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Field Validation of Zero Energy Lab Water-to-Water Ground Coupled Heat Pump Model
Heat pumps are a vital part of each building for their role in keeping the space conditioned for the occupant. This study focuses on developing a model for the ground-source heat pump at the Zero Energy lab at the University of North Texas, and finding the minimum data required for generating the model. The literature includes many models with different approaches to determine the performance of the heat pump. Each method has its pros and cons. In this research the equation-fit method was used to generate a model based on the data collected from the field. Two experiments were conducted for the cooling mode: the first one at the beginning of the season and the second one at the peak of the season to cover all the operation conditions. The same procedure was followed for the heating mode. The models generated based on the collected data were validated against the experiment data. The error of the models was within ±10%. The study showed that the error could be reduced by 20% to 42% when using the field data to generate the model instead of the manufacturer’s catalog data. Also it was found that the minimum period to generate the cooling …
Date:
May 2016
Creator:
Abdulameer, Saif
System:
The UNT Digital Library
The Effects of Music and Operant Conditioning on Gross Motor Activity of Profound Mental Retardates
It has not yet been demonstrated that music can be used therapeutically with profoundly retarded children. One way these children might be helped to respond to music, and therapeutically benefit from it, would be to use operant conditioning in an effort to enhance gross motor activity and then progressively shape responses until more complex behavior patterns are formed. Once these children can respond motorically in the presence of musical stimuli, continuation of responding may be possible by pairing motor activity with musical stimuli. This experiment investigated the effects of operant conditioning and music on the motor activity of profoundly retarded children in an effort to determine the therapeutic usefulness of music with such children.
Date:
January 1968
Creator:
Addison, Max R.
System:
The UNT Digital Library
A Study of Academic, Personal, Social and Financial Satisfactions of International Students at North Texas State University
The problem of this study was to determine the academic, personal, social, and financial level of satisfaction of the international students at North Texas State University. The subjects were 351 international students representing fifty-four different countries. These students were enrolled full time during the fall semester of 1981. The instrument used to gather the data was a questionnaire. The questionnaire was validated by a panel of experts and pretested on a small sample of international students.
Date:
May 1983
Creator:
Ahmadian, Ahmad
System:
The UNT Digital Library
Satisfaction with College Among Selected Groups of International Students
The purpose of this study was twofold. The first purpose was to identify and determine the degree of satisfaction experienced by selected groups of international students at North Texas State University in Denton, Texas. The second purpose was to analyze and interpret the data collected in relation to selected demographic variables. The following hypotheses were devised to guide the interpretation of the data findings. 1. There will be a significant difference in the degree of satisfaction with university administration among the three selected groups of N.T.S.U. international students. 2. There will be a significant difference in the degree of satisfaction with university faculty among the three selected groups of N.T.S.U. international students. 3. There will be a significant difference in the degree of satisfaction with fellow students among the three selected groups of N.T.S.U. international students.
Date:
December 1984
Creator:
Ahmed, Marwa Kamel
System:
The UNT Digital Library
The Use of Selected Aptitude Test Scores for Predicting Achievement in Modern Foreign Languages at North Texas State University
The problem of this study was to determine the value of certain selected aptitude test scores for predicting student achievement in Spanish, French, and German at North Texas State University. Particular emphasis was placed on freshmen enrolled in beginning courses.
Date:
August 1971
Creator:
Akins, Dolores C.
System:
The UNT Digital Library
Degradation of Phenolic Acids by Azotobacter Species Isolated from Sorghum Fields
Sorghum plants excrete phenolic acids which reduce subsequent crop yields. These acids accumulate in field soil by combining with soil and clay particles to form stable complexes which remain until degraded by bacterial metabolism. The amount of phenolic acids in soil samples were obtained by gas chromatography measurements, while Azotobacter populations were obtained by plate counts in 40 sorghum field samples from Denton County, Texas. One can conclude that increasing the Azotobacter population in the soil increased the degradation rate of phenolic acids proportionally. It is proposed that seed inoculation will introduce selected strains of Azotobacter into the soil. The presence of Azotobacter should increase crop size in subsequent plantings.
Date:
August 1989
Creator:
Al-Hadhrami, Mohamed N. (Mohamed Nasser)
System:
The UNT Digital Library
Fear of Failure and Fear of Success: The Relationship of Achievement Motives to the Motor Performance of Males and Females
The study was designed to determine the relationship between the psychological constructs of "fear of failure (FOF)" and "fear of success (FOS)" and motor performance in badminton. Forty-three males and fifty-one females in beginning badminton classes were administered the FOF and FOS scales, followed by three independent skills tests and a round-robin singles tournament. Conclusions were that FOF and FOS are two separate performance motives; FOF appears to be the dominant motive for females; both FOF and FOS are related to motor performance in face-to-face competition, while only FOS is related to performance in isolated skills.
Date:
December 1982
Creator:
Albury, Kevin W.
System:
The UNT Digital Library
Differences in Personality Characteristics among Two Groups of Art Majors Varying in Creativity and a Control Group
The present study is somewhat exploratory in nature in that it is interested in determining some of the factors which correlate with creativity. The study will limit itself to investigating the factors measured by Cattell's Sixteen Personality Factor Questionnaire as they relate to creativity among high and low Creative art majors and non-art majors. To this end, it is hypothesized that a difference will be found among the mean scores of the three groups for at least thirteen of the sixteen factors.
Date:
August 1963
Creator:
Allred, Raymond Coye, 1930-
System:
The UNT Digital Library
The Implementation of Transition from Spanish Reading to English Reading Programs in Bilingual Classrooms
The purpose of this study was to describe the actual implementation of the transition process as observed in bilingual classrooms, and in particular, to examine the critical components (policy, curricular, and instructional characteristics) of the Spanish-to-English reading transition policies implemented in bilingual education programs in elementary schools in the Denton Independent School District in Texas. Four research questions drove this study. To investigate these questions, a multidimensional, descriptive research design was employed. The researcher used questionnaires, interviews, and field observations. The 11 educators, 6 bilingual teachers, 2 school-site principals, 2 school-site coordinators, and 1 district bilingual coordinator, were asked several types of questions (open response and closed response) using different types of instruments (questionnaires and interviews). Also, the six bilingual teachers were observed using two types of instruments (field notes and video tapes).
Date:
December 1994
Creator:
Amaya, Jesús, 1956-
System:
The UNT Digital Library
Health-related Quality of Life and Social Engagement in Assisted Living Facilities
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. …
Date:
August 2015
Creator:
Amini, Reza
System:
The UNT Digital Library
A Study of Dominance-Feeling in College Women
The purposes of this study are as follows: 1. To measure, compare, and evaluate the level of self-esteem of college women in two colleges. 2. To show the relationship of certain background factors to dominance-feeling in college women.
Date:
1946
Creator:
Anderson, Dan L.
System:
The UNT Digital Library
HIV-Associated Dementia: Cofactors as Predictors of Severity of Neurocoenitive Deficits
The objective of the present study was to evaluate the relationship between a set of cofactors and severity of cognitive impairment, to determine if there were any factors which significantly predicted more severe neurocognitive deficits in persons with AIDS. Twenty-four male volunteers recruited from community groups and physician referrals participated. Subjects completed several self-report questionnaires eliciting information regarding demographics and risk factor variables, in addition to a comprehensive battery of neuropsychological tests. A severity of cognitive impairment summary score was computed for each subject, reflecting both the number of impaired tests and their distance in the impaired direction from normative data. Neither CD4 count, number of months since diagnosis of AIDS, number of AIDS-related illnesses, number of recent stressors, history of head injury/LOC, history of substance use, current or past psychiatric disorder, history of learning disability nor history of other medical illness were found to be significantly related to severity of cognitive impairment in this sample, after controlling for the effects of age, level of education, estimated premorbid IQ and mood status. However, no reliable conclusions could be drawn from this study because the small sample size resulted in an unacceptably low level of statistical power for the desired regression …
Date:
December 1996
Creator:
Anderson, Deborah E. (Deborah Elaine), 1967-
System:
The UNT Digital Library
An Analysis of the Activity Program Offered at El Centro, Denton's Youth Center
"The problem of this thesis is to determine through survey and comparative study the effect of the activity program of Denton's El Centro, the youth center, on the youth of the City of Denton...methods of operation and internal organization of youth centers, the purpose of the centers and the results of some of the activities are outlined. Members of the Denton youth center were interviewed; the information gained from the interviews was recorded on prepared questionnaires. Various types of activities at Denton's youth center are discussed. The study also attempts to reveal by means of tables those activities which are more important to the male youth of Denton. A discussion of the treatment of the youth problem is given with conclusions based upon the principles and practices set forth in the foregoing chapters."-- leaf 2.
Date:
August 1949
Creator:
Anderson, Douglas Stevens
System:
The UNT Digital Library
The Development and Growth of Sports Activities for Women in North Texas State Teachers College from 1908 to 1938
"The problem of this study is to determine the growth of sports activities for women in the North Texas State Teachers College, Denton, Texas from 1908 to 1938"--1.
Date:
August 1939
Creator:
Anderson, Julia Mae
System:
The UNT Digital Library
A Study of Denton's Shopping Goods Trade Losses to Dallas and Fort Worth
"The primary objective of this study was to determine the proportion of shopping goods trade Denton merchants are losing to other cities. A secondary objective was to find reasons for the loss of trade. Since Denton is within the trade orbit of Dallas and Fort Worth, special emphasis was placed on finding the percentage of trade going to these two cities...The major finding of this study is the indication that approximately 81 percent of Denton's retail shopping goods trade is actually done in Denton. "-- leaves 1,58.
Date:
August 1953
Creator:
Anderson, Roy C.
System:
The UNT Digital Library
Changes in Attitudes, Personality, and Effectiveness of Counselor Trainees in Counseling Practicums
The purpose of this study was to compare three different approaches to the counselor practicum—-or campus practicum, an off-campus practicum, and a role-playing practicum—-with regard to the changes in attitudes, personality, and effectiveness of counseling behavior of counselor trainees produced by each type of practicum.
Date:
August 1968
Creator:
Anderson, Sharon Jane
System:
The UNT Digital Library
Differences in Social Behavior Between Elementary School Children Who Have Attended Nursery School and Those Who Have Not Attended Nursery School
The purpose of this study is to attempt to discover any observable differences in social behavior between elementary school pupils who have attended nursery school and those who have had no nursery school experience.
Date:
August 1954
Creator:
Angell, Dorothy B.
System:
The UNT Digital Library
Factors Influencing Freshmen Students' College Choice at the University of North Texas: a Focus Group Study
This study focused on factors that may influence freshmen students when choosing their colleges, specifically those who attend metropolitan universities such as the University of North Texas. In addition to identifying major characteristics of the institution that attract students, it also explored the sources of information that students considered important when making their choice about where to attend college. The primary instrument for gathering the data was focus groups. These informal, small groups provided a format for in-depth discussion and probing questioning about the needs, wants and influential factors driving freshmen college choice. Ten focus groups were held with between six and ten students in a specially designed room on the campus of the University of North Texas. A professional moderator was employed and sessions were observed via a two-way mirror and tape recorded for later transcription. The major questions addressed in the focus groups included: What factors influenced students the most to attend the University of North Texas? What did they consider the level of friendliness on campus? And how did the marketing materials that the university distributed impact their decision to attend? The study found that the factors that most influenced freshmen to attend the University of North …
Date:
August 1997
Creator:
Armstrong, Jami J. (Jami Joi)
System:
The UNT Digital Library
Behavior Rehearsal Combined with Anxiety Relief Conditioning : A New Assertion Training Paradigm and Its Relative Efficacy
An experiment was conducted to investigate the relative effectiveness of a combined behavior rehearsal anxiety relief conditioning paradigm with a more conventional behavioral rehearsal program in the treatment of deficient assertive behavior.
Date:
May 1973
Creator:
Arnold, Bill R.
System:
The UNT Digital Library
Food, Feeding Selectivity, and Ecological Efficiencies of Fundulus notatus (Rafinesque) (Osteichthyes; Cyprinodontidae)
This study was made to further define the trophic dynamics of Fundulus notatus by determining its ration composition under natural conditions, measuring feeding selectivity under various laboratory conditions of prey-species composition and availability, and determining the efficiencies with which F. notatus utilizes ingested chironomid larvae.
Date:
August 1970
Creator:
Atmar, Gerald Legare
System:
The UNT Digital Library
Manufacturer [Sic] of Densified-Refuse Derived Fuel (d-RDF) Pellets and Methods for the Determination of d-RDF Pellet Densities
There are 150 million tons of Municipal Solid Waste (MSW) annually produced in the United States, which is approximately equivalent to 150 million barrels of oil. MSW production is inexhaustible, and is increasing on an annual per capita basis of approximately three per cent. After controlling the moisture and adding a binder, the combustible portion of MSW was converted to pellets. The objects of this project were to 1) evaluate the binder, 2) prepare the pellets, and 3) evaluate the pellets with regard to density. The manufacture of pellets was conducted at the Naval Air Station, Jacksonville, Florida. The evaluation of the binders and the pellets was done at North Texas State University (NTSU). There were three procedures for measuring the density. The first, using water displacement, was from the American Society for Testing and Material (ASTM). The second, using wax coating, was also from ASTM. The third, using sharply-cut cylindrical pellets, was developed at NTSU.
Date:
December 1986
Creator:
Attili, Bassam Saleem
System:
The UNT Digital Library
Study of Some Factors Related to Mutual Friendship on the High School Level
This study has been made for the purpose of determining the similarities and dissimilarities in certain factors related to mutual friendships.
Date:
1945
Creator:
Averitt, Lois Jane
System:
The UNT Digital Library
The Establishment of Norms for Two Selected Tennis Skills Tests at North Texas State University
The purposes of this study were 1) to establish validity and reliability for a modified service test, 2) to determine male and female norms for the service test, and 3) to establish norms for the Kemp-Vincent Rally Test. Subjects were 677 students enrolled in beginning and intermediate tennis classes at North Texas State University, Denton, Texas. Data were analyzed by the two-way analysis of variance to establish reliability. Norms were established by converting raw scores to normalized standard T-scores. Conclusions of the investigation were 1) the modified service test is valid and reliable, and 2) there is a need for separate male and female norms when the skill is governed by strength.
Date:
August 1978
Creator:
Avery, Cathy Ann
System:
The UNT Digital Library
Evaluation of a Constructed Wetland to Reduce Toxicity from Diazinon at the Pecan Creek Wastewater Treatment Plant, Denton, TX
The City of Denton Pecan Creek Wastewater Treatment Facility has periodically failed effluent toxicity testing. A Toxicity Identification Evaluation has determined that Diazinon in the effluent is contributing to the observed toxicity. Chlorpyrifos is also implicated as a factor. The City of Denton constructed a half acre experimental wetland to remove Diazinon related toxicity. Results from spiking and microcosm experiments indicate that the wetland can reduce the Diazinon.
Date:
May 1996
Creator:
Baerenklau, Amy L. (Amy Lyn)
System:
The UNT Digital Library