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A Preliminary Controller Design for Drone Carried Directional Communication System
In this thesis, we conduct a preliminary study on the controller design for directional antenna devices carried by drones. The goal of the control system is to ensure the best alignment between two directional antennas so as to enhance the performance of air-to-air communication between the drones. The control system at the current stage relies on the information received from GPS devices. The control system includes two loops: velocity loop and position loop to suppress wind disturbances and to assure the alignment of two directional antennae. The simulation and animation of directional antennae alignment control for two-randomly moving drones was developed using SIMULINK. To facilitate RSSI-based antenna alignment control to be conducted in the future work, a study on initial scanning techniques is also included at the end of this thesis.
Date:
August 2015
Creator:
AL-Emrani, Firas
System:
The UNT Digital Library
Comparison of the Personalities of Non-Injured and Injured Female Athletes in Intercollegiate Competition
This study was designed to determine if differences exist between the personalities of injured and non-injured athletes, injured and non-injured athletes in individual sports, and injured and non-injured athletes in team sports. Subjects were forty-three female athletes selected from six intercollegiate teams. The test instrument was the Cattell Sixteen Personality Factor Questionnaire. Data were analyzed by the two-way analysis of variance. Alpha was .05. Conclusions of the investigation were that the personality of injured athletes does not differ from the personality of non-injured athletes, that non-injured athletes in individual sports are more self-assured than non-injured athletes in team sports, and that the personality of athletes in team sports does not differ from the personality of athletes in individual sports.
Date:
December 1976
Creator:
Abadie, Deborah A.
System:
The UNT Digital Library
Soviet Oil Politics and the Middle East
This investigation, covering the past two decades, attempts to determine what benefits the Soviets have sought to gain in their relationships with Middle Eastern oil-producing nations. Chapter I surveys the U.S.S.R.'s oil industry and its tentative prospects for the 1980's. Chapter II discusses Soviet involvement in the Middle East since 1950, including nationalization and oil embargoes. In Chapter III, developments less favorable to the U.S.S.R. are, analyzed: the growing influence of conservative, anti -Soviet oil-producing states and the deradicalization of other Middle Eastern nations. Chapter IV concludes that the Soviets have met with varying success in their Middle Eastern involvements. The future of their oil industry remains uncertain.
Date:
December 1979
Creator:
Abbas, Ehsan A. R.
System:
The UNT Digital Library
Convergence of Infinite Series
The purpose of this paper is to examine certain questions concerning infinite series. The first chapter introduces several basic definitions and theorems from calculus. In particular, this chapter contains the proofs for various convergence tests for series of real numbers. The second chapter deals primarily with the equivalence of absolute convergence, unconditional convergence, bounded multiplier convergence, and c0 multiplier convergence for series of real numbers. Also included in this chapter is a proof that an unconditionally convergent series may be rearranged so that it converges to any real number desired. The third chapter contains a proof of the Silverman-Toeplitz Theorem together with several applications.
Date:
August 1983
Creator:
Abbott, Catherine Ann
System:
The UNT Digital Library
Synthesis of the Personal and the Political in the Works of May Stevens
This thesis is an investigation of the way in which the painter May Stevens (b. 1924) synthesizes her personal experiences and political philosophy to form complex and enduring works of art. Primary data was accumulated through an extended interview with May Stevens and by examining her works on exhibit in New York and Boston. An analysis of selected works from her "Big Daddy" and "Ordinary/Extraordinary" series revealed how her personal feelings about her own family became entwined with larger political issues. As an important member of the feminist art movement that evolved during the 1970s, she celebrated this new kinship among women in paintings that also explored the contradictions in their lives. In more recent work she has explored complex social issues such as teenage prostitution, sexism, and child abuse in a variety of artistic styles and media. This study investigates how May Stevens continues to portray issues of international significance in works that consistently engage the viewer on a personal, almost visceral level.
Date:
May 1998
Creator:
Abbott, Janet Gail
System:
The UNT Digital Library
A Preliminary Study of the Systemic Problems Underlying U.S.-East European Trade Relations
This study hypothesizes that the major barriers to expanded trade between the U.S. and Eastern Europe are systemic in nature. Using this approach, each political/ economic system is examined in an attempt to define the obstacles to foreign trade expansion, to describe the most important systemic and political factors at work, and to demonstrate how they have determined and will continue to shape the economic relationships between the U.S. and the countries of Eastern Europe. A final synthesis presents the two systems in a unified picture of the economic environment and concludes that significant trade expansion is unlikely in the near future due to basic systemic incompatibilities which impede the resolution of key foreign trade problems.
Date:
March 1981
Creator:
Abbott, Karen L.
System:
The UNT Digital Library
My Whine, Your Wine
Grapes hold the flavors of the lands where they grow, and when you make wine from them, those flavors of the land come through. Tasting wine from a place you've been can bring you back to that place with aromas and notes indicative of that place. A bottle of wine changes every day, and how it will taste depends on the moment you choose to release it from the glass walls. I have a vested interest in wine, because it is a living thing. I am compelled to make wine because its characteristics are like personality traits. Although some of those characteristics are harsh at times, I appreciate them all. Each trait plays an important role in the balance, the overall personality. Like my own personality flaws, wine's harsh tones can smooth over time. My relationship with wine is constantly evolving, with every new varietal, vintage, batch and blend. Believe me, after some of the jobs I had before my first day at Su Vino, I cherish every moment of my winemaking career. My Whine, Your Wine is the story of how it all started.
Date:
December 2011
Creator:
Abbott, Shannon Marie
System:
The UNT Digital Library
Landscape forest modeling of the Luquillo Experimental Forest, Puerto Rico.
This thesis contributes to modeling the dynamics of forest community response to environmental gradients and disturbances over a mountain landscape. A gap model (FACET) was parameterized for species of various forest types (Tabonuco, Colorado, Dwarf and Palm), for many terrain conditions and was modified and extended to include species response to excess soil moisture and hurricanes. Landscape cover types were defined by dominance of species of each forest type and canopy height. Parameters of the landscape model (MOSAIC) were calculated from multiple runs of FACET. These runs were determined by combining terrain variables (elevation and soil) and hurricane risk. MOSAIC runs were analyzed for distribution patterns. Geographic Information Systems software was used to process terrain variables, hurricane risk and MOSAIC model output.
Date:
December 2002
Creator:
Abbott-Wood, Chris
System:
The UNT Digital Library
Stimulus Control Effects of Changes in Schedules of Reinforcement
Sometimes, changes in consequences are accompanied by a clear stimulus change explicitly arranged by the experimenter. Other times when new consequences are in effect, there is little or no accompanying stimulus change explicitly arranged by the experimenter. These differences can be seen in the laboratory as multiple (signaled) schedules and mixed (unsignaled) schedules. The current study used college students and a single-subject design to examine the effects of introducing signaled and unsignaled schedules, and the transitions between them. In one phase, a card was flipped from purple to white every time the schedule was switched from VR-3 to FT-10. In another phase, the schedule still changed periodically, but the card always remained on the purple side. Results showed that the participants' responding was controlled by the schedule of reinforcement, by the color of the card, or both. These results suggest that changes in patterns of reinforcement lead to changes in stimulus control. In addition, the stimulus control for a behavior can come from several different sources. During teaching, it may facilitate the development of stimulus control to change the environment when a new behavior is required.
Date:
August 2020
Creator:
Abdel-Jalil, Awab
System:
The UNT Digital Library
A Comparison of the Reporting of International News in Two Algerian and Two United States Daily Newspapers
This study was concerned with determining how the Algerian dailies, El Moudjahid, and El Djomhouria, and the United States dailies, The New York Times and The Christian Science Monitor, which function in two different press systems, compare in reporting international news in terms of type and tension. This study concludes that the four dailies are similar in type of news; they report more news than editorials, more straight news than in-depth reports, more news of elites than common people, and more news from the Third World than from the Western World or the socialist bloc, and they differ in tension in that the tension within international news was higher in the two United States dailies than in the two Algerian dailies.
Date:
December 1980
Creator:
Abderrahmane, Azzi
System:
The UNT Digital Library
Social Control in the Newsroom: A Case Study
The problem of this study is to investigate how news policy in the Denton Record-Chronicle is defined and maintained and whether the newspaper staffers tend to conform to or conflict with the newspaper's news policy. The study suggests that the more experienced the staffer, the more likely he will conflict with the newspaper's news policy, and the less experienced the staffer, the more likely he will conform to the newspaper's news policy. Social control is in the hand of the newspaper organization. That is, the newspaper tends to control the mechanisms of social control. However, unless the newspaper recognizes the needs of the staffers' participation in its editorial decision, conflict may continue to be an important factor in the newsroom work-setting.
Date:
August 1982
Creator:
Abderrahmane, Azzi
System:
The UNT Digital Library
Comparative Ultrastructural Study between Young and Adult forms of Trypanosoma Lewisi
The purpose of this study was to examine the ultrastructure of both young (dividing form) and adult (stationary form) of Trypanosoma lewisi. Changes observed between the two forms of the organism were related directly to data obtained from previous comparative biochemical studies conducted on these forms of Trypanosoma lewisi.
Date:
August 1973
Creator:
Abdul-Salam, Jasem M.
System:
The UNT Digital Library
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
Cognitive Engagement in Later Life: Descriptive and Explanatory Findings
Findings on the relationship between engagement in lifestyle and cognitive functioning are not consistent; some authors report that engagement in lifestyle predicts an individual's cognitive functioning; while other report that an individual's cognitive functioning predicts the type and level of engagement an individual participates in. The current study will use longitudinal data (N = 235) to investigate the bidirectional relationship between engagement (engaged lifestyle activities) and cognition (crystallized & fluid intelligence). Despite inconsistent findings it is proposed that cognitive functioning may be better understood when examining how stimulation of activity, need for cognition, and openness to experience affect engagement in an active lifestyle. As such the current study will investigate if stimulation of activity, need for cognition, and openness to experience moderate the relationship between engaged lifestyles and cognitive functioning. The results, limitations and implications are discussed.
Date:
December 2016
Creator:
Abdullah, Bashir
System:
The UNT Digital Library
Saudi Male Athletes' Experience Using Mental Skills and Attitudes toward Seeking Psychological Assistance in Sport
The primary aim of this research was to assess Saudi Arabian male athletes' attitudes toward seeking sport psychology services and determine their previous experience using mental skills. As a part of the study, an Arabic version of the Sport Psychology Attitudes – Revised form (SPA-R) was developed. Transcultural translation procedures (e.g., back translation) were used to translate the SPA-R into Arabic version. Saudi male athletes (N = 222) ranging from 17 to 25 years of age with various individual and team sport experiences completed the Arabic version of SPA-R survey twice over two-weeks. Exploratory factor analysis indicated that the original theoretical structure of the phenomena existed in the version created for Arabian athletes. Follow-up analyses revealed that Saudi male athletes had high sport psychology consultant confidence and personal openness, moderately high cultural preferences, and low in stigma tolerance. Although the Arabic version of SPA-R may be useful for assessing Saudi male athletes, further research is needed with different Arab populations to verify the factor structure of the observed constructs.
Date:
May 2022
Creator:
Abdulshakur, Alhassan
System:
The UNT Digital Library
Federalism and Political Problems in Nigeria
The purpose of this thesis is to examine and re-evaluate the questions involved in federalism and political problems in Nigeria. The strategy adopted in this study is historical, The study examines past, recent, and current literature on federalism and political problems in Nigeria. Basically, the first two chapters outline the historical background and basis of Nigerian federalism and political problems. Chapters three and four consider the evolution of federalism, political problems, prospects of federalism, self-government, and attainment of complete independence on October 1, 1960. Chapters five and six deal with the activities of many groups, crises, military coups, and civil war. The conclusions and recommendations candidly argue that a decentralized federal system remains the safest way for keeping Nigeria together stably.
Date:
August 1975
Creator:
Abegunrin, Olayiwola
System:
The UNT Digital Library
Jacques-Antoine-Hippolyte, comte de Guibert: Father of the Grande Armée
The eighteenth century was a time of intense upheaval in France. The death of Louis XIV in 1715 and the subsequent reign of Louis XV saw the end of French political and martial hegemony on the continent. While French culture and language remained dominant in Europe, Louis XV's disinterested rule and military stagnation led to the disastrous defeat of the French army at the hands of Frederick the Great of Prussia in the Seven Years War (1756-1763). The battle of Rossbach marked the nadir of the French army in the Seven Years War. Frederick's army routed the French infantry that had bumbled its way into massed Prussian cavalry. Following the war, two reformist elements emerged in the army. Reformers within the government, chiefly Etienne François, duc de Choiseul, sought to rectify the army's poor performance and reconstitute France's military establishment. Outside the traditional army structure, military thinkers looked to military theory to reinvigorate the army from within and without. Foremost among the latter was a young officer named Jacques-Antoine-Hippolyte de Guibert, whose 1772 Essai général de tactique quickly became the most celebrated work of theory in European military circles. The Essai provided a new military constitution for France, proposing wholesale …
Date:
May 2011
Creator:
Abel, Jonathan, 1985-
System:
The UNT Digital Library
Rorschach Patterns as Related to Sociometric Status
The purpose of this study is to determine the relationship between an individual's performance on the Rorschach Ink Blot Test and his degree of social acceptance as revealed by a test of sociometry.
Date:
August 1955
Creator:
Aber, Walter E.
System:
The UNT Digital Library
Nature Study
A collection of poetry concerned with loss and the act of creation.
Date:
December 2021
Creator:
Abercrombie, Benjamin
System:
The UNT Digital Library
Job Opportunities and Employment Requirements for a Person Entering the Field of Electronics as a Technician in the Dallas Metropolitan Area
The problem involved in this study was twofold. The first was to ascertain what the employment requirements were for a person seeking employment in the field 6f electronics as a technician in the Dallas Metropolitan Area. The second was to determine what the job opportunities were for those individuals.
Date:
January 1965
Creator:
Abney, Horace Ray
System:
The UNT Digital Library
Source Apportionment Analysis of Measured Volatile Organic Compounds in Corpus Christi, Texas
Corpus Christi among of the largest industrialized coastal urban areas in Texas. The strategic location of the city along the Gulf of Mexico allows for many important industries and an international business to be located. The cluster of industries and businesses in the region contribute to the air pollution from emissions that are harmful to the environment and to the people living in and visiting the area. Volatile organic compounds (VOC) constitute an important class of pollutants measured in the area. The automated gas chromatography (Auto GC) data was collected from Texas Commission of Environmental Quality (TCEQ) and source apportionment analysis was conducted on this data to identify key sources of VOC affecting this study region. EPA PMF 3.0 was employed in this sources apportionment study of measured VOC concentration during 2005 - 2012 in Corpus Christi, Texas. The study identified nine optimal factors (Source) that could explain the concentration of VOC at two urbane monitoring sites in the study region. Natural gas was found to be the largest contributor of VOC in the area, followed by gasoline and vehicular exhaust. Diesel was the third highest contributor with emissions from manufacturing and combustion processes. Refineries gases and evaporative fugitive emissions …
Date:
May 2014
Creator:
Abood, Ahmed T.
System:
The UNT Digital Library
Finitness and Verb-Raising in Second Language Acquisition of French by Native Speakers of Moroccan Arabic
In this thesis, the three hypotheses on the nature of early L2 acquisition (the Full Transfer/Full Access view of Schwartz and Sprouse (e.g., 1996), the Minimal Trees view of Vainikka and Young-Scholten (e.g., 1996), and the Valueless Features view of Eubank (e.g., 1996)), are discussed. Analysis of the early French production by two native speakers of Moroccan Arabic is done to determine if the L1 grammar is transferred onto the L2 grammar. In particular, the phenomena of verb-raising (as determined by the verb's position vis-a-vis negation) and finiteness are examined. The results of this study indicate that the relevant structures of Moroccan Arabic do not transfer onto the emerging French grammar.
Date:
August 1996
Creator:
Aboutaj, Heidi H. (Heidi Huttar)
System:
The UNT Digital Library
Derivatives of 1,4-Naphthoquinone and 1,4-Anthraquinone
The purpose of this investigation was the synthesis of some 1,4-naphthoquinones and 1,4-anthraquinones. It will be shown that some of these substituted quinones exhibit physiological properties.
Date:
August 1959
Creator:
Aboytes, Peter
System:
The UNT Digital Library
Development of a Cost Effective Wireless Sensor System for Indoor Air Quality Monitoring Applications
Poor air quality can greatly affect the public health. Research studies indicate that indoor air can be more polluted than the outdoor air. An indoor air quality monitoring system will help to create an awareness of the quality of air inside which will eventually help in improving it. The objective of this research is to develop a low cost wireless sensor system for indoor air quality monitoring. The major cost reduction of the system is achieved by using low priced sensors. Interface circuits had to be designed to make these sensors more accurate. The system is capable of measuring carbon dioxide, carbon monoxide, ozone, temperature, humidity and volatile organic compounds. The prototype sensor node modules were developed. The sensor nodes were the connected together by Zigbee network. The nodes were developed in such a way that it is compact in size and wireless connection of sensor nodes enable to collect air quality data from multiple locations simultaneously. The collected data was stored in a computer. We employed linear least-square approach for the calibration of each sensor to derive a conversion formula for converting the sensor readings to engineering units. The system was tested with different pollutants and data collected was …
Date:
May 2014
Creator:
Abraham, Sherin
System:
The UNT Digital Library