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DNA-DNA Hybridization of Methane Oxidizing Bacteria
Bacteria classified in the family Methylomonadaceae must derive their carbon from one-carbon compounds. They are characterized by the possession of internal membranes of two types. Type I membranes are layered and fill the middle of the cells while type II membranes form concentric layers around the periphery of the cells. Also, there are two metabolic pathways by which the methylobacteria assimilate one-carbon compounds. Further evidence of this dichotomy was sought by DNA-DNA saturation hybridization of DNAs from both types of methylobacteria. Very low DNA-DNA homology was seen between types I and II or within the types. It was not possible, therefore, to correlate the degree of genetic relatedness with either the nature of the internal membranes or the pathway of carbon assimilation.
Date:
December 1976
Creator:
Ackerson, Jill W.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Perceived Effect of the Quarter System on the Programs of Selected Middle Schools in the State of Texas
The problem of this study was to analyze the effect that a legislature-mandated quarter system was having on certain selected middle schools in the State of Texas, Some educators have claimed that the quarter system makes it possible to add flexibility to school programs. This study, therefore, was an attempt to find out if local school districts were taking advantage of this opportunity. A second goal of the study was to determine how principals, teachers, and curriculum directors felt about the manner in which schools were implementing certain teaching strategies which experts in this field have recommended for use in middle schools. It was concluded that the schools were not taking advantage of the quarter system in order to more nearly approach the middle school concept. Educators do not seem to be against the innovations proposed by middle school authorities so it would seem that the time is right for a full commitment to the area of schooling for the middle years. The support of the general public then will be a key factor in the success of the middle school. Educators must make an effort to keep the public better informed about the way children learn and grow if …
Date:
August 1977
Creator:
Acuff, George D.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Value of Filmstrips in the Third Grade
The purpose of this study is to determine the possible influence of the use of filmstrip material upon a group of third-grade pupils as compared with another group of third-grade pupils not using filmstrip materials.
Date:
1950
Creator:
Adair, Elva Gaynelle
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Working Bibliography on the Art of Drawing
This working bibliography of 835 publications on the art of drawing is presented in five categories: Educational and Psychological, Historical, "How-to," Technical, and Techniques of Teaching Drawing. The latter category is annotated, offering a synthesis of the areas of art education and drawing. This bibliography is designed for scholars, artists, and teachers as well as students of the many facets of drawing.
Date:
August 1974
Creator:
Adair, Rosalind Emily
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Vibrational Spectra and Potential Function of Tetrachlorocyclopropene
The laser Raman spectra of tetrachlorocyclopropene in the liquid and solid phases have been recorded and vibrational assignments are presented. These results along with root mean squared vibrational amplitudes from electron diffraction data have been employed in a normal coordinate analysis in which a 19 parameter potential function is refined. This potential function, originally expressed in terms of compliance constants, is then used to derive the corresponding conventional and relaxed force constants.
Date:
August 1981
Creator:
Adame, I. Ernesto (Ignacio Ernesto)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Online Construction of Android Application Test Suites
Mobile applications play an important role in the dissemination of computing and information resources. They are often used in domains such as mobile banking, e-commerce, and health monitoring. Cost-effective testing techniques in these domains are critical. This dissertation contributes novel techniques for automatic construction of mobile application test suites. In particular, this work provides solutions that focus on the prohibitively large number of possible event sequences that must be sampled in GUI-based mobile applications. This work makes three major contributions: (1) an automated GUI testing tool, Autodroid, that implements a novel online approach to automatic construction of Android application test suites (2) probabilistic and combinatorial-based algorithms that systematically sample the input space of Android applications to generate test suites with GUI/context events and (3) empirical studies to evaluate the cost-effectiveness of our techniques on real-world Android applications. Our experiments show that our techniques achieve better code coverage and event coverage compared to random test generation. We demonstrate that our techniques are useful for automatic construction of Android application test suites in the absence of source code and preexisting abstract models of an Application Under Test (AUT). The insights derived from our empirical studies provide guidance to researchers and practitioners involved …
Date:
December 2017
Creator:
Adamo, David T., Jr.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Joint Schemes for Physical Layer Security and Error Correction
The major challenges facing resource constraint wireless devices are error resilience, security and speed. Three joint schemes are presented in this research which could be broadly divided into error correction based and cipher based. The error correction based ciphers take advantage of the properties of LDPC codes and Nordstrom Robinson code. A cipher-based cryptosystem is also presented in this research. The complexity of this scheme is reduced compared to conventional schemes. The securities of the ciphers are analyzed against known-plaintext and chosen-plaintext attacks and are found to be secure. Randomization test was also conducted on these schemes and the results are presented. For the proof of concept, the schemes were implemented in software and hardware and these shows a reduction in hardware usage compared to conventional schemes. As a result, joint schemes for error correction and security provide security to the physical layer of wireless communication systems, a layer in the protocol stack where currently little or no security is implemented. In this physical layer security approach, the properties of powerful error correcting codes are exploited to deliver reliability to the intended parties, high security against eavesdroppers and efficiency in communication system. The notion of a highly secure and reliable …
Date:
August 2011
Creator:
Adamo, Oluwayomi Bamidele
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
VLSI Architecture and FPGA Prototyping of a Secure Digital Camera for Biometric Application
This thesis presents a secure digital camera (SDC) that inserts biometric data into images found in forms of identification such as the newly proposed electronic passport. However, putting biometric data in passports makes the data vulnerable for theft, causing privacy related issues. An effective solution to combating unauthorized access such as skimming (obtaining data from the passport's owner who did not willingly submit the data) or eavesdropping (intercepting information as it moves from the chip to the reader) could be judicious use of watermarking and encryption at the source end of the biometric process in hardware like digital camera or scanners etc. To address such issues, a novel approach and its architecture in the framework of a digital camera, conceptualized as an SDC is presented. The SDC inserts biometric data into passport image with the aid of watermarking and encryption processes. The VLSI (very large scale integration) architecture of the functional units of the SDC such as watermarking and encryption unit is presented. The result of the hardware implementation of Rijndael advanced encryption standard (AES) and a discrete cosine transform (DCT) based visible and invisible watermarking algorithm is presented. The prototype chip can carry out simultaneous encryption and watermarking, which …
Date:
August 2006
Creator:
Adamo, Oluwayomi Bamidele
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Differential Study of Reasons Why Students Drop Out of School as Related to Actual Dropout-preventive Practices of a Metropolitan School District
The problem of this study was the differentiation of high schools in a metropolitan school district from the standpoint of the measures taken to prevent student dropouts.
Date:
August 1972
Creator:
Adams, Ambrose Davidson, 1936-
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Someone to Talk to: Conversations Between Friends in a Junior High Lunch Room
Quantitative studies dominate early adolescence research, a field which also lacks an understanding of communication behaviors between early adolescents. This study uses the qualitative methods of participant observation and informal interviews to observe conversations between girls in a junior high lunch room. Friendship characteristics and group socialization are discussed as they emerged from the field data. First, friendship hierarchies (best friend, close friend, and friend) may be adult-imposed structures. Hierarchies are not prominent in the minds of friends as they relate to each other in daily conversation. Second, friendship groups serve to socialize early adolescent girls.
Date:
December 1990
Creator:
Adams, Brenda Inglis
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
An Analysis of Perceptions of Teacher Effectiveness
The study was designed to determine and compare the perceptions of various groups with regard to the most and the last important characteristics and behaviors of effective teachers. The population for the study included (a) four groups of high school graduates selected at five year intervals beginning with 1980, (b) four groups of high school dropouts selected from the same five year intervals, (c) high school teachers, (d) high school principals and central office administrators, and (f) teacher educators. The instrument used to determine perceptions was a 28 item Q-sort. The items of the Q-sort were developed from a review of the literature on teacher effectiveness and from a review of the criteria for the evaluation of teacher effectiveness as used by the school district in which the study was conducted. The Q-sort items were deemed valid by a panel of teacher educators.
Date:
May 1983
Creator:
Adams, Byrtie Baker
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Solutions of the Equations of Radiative Transfer by an Invariant Imbedding Approach
This thesis is a study of the solutions of the equations of radiative transfer by an invariant imbedding approach.
Date:
January 1969
Creator:
Adams, Charles N.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Development of Dramatic Exposition in the Plays of George Farquhar
The purpose of this thesis is to make further contribution in filling the gap in detailed analyses of George Farquhar's plays.
Date:
August 1965
Creator:
Adams, Dale Talmadge
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Female Inheritors of Hawthorne's New England Literary Tradition
Nineteenth-century women were a mainstay in the New England literary tradition, both as readers and authors. Indeed, women were a large part of a growing reading public, a public that distanced itself from Puritanism and developed an appetite for novels and magazine short stories. It was a culture that survived in spite of patriarchal domination of the female in social and literary status. This dissertation is a study of selected works from Nathaniel Hawthorne, Sarah Orne Jewett, and Mary E. Wilkins Freeman that show their fiction as a protest against a patriarchal society. The premise of this study is based on analyzing these works from a protest (not necessarily a feminist) view, which leads to these conclusions: rejection of the male suitor and of marriage was a protest against patriarchal institutions that purposely restricted females from realizing their potential. Furthermore, it is often the case that industrialism and abuses of male authority in selected works by Jewett and Freeman are symbols of male-driven forces that oppose the autonomy of the female. Thus my argument is that protest fiction of the nineteenth century quietly promulgates an agenda of independence for the female. It is an agenda that encourages the woman to …
Date:
August 1994
Creator:
Adams, Dana W. (Dana Wills)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Study of Pragmatism: its Influence on Certain Modern Trends in Education
It is the purpose of this thesis to show that the pragmatic philosophy is basically responsible for present-day developments in various teaching techniques.
Date:
1941
Creator:
Adams, Donald Quincy
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Color Concepts for the Art Student
The problem of this study is to determine the degree to which color concepts should be taught to the art student. There is a survey of the awareness of color through art history, the introduction of certain historical and recent information in the fields of physics, physiology, and psychology in relation to color and the art student, a review of the symbolic nature of color, an examination of the development of color notation or theories utilized by art students, and an attempt to integrate color more fully with the other art elements.
Date:
December 1983
Creator:
Adams, Donna Finch
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Neural Network Classifiers for Object Detection in Optical and Infrared Images
This thesis presents a series of neural network classifiers for object detection in both optical and infrared images. The focus of this work is on efficient and accurate solutions. The thesis discusses the evolution of the highly efficient and tiny network Binary Classification Vision Transformer (BC-ViT) and how through thoughtful modifications and improvements, the BC-ViT can be utilized for tasks of increasing complexity. Chapter 2 discusses the creation of BC-ViT and its initial use case for underwater image classification of optical images. The BC-ViT is able to complete its task with an accuracy of 99.29\% while being comprised of a mere 15,981 total trainable parameters. Chapter 3, Waste Multi-Class Vision Transformer (WMC-ViT), introduces the usefulness of mindful algorithm design for the realm of multi-class classification on a mutually exclusive dataset. WMC-ViT shows that the task oriented design strategy allowed for a network to achieve an accuracy score of 94.27\% on a five class problem while still maintaining a tiny parameter count of 35,492. The final chapter demonstrates that by utilizing functional blocks of BC-ViT, a simple and effective target detection algorithm for infrared images can be created. The Edge Infrared Vision Transformer (EIR-ViT) showed admirable results with a high IoU …
Date:
December 2023
Creator:
Adams, Ethan Richard
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Vegetation and Habitat Factors of Red River County, Texas
The aim of this study has been to measure some of the ecological factors in a series of plant habitats and their relation to the existing vegetation in selected twenty soil types of Red River County, Texas.
Date:
August 1938
Creator:
Adams, Exa T.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Base Effects on the Thermal Decomposition of Sec-butyllithium Solutions
The pyrolysis of sec-butyllithium in solution was studied in an attempt to understand the loss of stereo-specificity and the atypical kinetics that have been reported. Additionally, the effect of added lithium alkoxides was studied to determine their effects on the highly reactive sec-butyllithium substrate.
Date:
June 1966
Creator:
Adams, George Michael
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Study of the Bacterial Flora of Food Utensils in Hardin College Cafeteria and Twenty-Five Eating Establishments in Wichita Falls, Texas
The problem of this thesis consists primarily of a bacteriological survey of the eating utensils of Hardin College Cafeteria and twenty-five other eating establishments in the city of Wichita Falls, Texas. This investigation was made primarily with reference to a determination of the possible presence of typhoid and related organisms, and secondarily to an investigation of the actual presence of those bacterial organisms associated with the more common outbreaks of food poisoning.
Date:
1949
Creator:
Adams, Isaac Newton
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Relationship Between Self-Reported Stress Levels and Job Satisfaction Among Elementary and Secondary School Principals
The problem with which this investigation is concerned is that of determining the nature of the differences and relationships between self-reported levels of stress and job satisfaction of elementary and secondary school principals in a selected school support region. This research effort employed a co-relational design. A random sample of 100 elementary and 100 secondary school principals were selected to participate in the study, for which the response rate was 93 per cent. The principals were mailed the Morse Index of Employee Satisfaction and the Spielberger State-Trait Anxiety Inventory, Part A, and asked to assess their own job satisfaction and stress levels.
Date:
August 1983
Creator:
Adams, James R. (James Russell)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Contingency Contracting Effects on Psychotherapy Attendance and Termination at Two Community Mental Health Centers
Contingency management has been utilized to improve treatment compliance and attendance in a medical setting. A related question involves the effect of contingency management on attendance in outpatient psychotherapy. Sixty-nine individuals ranging in age from 8 to 50 years agreed to participate in such a study. These individuals agreed to sign a contract specifying consequation for failure to notify the centers 24 hours in advance of an impending absence. Data on attendance and notification of impending absences were collected weekly for five sessions. After five sessions, dropouts and remainers were interviewed and the course of treatment was discussed. For the purpose of this study, a "dropout" occurred whenever an individual terminated therapy by missing an appointment and not rescheduling, or whenever an individual missed three consecutive appointments.
Date:
May 1981
Creator:
Adams, Joe B. (Joe Bayless), 1949-
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Relationship Between Supplemental Instruction Leader Learning Style and Study Session Design
The purpose of this qualitative study was to examine the learning styles of supplemental instruction leaders at a large, public university during the fall 2010 semester and determine whether or not their personal learning styles influenced the way they designed and developed out-of-class study sessions. The total population of supplemental instruction leaders was 37, of which 24 were eligible to participate in the study. Of the 24 eligible supplemental instruction leaders, 20 completed the entire study. Participants in the study included nine male and 11 female supplemental instruction leaders with a median age of 22.25 years-old. Seventeen participants indicated their classification as senior, two as junior, and one as sophomore. Of the participants, 16 indicated white as a race or ethnicity, one indicated Asian, two indicated African American, and one indicated both American Indian/Alaska Native and white. Supplemental instruction leader learning style was assessed using the Kolb Learning Style Inventory. Leaders were then interviewed, and their study sessions were analyzed. Through triangulation of data from learning style, interviews and actual study session documents, four major themes emerged. The four themes were: 1) incorporation of personal experience into study session design, 2) the sense of impact on student learning, 3) a …
Date:
May 2011
Creator:
Adams, Joshua
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Individualized Instruction in the Elementary School
The purpose of this study is to investigate the more recent types of instruction. In this investigation, emphasis has been placed on instruction which has grown out of children's interests and needs, and which recognizes the capacities, abilities and potentialities of children.
Date:
1943
Creator:
Adams, Juanita Sunshine
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library