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Ultrafast Laser Sampling of a Plant Tissue and ion Conductivity Measurement for Investigation of Light Stress Generation Mechanisms (open access)

Ultrafast Laser Sampling of a Plant Tissue and ion Conductivity Measurement for Investigation of Light Stress Generation Mechanisms

In this study we applied ultra-short laser pulses on a biological sample (Arabidopsis), in order to cut it precisely in a square pattern and subsequently use it for studying stress generation mechanisms. For this purpose, we utilized femtosecond laser pulses at 100 fs pulse width and 80 MHz repetition rate. We took two processing parameters into consideration such as laser power, laser exposure time which is related to the stage speed. Therefore, we were able to find the laser optimum conditions for ablation of biological tissues. The mutant and wildtype (control) obtained from laser cutting with a size of 500 µm × 500 µm were directly transferred (in-situ with laser cutting) into a microfabricated chamber containing ~500 nanoliters deionized water for measuring ion conductivity. The ion conductivity is a signature of cell-death mechanisms caused by various stresses. A light with intensity of 100 µmol was exposed to the samples for 2 hours and 20 minutes as a source of stress. A quantitative electrical analysis with high accuracy was assured by utilizing a microchamber, which enables a measurement in nanoliter volume. We measured the impedance which is reciprocal of conductivity using a lock-in amplifier and a precise current source at frequency …
Date: August 2010
Creator: Abtahi, Seyed Ali
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Faculty Members' Readiness for E-learning in the College of Basic Education in Kuwait (open access)

Faculty Members' Readiness for E-learning in the College of Basic Education in Kuwait

E-learning exposes students and instructors to different learning models such as constructivism rather than the traditional learning. E-learning as a part of today's technology has proven that it is appropriate for most students' mentalities and is a mind tool which promotes different learning models, such as problem solving strategy, collaborative learning, and critical thinking. The Public Authority for Applied Education and Training (PAAET) in Kuwait consists of more than 10 academic colleges with a total number of 120 faculty members. The College of Basic Education (CBE) is one of them. The implementation of e-learning at the College of Basic Education requires that all the learning community members, instructors and students, understand that an e-learning course is like a learning community with the privilege of sharing knowledge, opinions, experiences related to class subject, and productive outcomes that are beneficial to this learning community. This study indentified the statistically significant differences in demographic characteristics of e-learning adopters and non-adopters among faculty members at CBE, examining faculty members' attitudes and skills toward e-learning readiness. The study will explore perceived barriers that face e-learning at CBE. Applying the Rogers diffusion of innovation theory, the influence of 4 factors was examined regarding faculty readiness for …
Date: August 2010
Creator: Alajmi, Mohammed
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Family Sex Talk: Analyzing the Influence of Family Communication Patterns on Parent and Late Adolescent's Sex Conversations (open access)

Family Sex Talk: Analyzing the Influence of Family Communication Patterns on Parent and Late Adolescent's Sex Conversations

Family communication has the potential to affect a variety of youth behavioral outcomes including adolescent sexual risk behavior. Within chapter 1, I present past literature on adolescent sexual risk behaviors, family communication patterns, and the gaps associated with those areas. In chapter 2, I review previous literature on adolescent sexual risk behavior, parent-child communication and family communication patterns. In chapter 3, I present the method which includes a description of the participants, procedures, measures, and data analysis used. In Chapter 4, I present the results of the study. According to the results of the study, father-child communication is not a better predictor of adolescent sexual risk behavior. A higher quantity of parent-child communication does not lead to less adolescent sexual risk behavior. Participants with a pluralistic family type do significantly differ from laissez-faire and protective family types in regards to levels of parent-child communication. Participants with a consensual family type do have significantly higher levels of parent-child communication in comparison to laissez-faire family types, but not protective family types. Finally, in chapter 5, I present the discussion with a review of previous research (consistent or inconsistent with the current findings), limitations and conclusions for the current study.
Date: August 2010
Creator: Allen, Evette L.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Works for Clarinet Commissioned by the Concours International d'Exécution Musicale de Genève: A Critical Survey and Performance Guide (open access)

The Works for Clarinet Commissioned by the Concours International d'Exécution Musicale de Genève: A Critical Survey and Performance Guide

Beginning in 1939, the Concours International d'Exécution Musicale de Genève (CIEM; Geneva International Music Competition) is unique among international music competitions in its multidisciplinary approach. To date, fifteen works have been commissioned for clarinet for the years in which the clarinet was involved. The most well-known of these works is the unaccompanied work by Heinrich Sutermeister, Capriccio for Solo Clarinet in A, written in 1946 for the 1947 competition. This work is a staple in the unaccompanied clarinet repertoire. However, the other fourteen works commissioned for the competition are little known and to date no document has been prepared that examines each of these works in the context of the competition and clarinet literature. While perhaps less notable, works were also commissioned for a sight reading portion of the competition for many of the years in which the clarinet was a discipline chosen for the competition, two of which were published. These works are examined as well. This survey provides a critical, analytical, historical, performance-related and biographical review of the published and unpublished works commissioned for the clarinet by CIEM. The composers, competitors and the significance of these works and winners in the clarinet literature and history are included. A …
Date: August 2010
Creator: Allgeier, Anthony Joseph, III
Object Type: Thesis or Dissertation
System: The UNT Digital Library
A Spatially Explicit Environmental Health Surveillance Framework for Tick-Borne Diseases (open access)

A Spatially Explicit Environmental Health Surveillance Framework for Tick-Borne Diseases

In this paper, I will show how applying a spatially explicit context to an existing environmental health surveillance framework is vital for more complete surveillance of disease, and for disease prevention and intervention strategies. As a case study to test the viability of a spatial approach to this existing framework, the risk of human exposure to Lyme disease will be estimated. This spatially explicit framework divides the surveillance process into three components: hazard surveillance, exposure surveillance, and outcome surveillance. The components will be used both collectively and individually, to assess exposure risk to infected ticks. By utilizing all surveillance components, I will identify different areas of risk which would not have been identified otherwise. Hazard surveillance uses maximum entropy modeling and geographically weighted regression analysis to create spatial models that predict the geographic distribution of ticks in Texas. Exposure surveillance uses GIS methods to estimate the risk of human exposures to infected ticks, resulting in a map that predicts the likelihood of human-tick interactions across Texas, using LandScan 2008TM population data. Lastly, outcome surveillance uses kernel density estimation-based methods to describe and analyze the spatial patterns of tick-borne diseases, which results in a continuous map that reflects disease rates based …
Date: August 2010
Creator: Aviña, Aldo
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Soldier Boys of Texas: The Seventh Texas Infantry in World War I (open access)

Soldier Boys of Texas: The Seventh Texas Infantry in World War I

This study first offers a political, social, and economic overview of Texas during the first two decades of the twentieth century, including reaction in the Lone Star state to the declaration of war against Germany in April, 1917; the fear of saboteurs and foreign-born citizens; and the debate on raising a wartime army through a draft or by volunteerism. Then, focusing in-depth on northwest Texas, the study examines the Texas National Guard unit recruited there, the Seventh Texas Infantry Regiment. Using primarily the selective service registration cards of a sample of 1,096 members of the regiment, this study presents a portrait of the officers and enlisted soldiers of the Seventh Texas based on age, occupation, marital status, dependents and other criteria, something that has not been done in studies of World War I soldiers. Next, the regiment's training at Camp Bowie, near Fort Worth, Texas, is described, including the combining of the Seventh Texas with the First Oklahoma Infantry to form the 142nd Infantry Regiment of the Thirty-Sixth Division. After traveling to France and undergoing nearly two months of training, the regiment was assigned to the French Fourth Army in the Champagne region and went into combat for the first …
Date: August 2010
Creator: Ball, Gregory W.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
A Training Program to Facilitate Caregiver Involvement in School Meetings (open access)

A Training Program to Facilitate Caregiver Involvement in School Meetings

Caregivers of children with autism will likely meet with many school professionals once their children become school-aged. These meetings can be intimidating for caregivers who are unfamiliar with special education terminology and protocol, and caregivers may feel ineffective when communicating with school personnel. The purpose of this study is to describe a training curriculum to teach caregivers ways in which to communicate during meetings with school professionals, including the kinds of questions to ask/statements to make and when to ask or make them. A detailed overview of the training procedures, the participants, and the outcomes are described here. Preliminary data suggest the training produced increases in communication skills and that caregivers found the training effective and useful.
Date: August 2010
Creator: Barahona, Heather
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Hepatotoxicity of Mercury to Fish (open access)

Hepatotoxicity of Mercury to Fish

Tissue samples from spotted gar (Lepisosteus oculatus) and largemouth bass (Micropterus salmoides) were collected from Caddo Lake. Gar and bass livers were subjected to histological investigation and color analysis. Liver color (as abs at 400 nm) was significantly correlated with total mercury in the liver (r2 = 0.57, p = 0.02) and muscle (r2 = 0.58, p = 0.01) of gar. Evidence of liver damage as lipofuscin and discoloration was found in both species but only correlated with liver mercury concentration in spotted gar. Inorganic mercury was the predominant form in gar livers. In order to determine the role of mercury speciation in fish liver damage, a laboratory feeding study was employed. Zebrafish (Danio rerio) were fed either a control (0.12 ± 0.002 µg Hg.g-1 dry wt), inorganic mercury (5.03 ± 0.309 µg Hg.g-1 dry wt), or methylmercury (4.11 ± 0.146 µg Hg.g-1 dry wt) diet. After 78 days of feeding, total mercury was highest in the carcass of zebrafish fed methylmercury (12.49 ± 0.369 µg Hg.g-1 dry wt), intermediate in those fed inorganic mercury (1.09 ± 0.117 µg Hg.g-1 dry wt), and lowest in fish fed the control diet (0.48 ± 0.038 µg Hg.g-1 dry wt). Total mercury was …
Date: August 2010
Creator: Barst, Benjamin Daniel
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Green Horizon: An (Environmental) Hermeneutics of Identification with Nature through Literature (open access)

The Green Horizon: An (Environmental) Hermeneutics of Identification with Nature through Literature

This thesis is an examination of transformative effects of literature on environmental identity. The work begins by examining and expanding the Deep Ecology concept of identification-with-nature. The potential problems with identification through direct encounters are used to argue for the relevance of the possibility of identification-through-literature. Identification-through-literature is then argued for using the hermeneutic and narrative theories of Hans-Georg Gadamer and Paul Ricoeur, as well as various examples of nature writing and fiction.
Date: August 2010
Creator: Bell, Nathan M.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Keyboard Music of Peter Philips (open access)

The Keyboard Music of Peter Philips

The keyboard works of the English virginalist Peter Philips have been little studied in comparison with his more famous contemporaries, William Byrd, John Bull and Jan Pieterszoon Sweelinck. While Philips left comparatively fewer keyboard works than these composers, his music contains very unique attributes. This study compiles the latest research of Philips' life as well as an analysis of representative works showing many of the individual and uncommon features to be found in Philips' works for keyboard. Pieces from all genres of Philips' keyboard output are represented and discussed, including Pavanes and Galliards, Fantasias and Intabulations of madrigals. Musical examples of each of these works are provided. A description of the instruments needed for the performance of the music and an illustration of the rare type of keyboard instrument required in the Pavana and Galliarda Dolorosa is included. A discussion of Philips' style, particularly regarding ornamentation, is included with a comparison to the works of his contemporaries.
Date: August 2010
Creator: Bennight, Brad
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Effects of a Communication Training Workshop on the Verbal Behavior of Caregivers (open access)

The Effects of a Communication Training Workshop on the Verbal Behavior of Caregivers

This study evaluated the effectiveness of a workshop designed to train adults to use supportive verbal behavior during distressful situations. Participants were trained to provide descriptive, empathetic and hopeful statements using instructions, rationales, modeling, role-play, feedback, and rehearsal. A pre-post design was used to analyze the effects of the training on verbal and non-verbal behaviors of four females during simulation scenarios. Results indicate all four participants provided maximum support statements above pre-training levels during post-training simulation and written assessments.
Date: August 2010
Creator: Blell, Zainab D.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
An Experimental and Theoretical Study of the Reaction Between NH(X3Σ-) + SO(X3Σ-) (open access)

An Experimental and Theoretical Study of the Reaction Between NH(X3Σ-) + SO(X3Σ-)

Article on an experimental and theoretical study of the reaction between NH(X3Σ–) + SO(X3Σ–).
Date: August 3, 2010
Creator: Blitz, Mark A.; Shannon, Robin J.; Marshall, Paul & Pilling, Michael J.
Object Type: Article
System: The UNT Digital Library
Well-Being and Academic Success in Gifted College Students: Early-College Entrants and Honors College Students (open access)

Well-Being and Academic Success in Gifted College Students: Early-College Entrants and Honors College Students

As a society, we seek to have our young people, including the gifted, be healthy and happy, and go to good schools with good teachers. Framed by Sayler's theoretical model of giftedness and thriving, this study examined psychological constructs (i.e. general self-efficacy, theories of intelligence, hope, gratitude, religiosity, disposition, and resiliency) to determine their mediating effect on personal well-being and academic success in gifted college students. The 213 subjects for this study included gifted college students from two distinct programs at the University of North Texas. One hundred twenty-two participants were students from the Texas Academy of Mathematics and Science (TAMS). TAMS is an early-college entrance program allowing gifted students to enter college after their sophomore year of high school. Ninety-one participants attended the UNT Honors College. Honors College students are gifted students who enter college after high school graduation. Latent transition, latent class, general linear model repeated measures, and regression analyses were used in the examination of the data. Results of the study revealed that positive disposition and hope-agency were significantly related to the development of personal well-being for gifted students during their first year of college. The ability to identify pathways to goals and the self-theory of intelligence …
Date: August 2010
Creator: Boazman, Janette Kay
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Molecular systematics of Baird's pocket gopher (Geomys breviceps) (open access)

Molecular systematics of Baird's pocket gopher (Geomys breviceps)

Baird's pocket gopher (Geomys breviceps) is found in eastern Texas, eastern Oklahoma, central and western Arkansas, and western Louisiana. The cytochrome-b gene was sequenced and analyzed for 16 pocket gophers from throughout the range of the species. Similar phylogenetic trees were obtained using maximum-parsimony, maximum-likelihood, neighbor-joining, and Bayesian analyses. Two major clades were formed with northern individuals belonging to clade I and southern individuals belonging to clade II. G. b. sagittalis was paraphyletic in relation to G. b. breviceps in all analyses. Based on inconsistencies between the taxonomic classification and systematic relationships within Baird's pocket gopher, a taxonomic restructuring appears warranted.
Date: August 2010
Creator: Bodine, Deanna Martinez
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Relationship Between Body Dissatisfaction and Eating Disorder Symptomatology: An Examination of Moderating Variables (open access)

The Relationship Between Body Dissatisfaction and Eating Disorder Symptomatology: An Examination of Moderating Variables

The purpose of this study was to examine whether Psychological Well-Being (comprised of self-esteem, optimism, satisfaction with life, and self-determination), perfectionism, body surveillance, and neuroticism moderated the relationship between body dissatisfaction and bulimic symptoms after controlling for social desirability and actual physical size. 847 female undergraduate students participated in the study. Participants completed an online questionnaire packet. An exploratory factor analysis determined that self-determination, optimism, self-esteem, and satisfaction with life loaded on to one factor representing Psychological Well-Being. Hierarchical moderated regression (HMR) was used to control for the influences of social desirability and body mass index on bulimic symptoms and then determine the main and interactive effects of body dissatisfaction and each moderator. Four variables (neuroticism, body surveillance, concern over mistakes, and doubts about actions) strengthened the relationship between body dissatisfaction and bulimic symptomatology, whereas Psychological Well-Being weakened the relationship. Parental expectations, parental criticism, and personal standards did not moderate the relationship between body dissatisfaction and bulimic symptomatology.
Date: August 2010
Creator: Brannan, Megan E.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Southern Promise and Necessity:  Texas, Regional Identity, and the National Woman Suffrage Movement, 1868-1920 (open access)

Southern Promise and Necessity: Texas, Regional Identity, and the National Woman Suffrage Movement, 1868-1920

This study offers a concentrated view of how a national movement developed networks from the grassroots up and how regional identity can influence national campaign strategies by examining the roles Texas and Texans played in the woman suffrage movement in the United States. The interest that multiple generations of national woman suffrage leaders showed in Texas, from Reconstruction through the ratification of the Nineteenth Amendment, provides new insights into the reciprocal nature of national movements. Increasingly, from 1868 to 1920, a bilateral flow of resources existed between national women's rights leaders and woman suffrage activists in Texas. Additionally, this study nationalizes the woman suffrage movement earlier than previously thought. Cross-regional woman suffrage activity has been marginalized by the belief that campaigning in the South did not exist or had not connected with the national associations until the 1890s. This closer examination provides a different view. Early woman's rights leaders aimed at a nationwide movement from the beginning. This national goal included the South, and woman suffrage interest soon spread to the region. One of the major factors in this relationship was that the primarily northeastern-based national leadership desperately needed southern support to aid in their larger goals. Texas' ability to …
Date: August 2010
Creator: Brannon-Wranosky, Jessica S.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Synthesis and Screening of a Combinatorial Peptide Library for Ligands to Target Transferrin: Miniaturizing the Library (open access)

Synthesis and Screening of a Combinatorial Peptide Library for Ligands to Target Transferrin: Miniaturizing the Library

Combinatorial libraries are used in the search for ligands that bind to target proteins. Fmoc solid-phase peptide synthesis is routinely used to generate such libraries. Microwave-assisted peptide synthesis was employed here to decrease reaction times by 80-90%. Two One-Bead-One-Compound combinatorial libraries were synthesized on 130μm beads (one containing 750 members and the other 16, 807). The use of smaller solid supports would have many important practical advantages including; increased library diversity per unit mass, smaller quantities of library needed to generate hits, and screening could be conducted by using a standard flow cytometer. To this end, a miniaturized peptide library was synthesized on 20 μm beads to demonstrate proof of principle. A small sample from the 16,807-member library was screened against transferrin-AlexaFluro 647, a protein responsible for iron transport in vivo. A number of hits were identified and sequenced using techniques coupling nanomanipulation with nanoelectrospray mass spectrometry.
Date: August 2010
Creator: Brown, Jennifer Marie
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Metabolic Engineering of Raffinose-Family Oligosaccharides in the Phloem Reveals Alterations in Patterns of Carbon Partitioning and Enhances Resistance to Green Peach Aphid (open access)

Metabolic Engineering of Raffinose-Family Oligosaccharides in the Phloem Reveals Alterations in Patterns of Carbon Partitioning and Enhances Resistance to Green Peach Aphid

Phloem transport is along hydrostatic pressure gradients generated by differences in solute concentration between source and sink tissues. Numerous species accumulate raffinose-family oligosaccharides (RFOs) in the phloem of mature leaves to accentuate the pressure gradient between source and sinks. In this study, metabolic engineering was used to generate RFOs at the inception of the translocation stream of Arabidopsis thaliana, which transports predominantly sucrose. To do this, three genes, GALACTINOL SYNTHASE, RAFFINOSE SYNTHASE and STACHYOSE SYNTHASE, were expressed from promoters specific to the companion cells of minor veins. Two transgenic lines homozygous for all three genes (GRS63 and GRS47) were selected for further analysis. Sugars were extracted and quantified by high performance anion exchange chromatography with pulsed amperometric detection (HPAEC-PAD), and 21-day old plants of both lines had levels of galactinol, raffinose, and stachyose approaching 50% of total soluble sugar. All three exotic sugars were also identified in phloem exudates from excised leaves of transgenic plants whereas levels were negligible in exudates from wild type leaves. Differences in starch accumulation or degradation between wild type and GRS63 and GRS47 lines were not observed. Similarly, there were no differences in vegetative growth between wild type and engineered plants, but engineered plants flowered …
Date: August 2010
Creator: Cao, Te
Object Type: Thesis or Dissertation
System: The UNT Digital Library
South Texas Catholic (Corpus Christi, Tex.), Vol. 45, No. 12, Ed. 1 Friday, August 20, 2010 (open access)

South Texas Catholic (Corpus Christi, Tex.), Vol. 45, No. 12, Ed. 1 Friday, August 20, 2010

Semi-monthly newspaper from Corpus Christi, Texas published by the Diocese of Corpus Christi that includes news of interest to Diocese members along with advertising.
Date: August 20, 2010
Creator: Cardenas, Alfredo E.
Object Type: Newspaper
System: The Portal to Texas History
Using Financial Rankings to Identify Characteristics of Libraries Serving Highly Profitable Private Law Firms (open access)

Using Financial Rankings to Identify Characteristics of Libraries Serving Highly Profitable Private Law Firms

This purpose of this study was to develop evidence of a relationship between law libraries and private law firm profitability for law library administrators to use when making strategic decisions that influence the value of their libraries. The highest ranked administrator at each private law firm listed on the 2008 Am Law 200 was invited to complete an online benchmarking survey. The adjusted sample population totaled 179 firms. Fifty-one valid surveys were completed for a 28.5% response rate. Descriptive and statistical analyses were conducted using 26 independent variables (law library characteristics) and a single dependent variable, Revenue per Equity Partner, developed from data published for the Am Law 200. The most significant contributions of this study are: development of important law library financial and return on investment benchmarks; a listing of characteristics that have been empirically shown to impact law firm productivity; identification of optimum reporting structure for the law library administrator. Six characteristics positively impact Revenue per Equity Partner: to whom the library Administrator reports, number of library staff per library, number of Library staff per library, range in hourly bill rate for library staff time, practice areas most often supported. Two monetary measures were also established. The cost …
Date: August 2010
Creator: Carroll, Margaret Aby
Object Type: Thesis or Dissertation
System: The UNT Digital Library
A Geoarchaeological Investigation of Site Formation in the Animas River Valley at Aztec Ruins National Monument, NM (open access)

A Geoarchaeological Investigation of Site Formation in the Animas River Valley at Aztec Ruins National Monument, NM

This paper presents an investigation of sedimentary deposition, soil formation, and pedoturbation in the Animas River Valley to determine the provenience of archaeological deposits in an open field at Aztec Ruins National Monument, NM outside of the Greathouse complex. Four stratigraphic pedounits correlated with active fan deposition have been proposed for the lower terrace in the project area with only one of these units retaining strong potential for buried archaeological deposits from the Anasazi late Pueblo II/Pueblo III period. The distal fan on the lower terrace and the Animas River floodplain appear to show poor potential for archaeological deposits either due to shallow sediment overburden with historic disturbance or alluvial activity during or after occupation. Based on these findings, four other zones of similar fan development have been identified throughout the Animas Valley and are recommended for subsurface testing during future cultural resource investigations.
Date: August 2010
Creator: Caster, Joshua
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Triimine Complexes of Divalent Group 10 Metals for Use in Molecular Electronic Devices (open access)

Triimine Complexes of Divalent Group 10 Metals for Use in Molecular Electronic Devices

This research focused on the development of new metal triimine complexes of Pt(II), Pd(II), and Ni(II) for use in three types of molecular electronic devices: dye sensitized solar cells (DSSCs), organic light-emitting diodes (OLEDs), and organic field effect transistors (OFETs). Inorganic complexes combine many advantages of their chemical and photophysical properties and are processable on inexpensive and large area substrates for various optoelectronic applications. For DSSCs, a series of platinum (II) triimine complexes were synthesized and evaluated as dyes for nanocrystalline oxide semiconductors. Pt (II) forms four coordinate square planar complexes with various co-ligands and counterions and leads to spanning absorption across a wide range in the UV-Vis-NIR regions. When those compounds were applied to the oxide semiconductors, they led to photocurrent generation thus verifying the concept of their utility in solar cells. In the OLEDs project, a novel pyridyl-triazolate Pt(II) complex, Pt(ptp)2 was synthesized and generated breakthrough OLEDs. In the solution state, the electronic absorption and emission of the square planar structure results in metal-to-ligand charge transfer (MLCT) and an aggregation band. Tunable photoluminescence and electroluminescence colors from blue to red wavelengths have been attained upon using Pt(ptp)2 under different experimental conditions and OLED architectures. In taking advantage of …
Date: August 2010
Creator: Chen, Wei-Hsuan
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Nominal Shear Strength and Seismic Detailing of Cold-formed Steel Shear Walls using Steel Sheet Sheathing (open access)

Nominal Shear Strength and Seismic Detailing of Cold-formed Steel Shear Walls using Steel Sheet Sheathing

In this research, monotonic and cyclic tests on cold-formed steel shear walls sheathed with steel sheets on one side were conducted to (1) verify the published nominal shear strength for 18-mil and 27-mil steel sheets; and (2) investigate the behavior of 6-ft. wide shear walls with multiple steel sheets. In objective 1: this research confirms the discrepancy existed in the published nominal strength of 27-mil sheets discovered by the previous project and verified the published nominal strength of 18 mil sheet for the wind design in AISI S213. The project also finds disagreement on the nominal strength of 18-mil sheets for seismic design, which is 29.0% higher than the published values. The research investigated 6-ft. wide shear wall with four framing and sheathing configurations. Configuration C, which used detailing, could provide the highest shear strength, compared to Configurations A and B. Meanwhile, the shear strength and stiffness of 2-ft. wide and 4-ft. wide wall can be improved by using the seismic detailing.
Date: August 2010
Creator: Chen, Yujie
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Organized Semantic Fluency and Executive Functioning in an Adult Clinical Sample and a Community Sample (open access)

Organized Semantic Fluency and Executive Functioning in an Adult Clinical Sample and a Community Sample

The study investigated an organized semantic fluency task, (the Controlled Animal Fluency Task - CAFT) as a measure of executive functioning (EF) in adults, and the relationship with instrumental activities of daily living (IADL). Participants (N = 266) consisted of a clinical sample (n = 142) utilizing neuropsychological assessment data collected at an outpatient psychological center, and a community sample (n = 124). The clinical sample was a heterogeneous mixed neurological group including a variety of health conditions and comorbid anxiety and depression. The CAFT Animals by Size demonstrated a significant positive correlation with Category Fluency (r = .71, n = 142, p < .001) , Animal Fluency (r = .70, n = 142, p < .001), and with other, established neuropsychological measures. The CAFT Animals by Size condition demonstrated a significant moderate negative correlation with IADL for the sample as a whole (r = -.46, n = 248, p < .001), and for the clinical sample (r = -.38, n = 129, p < .001), but not for the community sample. In a hierarchical regression analysis, CAFT Animal by Size explained additional variance in IADL (&#916;R2 = .15). In a hierarchical regression analysis predicting IADL with the control variables …
Date: August 2010
Creator: Chlipala, M. Linda
Object Type: Thesis or Dissertation
System: The UNT Digital Library