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Smoothing the information seeking path: Removing representational obstacles in the middle-school digital library. (open access)

Smoothing the information seeking path: Removing representational obstacles in the middle-school digital library.

Middle school student's interaction within a digital library is explored. Issues of interface features used, obstacles encountered, search strategies and search techniques used, and representation obstacles are examined. A mechanism for evaluating user's descriptors is tested and effects of augmenting the system's resource descriptions with these descriptors on retrieval is explored. Transaction log data analysis (TLA) was used, with external corroborating achievement data provided by teachers. Analysis was conducted using quantitative and qualitative methods. Coding schemes for the failure analysis, search strategies and techniques analysis, as well as extent of match analysis between terms in student's questions and their search terms, and extent of match analysis between search terms and controlled vocabulary were developed. There are five chapters with twelve supporting appendixes. Chapter One presents an introduction to the problem and reviews the pilot study. Chapter Two presents the literature review and theoretical basis for the study. Chapter Three describes the research questions, hypotheses and methods. Chapter Four presents findings. Chapter Five presents a summary of the findings and their support of the hypotheses. Unanticipated findings, limitations, speculations, and areas of further research are indicated. Findings indicate that middle school users interact with the system in various sequences of patterns. …
Date: May 2002
Creator: Abbas, June M.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Effect of Average Grain Size on Polycrystalline Diamond Films (open access)

The Effect of Average Grain Size on Polycrystalline Diamond Films

The work function of hydrogen-terminated, polycrystalline diamond was studied using ultraviolet photoelectron spectroscopy. Polycrystalline diamond films were deposited onto molybdenum substrates by electrophoresis for grain sizes ranging from 0.3 to 108 microns. The work function and electron affinity were measured using 21.2 eV photons from a helium plasma source. The films were characterized by x-ray photoelectron spectroscopy to determine elemental composition and the sp2/sp3 carbon fraction. The percentage of (111) diamond was determined by x-ray diffraction, and scanning electron microscopy was performed to determine average grain size. The measured work function has a maximum of 5.1 eV at 0.3 microns, and decreases to 3.2 eV at approximately 4 microns. Then the work function increases with increasing grain size to 4.0 eV at 15 microns and then asymptotically approaches the 4.8 eV work function of single crystal diamond at 108 microns. These results are consistent with a 3-component model in which the work function is controlled by single-crystal (111) diamond at larger grain sizes, graphitic carbon at smaller grain sizes, and by the electron affinity for the intervening grain sizes.
Date: May 2002
Creator: Abbott, Patrick Roland
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Landscape forest modeling of the Luquillo Experimental Forest, Puerto Rico. (open access)

Landscape forest modeling of the Luquillo Experimental Forest, Puerto Rico.

This thesis contributes to modeling the dynamics of forest community response to environmental gradients and disturbances over a mountain landscape. A gap model (FACET) was parameterized for species of various forest types (Tabonuco, Colorado, Dwarf and Palm), for many terrain conditions and was modified and extended to include species response to excess soil moisture and hurricanes. Landscape cover types were defined by dominance of species of each forest type and canopy height. Parameters of the landscape model (MOSAIC) were calculated from multiple runs of FACET. These runs were determined by combining terrain variables (elevation and soil) and hurricane risk. MOSAIC runs were analyzed for distribution patterns. Geographic Information Systems software was used to process terrain variables, hurricane risk and MOSAIC model output.
Date: December 2002
Creator: Abbott-Wood, Chris
Object Type: Thesis or Dissertation
System: The UNT Digital Library
A Study of the Relationship Between the Levels of Self-Awareness within Students Enrolled in Counseling Practicum and the Measurements of Their Counseling Effectiveness (open access)

A Study of the Relationship Between the Levels of Self-Awareness within Students Enrolled in Counseling Practicum and the Measurements of Their Counseling Effectiveness

Counselor self-awareness is considered an important aspect of counseling effectiveness according to the American Counseling Association and the American Psychological Association and in numerous studies and articles within the counseling literature. With the effort to improve the effectiveness of counseling practicum students comes the need to understand the relationship between effectiveness ratings and the levels of counselor self-awareness. Gestalt Therapy literature, and the development of the Personal Orientation Inventory (Shostrom, 1963) provided the working definition of self-awareness in this study. Research and evaluation are means for improving the correlation between students' characteristics in counselor training programs and their effectiveness as perceived by faculty and doctoral supervisors. The purpose of this study was to determine the effects of practicum students' ages and their levels of self-awareness upon counseling effectiveness as measured by faculty and doctoral supervisors in a university clinic setting. Twenty-nine students who were enrolled in four practicum classes were administered the Personal Orientation Instrument. Four faculty supervisors and eight doctoral supervisors were administered the Counselor Effectiveness Rating Scale (Myrick & Kelley, 1971). The instruments were administered in the tenth week of the counseling practicum semester. Analyses of the data revealed a statistically significant interaction between the older practicum students' …
Date: August 2002
Creator: Abney, Paul C.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Megadrought and Megadeath in 16th Century Mexico (open access)

Megadrought and Megadeath in 16th Century Mexico

The native population collapse in 16th century Mexico was a demographic catastrophe with one of the highest death rates in history. Recently developed tree-ring evidence has allowed the levels of precipitation to be reconstructed for north central Mexico, adding to the growing body of epidemiologic evidence and indicating that the 1545 and 1576 epidemics of cocoliztli (Nahuatl for "pest") were indigenous hemorrhagic fevers transmitted by rodent hosts and aggravated by extreme drought conditions.
Date: 2002
Creator: Acuna-Soto, Rodolfo; Stahle, David W.; Cleaveland, Malcolm K. & Therrell, Matthew D.
Object Type: Text
System: The UNT Digital Library
Transnational Organized Crime and the Drug Business (open access)

Transnational Organized Crime and the Drug Business

This study analyzes the activities of the organized crime groups involved in the drug business, as well as examining national and international efforts to control these groups. Specifically, this study addresses the following questions: How is organized crime connected to the international drug business?; What are the major transnational organized crime groups involved in the international drug business?; What is the nature of the drug problem as it relates to organized crime internationally?; What international cooperative law enforcement efforts currently exist to deal with organized crime and the drug business? Findings indicate that efforts to create an effective international law enforcement network are needed to meet the challenges of drug trafficking and globalized crime. To date, such efforts have largely been unsuccessful.
Date: August 2002
Creator: Aksakal, Baris
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Use of the Beck Depression Inventory in Northern Brazil (open access)

Use of the Beck Depression Inventory in Northern Brazil

The Beck Depression Inventory (BDI) is a popular screening and research instrument for measuring severity of depression. The instrument was translated to Portuguese for use in Brazil in 1979; however, it was not until recently that its psychometric properties have been tested empirically for the Brazilian population. The purpose of the present study was to explore the BDI's psychometric properties in a northern region of Brazil and to test for possible relationships between certain demographic variables and BDI outcomes. Samples used in this study were from an urban area in Roraima, the northernmost state of Brazil. The BDI showed adequate levels of internal consistency in nonclinical and clinical samples. Female respondents had significantly higher scores than male respondents. Those who had lower levels of education, income, or occupational status had significantly higher scores than those with higher levels of these variables. Adolescents had significantly higher scores than adults from all age groups except those from age 19 to 22. No significant difference was found between those who identified themselves as “indigenous” and those who identified themselves as “non-indigenous.” Regression analysis results showed that the combination of gender, education, and age best accounted for the variance in BDI scores. An ANCOVA …
Date: May 2002
Creator: Albert, Christopher
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Influence Of Jazz On Timbre In Selected Compositions For Solo Trombone (open access)

The Influence Of Jazz On Timbre In Selected Compositions For Solo Trombone

A significant body of solo literature for the trombone has been written in the last fifty years that draws as much from the jazz tradition as from that of European classical music. While much attention has been paid to these works' use of characteristic jazz rhythms, harmonies and melodic inflections, there has been little focus on timbre, the musical element that perhaps most readily distinguishes jazz from other styles of Western music. This paper focuses on the important role jazz timbres should play in a performer's interpretation of those works that are significantly influenced by jazz. It includes explorations of the significant differences in concepts of timbre between European classical music and jazz, some of the ways in which these timbral differences are produced, and methods by which performers can develop the skills necessary to produce these varied timbres. Particular attention is paid to the importance of timbre to idiomatically appropriate performances of two significant works from the solo trombone repertoire, Robert Suderburg's Night Set (Chamber Music III) and Richard Peaslee's Arrows of Time.
Date: December 2002
Creator: Aldag, Daniel J.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Meeting the Digital Resource Preservation Challenges: The University of North Texas Libraries Initiative

This presentation describes the University of North Texas Libraries' initiatives to ensure long-term access to various digital resources.
Date: 2002
Creator: Alemneh, Daniel Gelaw & Hartman, Cathy Nelson
Object Type: Presentation
System: The UNT Digital Library
A Metadata Approach to Preservation of Digital Resources: The University of North Texas Libraries' Experience (open access)

A Metadata Approach to Preservation of Digital Resources: The University of North Texas Libraries' Experience

Article discussing metadata approaches to preservation of digital resources and the experiences of the University of North Texas (UNT) Libraries.
Date: August 5, 2002
Creator: Alemneh, Daniel Gelaw; Hastings, Samantha Kelly & Hartman, Cathy Nelson
Object Type: Article
System: The UNT Digital Library
Gathering Customer Input Prior to Home Page Redesign: An Ontological Study (open access)

Gathering Customer Input Prior to Home Page Redesign: An Ontological Study

Document accompanying a poster presentation on an ontological study of customer input prior to a home page redesign.
Date: 2002
Creator: Alexander, Katherine; Harker, Karen; Higa-Moore, Mori Lou; Mayo, Helen; McKibbon, Shelley & Wilder, Laura
Object Type: Paper
System: The UNT Digital Library

Gathering Customer Input Prior to Home Page Redesign: An Ontological Study [Poster]

Poster presented at the 2002 AMIA Annual Symposium. This poster discusses an ontological study on gathering input prior to home page redesign.
Date: 2002
Creator: Alexander, Katherine; Harker, Karen; Higa-Moore, Mori Lou; Mayo, Helen; McKibbon, Shelley & Wilder, Laura
Object Type: Poster
System: The UNT Digital Library

Development, Validation, and Evaluation of a Continuous, Real-time, Bivalve Biomonitoring System

Access: Use of this item is restricted to the UNT Community
A biological monitoring tool to assess water quality using bivalve gape behavior was developed and demonstrated. The purpose of this work was to develop methodologies for screening water quality appropriate to the goals of the watershed paradigm. A model of bivalve gape behavior based on prediction of behavior using autoregressive techniques was the foundation of the bivalve biomonitoring system. Current technology was used in developing the system to provide bivalve gape state data in a continuous real-time manner. A laboratory version of the system, including data collection and analysis hardware and software, was developed for use as a toxicological assay for determination of effective concentrations of toxicant(s) or other types of stress on bivalve gape behavior. Corbicula fluminea was monitored and challenged with copper, zinc, and chlorpyrifos using the system. Effective concentrations of 176±23µg/L copper, 768±412µg/L zinc, and 68µg/L chlorpyrifos were observed using a natural water with high dissolved organic carbon concentrations. A rugged field version of the bivalve biomonitoring system was developed and deployed in two locations. The field systems were fitted with a photovoltaic array, a single board computer, and a CDPD telemetry modem for robust remote operation. Data were telemetered at a time relevant rate of once …
Date: December 2002
Creator: Allen, H. Joel
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Highways of a Global Traveler: Tracking Tropospheric Ozone (open access)

Highways of a Global Traveler: Tracking Tropospheric Ozone

On the stage of global change, ozone plays the role of both hero and villain. This brief document discusses about the tracking of Tropospheric Ozone, where ozone forms and where it travels have become key concerns for international health and economic policy-making.
Date: March 22, 2002
Creator: Allen, Jeannie & Simmon, Robert
Object Type: Text
System: The UNT Digital Library
The Hexagon, Volume 93, Number 1, Spring 2002 (open access)

The Hexagon, Volume 93, Number 1, Spring 2002

Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date: Spring 2002
Creator: Alpha Chi Sigma
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library
The Hexagon, Volume 93, Number 2, Summer 2002 (open access)

The Hexagon, Volume 93, Number 2, Summer 2002

Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date: Summer 2002
Creator: Alpha Chi Sigma
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library
The Hexagon, Volume 93, Number 3, Fall 2002 (open access)

The Hexagon, Volume 93, Number 3, Fall 2002

Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date: Autumn 2002
Creator: Alpha Chi Sigma
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library
The Hexagon, Volume 93, Number 4, Winter 2002 (open access)

The Hexagon, Volume 93, Number 4, Winter 2002

Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups. This special issue includes information about the annual conclave, held in Madison, Wisconsin.
Date: Winter 2002
Creator: Alpha Chi Sigma
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library
Southwest Retort, Volume 54, Number 5, January 2002 (open access)

Southwest Retort, Volume 54, Number 5, January 2002

This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date: January 2002
Creator: American Chemical Society. Dallas/Fort Worth Section.
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library
Southwest Retort, Volume 54, Number 6, February 2002 (open access)

Southwest Retort, Volume 54, Number 6, February 2002

This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date: February 2002
Creator: American Chemical Society. Dallas/Fort Worth Section.
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library
Southwest Retort, Volume 54, Number 7, March 2002 (open access)

Southwest Retort, Volume 54, Number 7, March 2002

This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date: March 2002
Creator: American Chemical Society. Dallas/Fort Worth Section.
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library
Southwest Retort, Volume 54, Number 8, April 2002 (open access)

Southwest Retort, Volume 54, Number 8, April 2002

This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date: April 2002
Creator: American Chemical Society. Dallas/Fort Worth Section.
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library
Southwest Retort, Volume 54, Number 9, May/June 2002 (open access)

Southwest Retort, Volume 54, Number 9, May/June 2002

This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date: June 2002
Creator: American Chemical Society. Dallas/Fort Worth Section.
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library
Southwest Retort, Volume 55, Number 1, September 2002 (open access)

Southwest Retort, Volume 55, Number 1, September 2002

This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date: September 2002
Creator: American Chemical Society. Dallas/Fort Worth Section.
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library