UNT Theses and Dissertations - Browse

ABOUT BROWSE FEED

Evaluating the Habitat Requirements of the Golden Orb Mussel (Quadrula Aurea) for Conservation Purposes

Description: Many freshwater mussels are imperiled, due to a number of interrelated factors such as habitat alteration, degradation of water quality, and impoundments. The Golden Orb mussel (Quadrula aurea, I. Lea, 1859) is endemic to the state of Texas and is currently a candidate for the endangered species list, as the number of known populations has been declining in recent years. Little is currently known about Q. aurea aside from basic distribution data. This study is focused on evaluating a combination of macro-habitat and micro-habitat variables to determine their influence on the distribution and density of this species. Macro-habitat variables, including dominant land cover, surface geology, and soil erodibility factor, did not have a significant relationship with mussel distributions. The best model of micro-habitat variables that impacts the Q. aurea distributions is comprised of relative substrate stability (RSS) at moderate flows and current velocity at low flows. For all mussel species in this study, current velocity at low flows is the primary variable that influences distribution. Q. aurea are associated with habitats where larger sediment particles (large gravel and cobble) help to stabilize the substrate in areas with higher current velocities. An understanding of the preferred habitats for Q. aurea can be used to help focus conservation efforts and practices.
Date: May 2013
Creator: Hammontree, Sarah
Partner: UNT Libraries

Evaluating the Provisions Made for Slow Learning Children in Iowa Park Elementary Schools

Description: The purpose of the study is to classify the retarded children from the viewpoint of selection for special education to determine the probable percentage of slow-learning children in the elementary school, and to evaluate the provisions made for the retarded group.
Date: August 1940
Creator: Kidwell, Rose Ethyle
Partner: UNT Libraries

Evaluating the Pulse Sensor as a Low-Cost and Portable Measurement of Blood Pulse Waveform

Description: This study was aimed at determining whether the digital volume pulse waveform using the Pulse Sensor can be used to extract features related to arterial compliance. The Pulse Sensor, a low-cost photoplethysmograph, measures green light reflection in the finger and generates output, which is indicative of blood flow and can be read by the low-cost Arduino UNO™. The Pulse Sensor code was modified to increase the sampling frequency and to capture the data in a file, which is subsequently used for waveform analysis using programs written in the R system. Waveforms were obtained using the Pulse Sensor during two 30-s periods of seated rest, in each of 44 participants, who were between the ages of 20 and 80 years. For each cardiac cycle, the first four derivatives of the waveform were calculated and low-pass filtered by convolution before every differentiation step. The program was written to extract 19 features from the pulse waveform and its derivatives. These features were selected from those that have been reported to relate to the physiopathology of hemodynamics. Results indicate that subtle features of the pulse waveform can be calculated from the fourth derivative. Feature misidentification occurred in cases of saturation or low voltage and resulted in outliers; therefore, trimmed means of the features were calculated by automatically discarding the outliers. There was a high efficiency of extraction for most features. Significant relationships were found between several of the features and age, and systolic, diastolic, and mean arterial blood pressure, suggesting that these features might be employed to predict arterial compliance. Further improvements in experimental design could lead to a more detailed evaluation of the Pulse Sensor with respect to its capability to predict factors related to arterial compliance.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: May 2016
Creator: Smithers, Breana Gray
Partner: UNT Libraries

Evaluating the Role of C-reactive Protein on Cognition and Depressive Symptoms Among Women by Mexican American Ethnicity

Description: C-reactive protein (CRP) is a protein found in the blood that is synthesized by the liver and has been extensively studied due to its role in inflammatory and atherosclerotic processes. The importance of this biomarker in its role in vascular risk factors is increased with several lines of evidence pointing to its association with cognitive decline. The association between CRP and depression has been increasingly analyzed by various cross-sectional studies. The research between CRP and depressive symptoms in older women has yet to generate consistent trends. In the present study, a series of regression analyses was used to explore the association between CRP and both cognitive function and depressive symptomatology among a group of rural-dwelling women. Associations were evaluated through the use of data from Project FRONTIER, a rural-based research looking at both physical and cognitive aspects of health in rural-dwelling adults and elders. Comparisons were made between Mexican American women and a group of non-Hispanic Caucasian women. CRP was a significant independent predictor of total depression (beta = -.11, t = -1.99, p =.048). CRP was also a significant independent predictor of symptoms associated with meaningless within depression (beta = -.16, t = -2.94, p =.004). Contrary to prediction, CRP was not a significant independent predictor of overall cognitive function or performance in five specific cognitive domains. There is still needed evaluation on racial/ethnic differences present in regard to the impact of varied health factors on mental health within a culturally rich, rural cohort. It is recommended that future studies utilize standardized measurement of cognitive function to facilitate a more thorough understanding and comparison of change in this particular population.
Date: August 2014
Creator: Huerta, Serina
Partner: UNT Libraries

Evaluating the Role of Design in the Apparel Industry in the United States

Description: The purpose of this study was to better understand the role of design in the product development process in the apparel industry in the United States, looking for variations in how design is used in the industry. In order to obtain a snapshot of the fashion design industry, creativity, originality, innovation, and product development were examined, as well as corporate culture and strategic orientation. The study also sought to examine pedagogical strategies based on these findings. A mixed methods approach, consisting of an on-line survey and interviews, was employed. The findings suggest variations in the role of design based on the time design-department employees spent on creative tasks. These variations were examined and industrial and pedagogical implications are explored. The significance of this study relates to the findings of the importance of creativity in the product development process of the apparel industry in the United States, as well as considerations for pedagogical strategies.
Date: August 2014
Creator: Beard, Diana
Partner: UNT Libraries

Evaluating the Scalability of SDF Single-chip Multiprocessor Architecture Using Automatically Parallelizing Code

Description: Advances in integrated circuit technology continue to provide more and more transistors on a chip. Computer architects are faced with the challenge of finding the best way to translate these resources into high performance. The challenge in the design of next generation CPU (central processing unit) lies not on trying to use up the silicon area, but on finding smart ways to make use of the wealth of transistors now available. In addition, the next generation architecture should offer high throughout performance, scalability, modularity, and low energy consumption, instead of an architecture that is suitable for only one class of applications or users, or only emphasize faster clock rate. A program exhibits different types of parallelism: instruction level parallelism (ILP), thread level parallelism (TLP), or data level parallelism (DLP). Likewise, architectures can be designed to exploit one or more of these types of parallelism. It is generally not possible to design architectures that can take advantage of all three types of parallelism without using very complex hardware structures and complex compiler optimizations. We present the state-of-art architecture SDF (scheduled data flowed) which explores the TLP parallelism as much as that is supplied by that application. We implement a SDF single-chip multiprocessor constructed from simpler processors and execute the automatically parallelizing application on the single-chip multiprocessor. SDF has many desirable features such as high throughput, scalability, and low power consumption, which meet the requirements of the next generation of CPU design. Compared with superscalar, VLIW (very long instruction word), and SMT (simultaneous multithreading), the experiment results show that for application with very little parallelism SDF is comparable to other architectures, for applications with large amounts of parallelism SDF outperforms other architectures.
Date: December 2004
Creator: Zhang, Yuhua
Partner: UNT Libraries

Evaluating Tree Seedling Survival and Growth in a Bottomland Old-field Site: Implications for Ecological Restoration

Description: In order to assess the enhancement of seedling survival and growth during drought conditions, five-hundred bare-root seedlings each of Shumard oak (Quercus shumardii Buckl.) and green ash (Fraxinus pennsylvanica Marsh.) were planted each with four soil amendments at a Wildlife Management Area in Lewisville, Texas. The treatments were a mycorrhizal inoculant, mulch fabric, and two superabsorbent gels (TerraSorb® and DRiWATER®). Survival and growth measurements were assessed periodically for two years. Research was conducted on vegetation, soil, and site history for baseline data. Both superabsorbent gels gave significant results for Shumard oak survival, and one increased green ash diameter. For overall growth, significant results were found among DRiWATER®, mycorrhizae, and mulch treatments.
Date: August 2007
Creator: Boe, Brian Jeffrey
Partner: UNT Libraries

An Evaluation and Analysis of Teachers' Codes of Ethics

Description: The problem of this thesis was to study the codes of thirteen other states and, in addition, the codes of Texas and the National Education Association, were selected because of the realization that a very small per cent of the teaching profession knows of the existence of such codes and a still smaller per cent knows anything at all of the content of the codes.
Date: 1946
Creator: Enlow, Nannie Holland
Partner: UNT Libraries

An Evaluation and Comparison of the Music Hour Series and the World of Music Series as Appropriate Basic Texts for Elementary Music

Description: An important and unending responsibility of the music teacher is the competent evaluation of available basic text-series. It seems obvious that before any text-series, or any single book, is adopted for use in the public school music classes, a process of assessing the available series or single volumes should precede the final decision and purchase. Since a thorough search in music education literature has failed to reveal any set of formal rules of analysis, the writer has thought it possible to use those general principles recommended by two authoritative sources, The Psychology of School Music Teaching by Mursell and Glenn, and Music in the Grade Schools by Gehrkens in collaboration with personal ideas obtained from professional study of music teaching and experience as a music teacher.
Date: August 1941
Creator: Ford, Rosedell Helm
Partner: UNT Libraries

The evaluation, development, and application of the correlation consistent basis sets.

Description: Employing correlation consistent basis sets coupled with electronic structure methods has enabled accurate predictions of chemical properties for second- and third-row main group and transition metal molecular species. For third-row (Ga-Kr) molecules, the performance of the correlation consistent basis sets (cc-pVnZ, n=D, T, Q, 5) for computing energetic (e.g., atomization energies, ionization energies, electron and proton affinities) and structural properties using the ab initio coupled cluster method including single, double, and quasiperturbative triple excitations [CCSD(T)] and the B3LYP density functional method was examined. The impact of relativistic corrections on these molecular properties was determined utilizing the Douglas-Kroll (cc-pVnZ-DK) and pseudopotential (cc-pVnZ-PP) forms of the correlation consistent basis sets. This work was extended to the characterization of molecular properties of novel chemically bonded krypton species, including HKrCl, FKrCF3, FKrSiF3, FKrGeF3, FKrCCF, and FKrCCKrF, and provided the first evidence of krypton bonding to germanium and the first di-krypton system. For second-row (Al-Ar) species, the construction of the core-valence correlation consistent basis sets, cc-pCVnZ was reexamined, and a revised series, cc-pCV(n+d)Z, was developed as a complement to the augmented tight-d valence series, cc-pV(n+d)Z. Benchmark calculations were performed to show the utility of these new sets for second-row species. Finally, the correlation consistent basis sets were used to study the structural and spectroscopic properties of Au(CO)Cl, providing conclusive evidence that luminescence in the solid-state can be attributed to oligomeric species rather than to the monomer.
Date: December 2006
Creator: Yockel, Scott
Partner: UNT Libraries

An Evaluation Model for Identifying Lewisville and San Angelo, Texas, as Senior Ready Communities

Description: This research portrays a paradigm for the assessment of aging services to support populations aging in place. The dissertation was designed to establish a model to identify and evaluate senior ready communities. Area specific social programs and services are identified. In order to meet the growing needs of aging populations, the dynamic representation of existing services and the need for services that could be developed in certain communities require reevaluation in current planning, restructuring, and/or community development.
Date: December 2009
Creator: Sanders, David N.
Partner: UNT Libraries

Evaluation of a Common Carp (Cyprinus carpio L.) Exclusion and Trapping Device for Use in Aquatic Plant Founder Colony Establishment

Description: The focus of this study was to design and evaluate a trapping system that would reduce populations of common carp within water bodies in conjunction with establishment of native aquatic macrophytes founder colonies. A pond study and field study were conducted. A pond study was performed at the Lewisville Aquatic Ecosystem Research Facility, located in Lewisville, Texas, followed by a field study within a constructed wetland located in southern Dallas, Texas. For the pond study, twelve funnel traps were constructed (four reps of each type: control, dual-walled and ring cage). Two anti-escape devices were tested with funnels including steel fingers and hinged flaps. Ring cage and dual-walled treatments were planted using native pondweeds, while controls were left unplanted (additional bait and a drift fence scenarios were also tested). Common carp were introduced into the study pond. Chi-square statistical analyses were utilized and showed ring cage treatments using fingers as well as the use of a drift fence to be most effective. Following completion of the pond study, the two most effective treatments (controls and ring cages) were tested within the Dallas, Texas wetland; no carp were caught during the field test.
Date: May 2008
Creator: Williams, Paul Edwin
Partner: UNT Libraries

Evaluation of a Constructed Wetland to Reduce Toxicity from Diazinon at the Pecan Creek Wastewater Treatment Plant, Denton, TX

Description: 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)
Partner: UNT Libraries

An Evaluation of a Guidance-Structured Summer Session for Entering University Freshmen

Description: The problem of this study was to evaluate the effectiveness of a guidance-structured summer session for entering university freshmen. The performances of students entering this type of program were compared with those of students entering a traditional type of summer school. Inferences made relating to the contributions of a guidance-structured summer session to entering university freshmen were based on analyses of the following characteristics: (1) performance on standardized tests; (2) certain aspects relating to high school background; (3) academic achievement and retention at Texas A. and M. University; (4) fathers' attendance at Texas A. and M. University; and (5) fathers' occupations.
Date: January 1966
Creator: McCandless, Charles Emery, 1931-
Partner: UNT Libraries

Evaluation of a Master of Divinity Program in a Theological Seminary

Description: The objective of this research project was to evaluate the effectiveness of the M.Div. program of Alliance Bible Seminary, Hong Kong. The research was designed for evaluation based solely upon the perceptions of the participant (graduate). The research identified and described the graduates enrolled, assessed perceived career development and attainment, and measured the degree of satisfaction experienced by the graduates who have matriculated from the degree program. A questionnaire was mailed to obtain the necessary data from the graduates of the M.Div. program of Alliance Bible Seminary. The questionnaire which was used was adapted from a previously used one used in the study of graduate educational programs. It has been tested in two other previous studies and was deemed effective. In order to verify its effectiveness in the Eastern context, a pilot test was conducted before the formal research, and the adapted questionnaire was found effective. Responses to the questionnaire were coded and the SPSS system was used to analyze the data. Tables and figures were constructed showing frequencies and significant differences where they occurred. Generally, the graduates at Alliance Bible Seminary were very satisfied with their educational experiences. Both males and females indicated that they would choose the same path again, and would recommend the program to others. The graduates were having full-time employment in the field of Christian ministry, and were positively attaining their career goals. The steps leading to the degree at Alliance Bible Seminary were perceived as very helpful and useful, not just the course work and independent reading, but also extre-curricular activities such as voluntary work on campus, Student Evangelistic Band, and interaction with faculty. Some aspects of the program need improvement and consolidation, such as freshmen advising in the majors, course work in the core, quality of instruction, varieties of course offered, and access ...
Date: December 2000
Creator: Lui, Cheuk-On
Partner: UNT Libraries