and experimentally lead the emission enhancement. We studied the TPE phenomena at high and near band gap energy. Both emission intensity and decay ...
Contributing Partner: UNT Libraries
Sleep Duration, Sleep Insufficiency, and Carotid Intima-Media Thickness

Sleep Duration, Sleep Insufficiency, and Carotid Intima-Media Thickness

Date: May 2015
Creator: Dietch, Jessica R.
Description: 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.
Contributing Partner: UNT Libraries
Deleterious Synergistic Effects of Concurrent Magnetic Field and Superparamagnetic (Fe3O4) Nanoparticle Exposures on CHO-K1 Cell Line

Deleterious Synergistic Effects of Concurrent Magnetic Field and Superparamagnetic (Fe3O4) Nanoparticle Exposures on CHO-K1 Cell Line

Date: May 2015
Creator: Coker, Zachary
Description: 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 ...
Contributing Partner: UNT Libraries