UNT Theses and Dissertations - 18,899 Matching Results

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Temporal Properties Of Dynamic Processes On Complex Networks

Description: Many social, biological and technological systems can be viewed as complex networks with a large number of interacting components. However despite recent advancements in network theory, a satisfactory description of dynamic processes arising in such cooperative systems is a subject of ongoing research. In this dissertation the emergence of dynamical complexity in networks of interacting stochastic oscillators is investigated. In particular I demonstrate that networks of two and three state stochastic oscillators present a second-order phase transition with respect to the strength of coupling between individual units. I show that at the critical point fluctuations of the global order parameter are characterized by an inverse-power law distribution and I assess their renewal properties. Additionally, I study the effect that different types of perturbation have on dynamical properties of the model. I discuss the relevance of those observations for the transmission of information between complex systems.
Date: December 2011
Creator: Turalska, Malgorzata A.
Partner: UNT Libraries

Assessment and Treatment of Multiple Topographies of Self-injury Maintained by Separate Reinforcement Contingencies

Description: Functional analysis procedures were used to assess and treat multiple topographies of self-injurious behavior exhibited by an individual. An experimental functional analysis indicated that one topography, hand biting, appeared to be maintained by social positive reinforcement in the form of delivery of tangible items. The analysis also provided evidence that a second form of self-injury, skin picking, was automatically reinforced. To treat positively reinforced hand biting, access to a preferred tangible was arranged contingent on the omission of biting for a prespecified time interval. Hand biting was nearly eliminated, and low rates were maintained as the schedule of reinforcement was thinned to 10 min. Competing stimulus assessments identified that magazines effectively suppressed all occurrences of skin picking; therefore, noncontingent access to magazines was implemented. Using a combination of multielement and multiple baseline designs, we were able to demonstrate that the two topographies of self-injury were maintained by independent reinforcement contingencies and that interventions corresponding to each topography and function effectively treated both behaviors.
Date: August 2011
Creator: Pace, Amy
Partner: UNT Libraries

A Study on the Stability of Self-concept

Description: There are two major purposes of this study. First, it will attempt to ascertain whether self-concept, as measured by a self-concept scale, will fluctuate significantly due to a recent ego inflating or deflating experience, and if so, how lasting and in what areas are the effects. Secondly, it will note whether or not the low self-concept individual is more susceptible to changes in self-concept due to these environmental changes than the high self-concept individual.
Date: January 1964
Creator: Collman, Robert Bernard
Partner: UNT Libraries

Effects of pH and Substrate on Growth of Escherichia Coli and Pseudomonas Aeruginosa in Mixed Continuous Culture

Description: The express purpose for doing this project was to develop methods for the continuous culture of E. coli and P. aeruginosa as a mixed population, and to apply these methods in studying the effects of pH and substrate upon the growth of these two organisms in mixed continuous culture.
Date: January 1964
Creator: Cooper, Billy Howard
Partner: UNT Libraries

The Artist in Durrell's Alexandria Quartet

Description: Self-knowledge serves as the basis for further insight into other themes and ideas. The investigation proceeds, then, from the search for self to the somewhat higher plane of the role of the artist in society; it is completed with an analysis of the motivations which lead the artist into an attainment of complete artistic fulfillment.
Date: January 1964
Creator: Fry, Phillip Lee
Partner: UNT Libraries

Thermomagnetic Phenomena in Antimony at Liquid Helium Temperatures

Description: The purpose of this investigation was to study head-transport phenomena in a single crystal of antimony at liquid helium temperatures. In particular, the longitudinal and transverse components of the thermal resistivity tensor were measured as a function of magnetic field up to eighteen kilogauss.
Date: January 1964
Creator: Haywood, Charles Thomas
Partner: UNT Libraries

The Effects of Heparin on the Development of Resistance to Antibiotics by Staphylococcus Aureus

Description: Since heparin combines with some antibiotics to decrease the toxicity of the antibiotic to the patient, the purpose of this investigation is to determine whether it has any effect upon the development of resistance to antibiotics by Staphylococcus aureus.
Date: August 1959
Creator: Blanton, William George
Partner: UNT Libraries

A Study of the Concurrent Validity of the AC Test of Creative Ability in a College Situation

Description: The purpose of this study is twofold. First, it is to obtain further evidence of the concurrent validity of the AC Test of Creative Ability. Further, and more specifically, it is concerned with the generalization of previously indicated validity of the AC Test to a college situation.
Date: August 1963
Creator: Baxter, Patricia James
Partner: UNT Libraries

Kiln-Fired Glass in the Junior College Arts and Crafts Program

Description: The problem with which this investigation is concerned is the discovery of suitable uses for the enameling kiln in the arts and crafts program at the junior college level in the production of kiln-formed glass and the testing of methods and materials that will permit work of aesthetic merit at a nominal cost to the students and the school.
Date: August 1963
Creator: Buchanan, Robert Gordon
Partner: UNT Libraries

An Infrared Study of some Ω-Phenyl and Ω-Benzoyl Alkanoic Acids

Description: There is no available information in the literature on interaction between carboxyl hydrogen and ω-phenyl groups. Consequently, it was of interest to seek such interactions. Some form of interaction is evident from the study of the spectra of some phenylalkanoic acids and benzoyalkanoic acids.
Date: August 1963
Creator: Chanslor, Robert Janes
Partner: UNT Libraries

Magnetically Driven Instabilities in Gas Discharges

Description: In the present experiment a gas discharge plasma generator was designed and constructed and a search was made for evidence of a plasma instability due to the influence of an externally applied magnetic field. The evidence for such an unstable mode of operation is too indirect to make a possible conclusion, but an approach to more certain identification will be indicated.
Date: August 1963
Creator: Choate, Jimmie W.
Partner: UNT Libraries

The Relationship between the Hunter and the Hunted: Moby Dick, The Old Man and the Sea, and The Bear

Description: The purpose of this thesis is to point out explicitly the rather startling fact that each of these three writers in a novel which is representative of his own art and world view had developed the hunt-quest theme in a pattern and manner which are almost identical.
Date: August 1963
Creator: Egner, Ruth Ann
Partner: UNT Libraries