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Exceedance Frequency Analysis of Urban Stormwater Quality and Its Relation to Land Use Change, Denton, Texas

Description: Urbanization causes various environmental issues including water pollution, air pollution, and solid waste. Urbanization of watersheds has a profound influence on the quality of stormwater runoff. The quality of stormwater runoff is highly associated with land use. This study analyzed the exceedance frequency of stormwater quality in five watersheds of Denton over eleven years and also analyzed the relationship between stormwater quality and land use/cover of each watershed. The results showed that the most of the water quality parameters that were examined in the Lower Pecan watershed exceeded their threshold most frequently. The higher frequency of exceedance in this watershed can be attributed to the wastewater treatment plant and landfill site. Total suspended solids and turbidity were frequently exceeded in Hickory and Clear Creek watersheds. Conductivity was found to have highest percentage of exceedance in Upper Pecan and Cooper watersheds. Thus, rural watersheds were related with higher exceedance of TSS and turbidity whereas urban watersheds were related with higher exceedance of conductivity.
Date: August 2015
Creator: Shrestha, Manjul
Partner: UNT Libraries

Evaluation of the Influence of Non-Conventional Sources of Emissions on Ambient Air Pollutant Concentrations in North Texas

Description: Emissions of air pollutants from non-conventional sources have been on the rise in the North Texas area over the past decade. These include primary pollutants such as volatile organic compound (VOC) and oxides of nitrogen (NOx) which also act as precursors in the formation of ozone. Most of these have been attributed to a significant increase in oil and gas production activities since 2000 within the Barnett Shale region adjacent to the Dallas-Fort Worth metroplex region. In this study, air quality concentrations measured at the Denton Airport and Dallas Hinton monitoring sites operated by the Texas Commission on Environmental Quality (TCEQ) were evaluated. VOC concentration data from canister-based sampling along with continuous measurement of oxides of nitrogen (NOx), ozone (O3), particulate matter (PM2.5), and meteorological conditions at these two sites spanning from 2000 through 2014 were employed in this study. The Dallas site is located within the urban core of one of the fastest growing cities in the United States, while the Denton site is an exurban site with rural characteristics to it. The Denton Airport site was influenced by natural gas pads surrounding it while there are very few natural gas production facilities within close proximity to the Dallas Hinton site. As of 2013, there were 1362 gas pads within a 10 mile radius to the Denton Airport site but there were only 2 within a 10 mile radius to Dallas Hinton site. The Dallas site displayed higher concentrations of NOx and much lower concentrations of VOC than the Denton site. Extremely high levels of VOC measured at the Denton site corresponded with the increase in oil and gas production activities in close proximity to the monitoring site. Ethane and propane are two major contributors to the measured VOC concentration, suggesting the influence of fugitive emissions of natural gas. ...
Date: August 2015
Creator: Lim, Guo Quan
Partner: UNT Libraries

Health-related Quality of Life and Social Engagement in Assisted Living Facilities

Description: This research project aims to clarify the factors that impact successful aging in Assisted Living facilities (ALFs) in Denton County, Texas. We hypothesize that social disengagement decreases physical and mental components of quality of life. This exploratory research project employed standardized questionnaires to assess residents in the following domains; HRQOL, social engagement status, level of cognition, depression, and the level of functioning. This study collected data from 75 participants living in five ALFs. The average of Physical Component Scale (PCS) and Mental Component Scale (MCS) was 35.33, and 53.62 respectively. None of the participants had five or more social contacts out of facilities, and two-third of them had two or less social contacts. On average, those participants who were more socially engaged had higher score of MCS compared with disengaged counterparts. The level of physical function significantly affects social engagement, when people with more disabilities are more likely to be socially disengaged. Social engagement and depression significantly impact MCS, when depression is a mediating factor between social engagement and mental component of quality of life. Considering the expansion in aging population in the United States within the next three decades, the demand for high quality long-term care will skyrocket consequently. This study reveals that external social engagement can sustain HRQOL of residents in assisted living facilities.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: August 2015
Creator: Amini, Reza
Partner: UNT Libraries

Efficiency of Nitrate and Phosphorus Removal in a Working Rain Garden

Description: Rain gardens are low impact developments designed to mitigate a suite of issues associated with urban stormwater runoff. The site for this study was a Denton City rain garden at the Denton Waste Water Treatment Plant. Nitrogen and phosphorus removal was examined in light of two overflow events comprised of partially treated wastewater from an upslope anaerobic digester pond. Nitrate removal efficiency was examined across differing dry spell intervals of 5, 8, and 12 d, displaying a moderate negative correlation (r2 = 0.59). Continued phosphorus removal capacity was assessed, showing phosphorus removal in cases where P was in excess of 0.8 mg/L, reflecting an equilibrium phosphorus concentration. A high expanded shale component in the soil media (25%) was likely a factor in the continued removal of phosphorus. Overall the rain garden proved to be a large source of nitrate (+425%) and total nitrogen (+61%) by mass. The study showed that while the rain garden intercepted a large volume of partially treated wastewater during the overflow events, preventing it from reaching a nearby creek, the mitigation of an acute event has extended to a chronic one as nitrogen is gradually processed and flushed from the system as nitrate.
Date: August 2015
Creator: Strong, Patrick
Partner: UNT Libraries

Impact of Green Design and Technology on Building Environment

Description: Currently, the public has a strong sense of the need for environment protection and the use of sustainable, or “green,” design in buildings and other civil structures. Since green design elements and technologies are different from traditional design, they probably have impacts on the building environment, such as vibration, lighting, noise, temperature, relative humidity, and overall comfort. Determining these impacts of green design on building environments is the primary objective of this study. The Zero Energy Research (ZOE) laboratory, located at the University of North Texas Discovery Park, is analyzed as a case study. Because the ZOE lab is a building that combines various green design elements and energy efficient technologies, such as solar panels, a geothermal heating system, and wind turbines, it provides an ideal case to study. Through field measurements and a questionnaire survey of regular occupants of the ZOE lab, this thesis analyzed and reported: 1) whether green design elements changed the building’s ability to meet common building environmental standards, 2) whether green design elements assisted in Leadership in Energy and Environmental Design (LEED) scoring, and 3) whether green design elements decreased the subjective comfort level of the occupants.
Date: December 2015
Creator: Xiong, Liang
Partner: UNT Libraries

Assessing the Spatial and Temporal Distribution of MTBE and BTEX Compounds in Lake Lewisville, Texas February 1999 - February 2000

Description: The spatial and temporal distribution of Methyl Tertiary-Butyl Ether (MTBE) and BTEX (Benzene, Toluene, Ethylbenzene, Xylenes) compounds were assessed in a multipurpose reservoir, Lake Lewisville, Texas between February 1999 and February 2000. Concentrations of MTBE ranged from 0.0 - 16.7 mg/L. Levels of MTBE in the lake were related to watercraft. BTEX concentrations were never detected above 2.0 mg/L during the sampling period. Finished drinking water from Denton and the Upper Trinity Regional Water District (UTRWD) Treatment Plants were also tested for MTBE and BTEX. MTBE and BTEX were not detected in UTRWD water samples. Denton's finished water samples never exceeded 2.2 mg/L for MTBE and BTEX was not detected except for one replicate of 1.1 mg/L toluene.
Date: August 2000
Creator: Lee, Anne W.
Partner: UNT Libraries

Characterizing the Municipal Solid Waste Stream in Denton, Texas

Description: Forty-two commercially collected dumpsters from Denton’s Municipal Solid Waste Stream were emptied, sorted and weighed to characterize the material types and make preliminary recycling policy recommendations. The general composition of Denton’s solid waste stream was not significantly different from the composition of the nation’s solid waste stream. Fifty-eight percent of the observed waste stream was recyclable. Paper made up the largest portion of recyclable materials and the "grocery" source category had more paper than any of the other five categories. Based on these findings, an incrementally aggressive approach is recommended to reduce certain types of wastes observed in the waste stream. This would include a Pay-As-You-Throw Program followed by an Intermediate Processing Center that can be converted to a Materials Recovery Facility.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: August 2000
Creator: Brady, Patricia D.
Partner: UNT Libraries

An Assessment of the Use of Seeding, Mowing, and Burning in the Restoration of an Oldfield to Tallgrass Prairie in Lewisville, Texas

Description: An examination of the effectiveness of seeding, burning, and mowing in the reestablishment of tallgrass prairie species on overgrazed and abandoned pastureland. The study site is a 20 acre tract on U.S. Corps of Engineers land below Lake Lewisville in Denton County, Texas. The site was partitioned into thirty-nine 40 by 40 meter plots with seeding (carried out in 1996) and management treatment (burning, mowing, and no maintenance carried out in 1998) randomly applied following a two level design. For each plot, nine stratified-random 0.1 m2 subplots were examined and shoot counts for each species recorded. The effects of the treatments on individual species and species richness were analyzed with a two-way ANOVA followed by a SNK multiple range test, both on ranked data. Community level analysis was conducted with both a MANOVA on ranked data and a Canonical Correspondence Analysis on raw data. Results indicate that seeding positively affected species richness, particularly when combined with either burning or mowing in the early spring. Mowing also significantly increased species richness in areas that were not seeded, while burning negatively affected species richness on unseeded plots. Treatments significantly affected community composition with treatments having the most clear effect on spring and summer forbs.
Date: August 1999
Creator: Windhager, Steven
Partner: UNT Libraries

“Removing the Danger in a Business Way”: the History and Memory of Quakertown, Denton, Texas

Description: Overall this thesis analyzes a strain of the white supremacist vision in Denton, Texas via a case study of a former middle-class black neighborhood. This former community, Quakertown, was removed by white city officials and leaders in the early 1920s and was replaced with a public city park. Nearly a century later, the story of Quakertown is celebrated in Denton and is remembered through many sites of memory such as a museum, various texts, and several city, county, and state historical markers. Both the history and memory of Quakertown reveal levels of dominating white supremacy in Denton, ranging from harmless to violent. Chapters 2, 3, and 4 focus on the history of Quakertown. I begin chapter 2 by examining as many details as possible that reveal the middle-class nature of the black community and its residents. Several of these details show that Quakertown residents not only possessed plentiful material items, but they also had high levels of societal involvement both within their community as well as around Denton. Despite being a self-sufficient and successful community, Quakertown residents were not immune to the culture of racial fear that existed in Denton, which was common to countless towns and communities across the South during the Jim Crow era. I identify several factors that contributed to this culture of fear on the national level and explore how they were regularly consumed by Denton citizens in the 1910s and 1920s. After establishing Quakertown and the racist society in which it thrived, in chapter 3 I then examine the various sects of what I term the “white coalition,” such as local politicians, prominent citizens, and city clubs and organizations, who came together to construct a reason to remove the black community out of fear because of its proximity to the white women’s college, the College ...
Date: August 2015
Creator: Stallings, Chelsea
Partner: UNT Libraries

An Experimental Study of Critial Thinking in Student-Centered Teaching

Description: The problem of this study was to determine the effectiveness of student-centered teaching in producing significant changes in certain critical thinking abilities among selected freshmen students at North Texas State College.
Date: June 1961
Creator: Graham, Daniel W.
Partner: UNT Libraries

A Field Follow-Up Study of Beginning Elementary Teachers

Description: The present study was made to determine the relationship between the level of teaching effectiveness of beginning elementary teachers and three individual characteristics of prospective teachers. A secondary purpose was an attempt to improve the service rendered by the School of Education at North Texas State College, Denton, Texas, in the selection and guidance of students who indicate a desire to enter the program for preparing elementary teachers.
Date: June 1961
Creator: Tate, James Oliver, 1929-
Partner: UNT Libraries

Predicting Achievement in a Graduate School of Education

Description: The purpose of this study was to determine the relationships between selected criteria and academic achievement in graduate studies leading to certain master's degrees in education at North Texas State University. The major areas in education which were included were Elementary Education, Elementary School Administration and Supervision, Secondary Education, Secondary School Administration and Supervision, and Physical Education. Graduate grade-point average was used as the criterion for academic achievement.
Date: June 1963
Creator: Hughes, Billie Edward, 1927-
Partner: UNT Libraries

Personal Characteristics in Secondary School Social Studies Student Teachers as Related to Certain Measures of Potential Teaching Behavior

Description: The purpose of this study was to search for relationships of certain personal characteristics (authoritarianism, philosophy of social education, and instructional preferences) of a representative group of social studies student teachers to measures respectively of a) their classroom behavioral traits, b) their classroom teaching activities, and c) their pupils' classroom behavior.
Date: August 1963
Creator: Liu, Shia-Ling, 1922-
Partner: UNT Libraries

Relationship between Aptitudes and Major Fields of Study

Description: As new measures of aptitude are devised, their implications to education are a fertile source for research. All facets of aptitudes as they relate to education are explored. This study is concerned with such exploration in that it investigates the relationships between aptitudes, as measured by the General Aptitude Test Battery and selected major fields of study at North Texas State College, Denton, Texas. The major fields of study selected for this research are Accounting, Business Education, Elementary Education, Industrial Arts and Marketing.
Date: January 1957
Creator: Nicksick, Theodore
Partner: UNT Libraries

An Analytical and Descriptive Technique for Rating Student Teachers

Description: The problem of this study was to develop an analytical and descriptive technique for rating the performances of student teachers. In order to arrive at a solution to this problem, the following sub-problems were to be solved; namely, 1. To develop and validate a set of criteria for describing and rating the performances of student teachers; 2. To develop and validate a descriptive rating scale utilizing those criteria; 3. To develop a technique for using this descriptive rating scale; 4. To establish reliability of the instrument and to demonstrate the ability of the instrument to perform its intended functions.
Date: June 1957
Creator: Latham, James L.
Partner: UNT Libraries

The Relationship between Dominative-Integrative Classroom Behavior and Selected Measures of Socio-Civic Attitudes of Students Preparing to Teach the Social Studies

Description: The purpose of this study was to make as analysis of the relationship between dominative-integrative classroom behavior and the mean scores on selected measures of socio-civic attitudes of students at North Texas State College preparing to teach the social studies during the year 1960-61.
Date: August 1961
Creator: Nicholson, Virgil Marion
Partner: UNT Libraries

A Comparative Evaluation of the Effectiveness of Group Guidance and Individual Counseling with Freshmen

Description: The primary objective was to investigate the effectiveness of short-term group guidance and short-term individual counseling with freshman college students. The design utilizes the method and procedure of comparing similar groups of students who received group guidance, students who received individual counseling, and students who received no counseling or guidance. A comparison of the ratio between self-ratings and objectively evaluated test scores before and after the study served as the basis for determining the effectiveness of the experimental variables.
Date: January 1962
Creator: Kemp, George Allen
Partner: UNT Libraries

An Evaluation of Closed-Circuit Television Observation for Students Taking Certain Courses in Elementary Education

Description: The problem of this study was to determine if significant differences in scores attained by students on academic achievement, problem-solving, and attitudes were associated with closed-circuit television observations. More specifically, the problem was resolved into seeking solutions to the following! 1. Will college students' academic achievement be extended through television observations of children in classroom situations? 2. Will college students' ability to solve problems be improved through television observations? 3. Will college students' attitudes toward teacher-pupil relationships be affected through television observations?
Date: August 1962
Creator: DeViney, Robert Dawson, 1915-
Partner: UNT Libraries

Effectiveness of Short-Term Group Guidance with a Group of Transfer Students Admitted on Academic Probation

Description: The problem of this study was to determine the effectiveness of short-term group guidance in improving the academic achievement of transfer students admitted to North Texas State University on scholastic probation. In addition to the primary problem, an analysis was made of the differences in changes in certain psychological needs, as measured by the Edwards Personal Preference Schedule, between academically successful and unsuccessful students. Changes in these psychological needs were determined for students who participated in group guidance sessions and compared with changes made by a group of students who did not participate in group guidance. The relationship between these need changes and grade-point average was studied for these students. A comparison of the number of drop-outs was made between students who participated in group guidance sessions and students who did not participate.
Date: August 1962
Creator: Maroney, Kenneth Austin
Partner: UNT Libraries

The Effectiveness of Two Techniques of Counseling with Students on Academic Probation

Description: The problem of this study was to analyze the effectiveness of two counseling procedures which were used with college students on academic probation. The functions of the problem were: 1. To determine whether there were any differences on selected variables among three groups of college students on academic probation who participated in individual counseling, in group guidance, or were given no formal counseling. 2. To determine the degree to which the relative effectiveness of group guidance, individual counseling, and no counseling was related to the scholastic aptitude of the students.
Date: August 1962
Creator: Speegle, Philip Tenney, 1938-
Partner: UNT Libraries

Factors Associated with Success in the Doctor of Education Program at North Texas State University

Description: The purpose of this study was to determine the significance of certain factors relating to successful completion of the program by students in the Doctor of Education program at North Texas State University. Specifically, these factors were determined by a screening of judgments of North Texas State University graduates who had successfully completed the program, students engaged in the program, and from analysis of the factors derived from student records and research in related studies.
Date: January 1963
Creator: Gleason, Dale H.
Partner: UNT Libraries

An Analysis and Classificiation of Children's Explanations of Natural Phenomena

Description: The problem of this study was to analyze the answers given by four groups (grade levels) of elementary school children and one group of adults (college freshmen) to direct questions regarding natural phenomena, to classify their explanations, to determine the methods and types of explanations used by these groups when they explain typical natural phenomena, and to compare these findings with the results of other investigators, especially Jean Piaget and Mervin E. Oakes.
Date: January 1963
Creator: Smith, Robert Frank
Partner: UNT Libraries