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1,945 Matching Results
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The Effects of Color Concentrate in Polyolefins.
Access:
Use of this item is restricted to the UNT Community
Throughout history consumer products were generally manufactured from wood and metal. They either had to hold their natural color or become subject to painting. When plastics entered the industry, it was recognized for its ease of shaping, re-usability, physical properties and its low cost. One of plastics' greatest benefits is its ability to hold a given color from within allowing it to avoid use of paint. This paper will give a brief overview on the effects of pigments when incorporated in a polyolefin. It will provide a classification of the main types of pigments and how each effect the properties of the product through: crystallization, weatherability, opacity, coloristic values and of course viscosity.
Date:
December 2001
Creator:
Flora, Paul
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Microwave Cavity Test for Superconductivity
Access:
Use of this item is restricted to the UNT Community
The first part of this paper describes the Meissner effect in superconductors which serves as the most definitive evidence for superconductivity. It is shown that the microwave perturbation technique may be used to demonstrate this effect. By measuring the changes of resonant frequency and inverse quality factor Q of a microwave cavity with a small volume of sample loading, the Meissner effect can be shown by using the Slater perturbation equation. The experimental system is described with details and the basic principle of each component discussed. The second part of this work describes the technique employed to do the actual measurements. The experiments were conducted on samples of Gallium Arsenide (GaAs) and lead zirconate titanate (PZT) to look for the possible high temperature superconductivity properties. Results of these experiments are presented and discussed. Conclusion and suggestions to future exploration are made.
Date:
December 2001
Creator:
Tang, Shan
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Signs and Cases
Abstract not available
Date:
December 2001
Creator:
Whitmire, James
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Techniques Utilized in the Characterization of Existing Materials for Improved Material Development
It has become increasingly important to remain on the cutting edge of technology for a company to remain competitive and survive in today's high-tech industries. To do this, a company needs various resources dedicated to this cause. One of these resources is the use of existing materials, as starting points, for which improved materials can be based. For this, a company must rely on the characterization of existing materials to bring that base technology into their company. Through this evaluation, the base materials properties can be obtained and a material with improved properties can be developed. There are many techniques that can be used in characterizing an existing material, but not every technique is required to obtain the desired goal. The techniques utilized depend upon the depth of identification required. This report summarizes several techniques utilized in the characterization of existing materials and provides some examples of evaluated products.
Date:
December 2001
Creator:
Withaeger, Gary
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Enallagma civile (Odonata: Coengrionidae) life history and production in a west Texas playa
A life history and productivity study of Enallagma civile was conducted in a playa that was located in the southern High Plains of Texas. Other odonates were also studies to identify their contributions to the habitat.
Date:
May 2002
Creator:
Booker, Jennifer Suzanne
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Viewers' Choice
This paper documents the execution and exhibition of a group of oil paintings exploring themes of spectacle and the construction of reality in contemporary American society. The paintings are composed of figures and fragments of text originating in stills taken from television news and reality TV. This paper describes and assesses the paintings according to a set of questions developed by the artist at the inception of the project. Various strategies employed in the execution of the work are analyzed and compared. The contribution of this project to the field of contemporary visual art is evaluated via comparison with other art, past and present, expressing similar concerns.
Date:
May 2002
Creator:
Brownlee, Tracie
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A study of stock price reactions to the decisions of the Federal Open Market Committee (FOMC) on changes in the federal funds rate.
This paper analyzes stock index reactions to interest rate actions by the FOMC. Unlike previous analyses this study utilizes macro-economic indicators and accounts for pre-decision market expectations. Results indicate significant reaction of the stock market to the actions of the FOMC regardless of interest rate actions matching pre-decision market expectations. Binary dummy variables representing the five days following an FOMC meeting indicate a significant reaction for days one; two and three of the Dow Jones model and for day five of the NASDAQ model. The magnitude of the coefficients are 0.17%, 0.09%, -0.07% and -.15% respectively. These findings may be sensitive to a priori choices regarding the definition of the market expectation variable.
Date:
May 2002
Creator:
Bushnell, Wesley
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Replacing the Horse
I have been working with horses as imagery for about seven years and my problem in lieu of thesis continued along this vein by researching the roles of the horse in history, specifically mobility, and developing work that creates visual links between the past and present roles of horses. I am a printmaker and the work involved in the project consists of prints that use layers of related images and juxtaposition of unrelated images to accomplish my goals of cohesion between horses and the machinery that has replaced them. As the project developed the links between past and present society became my impetus rather the horse and mobility, and my future work will respond to this.
Date:
May 2002
Creator:
Ebert, Matthew J.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Social Intercourse
This thesis explains the stories and concepts behind each piece that was discussed on the opening night of my MFA Exhibition. The works, entitled Film Noir, Brains, Trains, and Beer, The Boy Next Door, Peterbuilt, and 10-50, H-1, was discussed more specifically and in greater detail. Speaking in public has always been a difficult task, especially on the subject of my art. My images deal with the highly intense subject matter of violence inflicted onto others as a result of human social behaviors. These vile social behaviors are translated into colorful and humorous lithographs, etchings, and drawings. These images are displayed to the public for individual interpretation. This thesis discusses audience interpretation before the literal meaning is revealed, how much information should be revealed to the viewer, and how this information manipulates the aesthetics of the piece.
Date:
May 2002
Creator:
Greco, Paul
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Theoretical Study of Second Harmonic Generation of a Blue Laser at 486 nm Using a BBO Crystal in a Standing Wave Buildup Cavity
For a spectroscopy purpose, we are interested in producing continuous wave (CW) UV laser light at 243 nm with at least 2 mW power. The theory of nonlinear optics suggests that we should be able to produce a desired 2.9 mW of 243 nm light by second harmonic generation (SHG) from a 50 mW blue laser at 486 nm using a BBO crystal in a build up cavity. The most important physical parameters are calculated. A 10 mm Brewster cut BBO crystal can provide phase matching conditions for coupling two ordinary photons at 486 nm and make a secondary beam at 243 nm. The single pass conversion efficiency is calculated not to be enough to generate 2.9 mW of SH light. My investigation shows that a standing wave build up cavity can provide a buildup factor of 94 and an overall conversion efficiency of 5.9% if one use an input coupler mirror with 1.1% transmission at 486 nm.
Date:
May 2002
Creator:
Khademian, Ali
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Distant Proximity: Mapping Presence and Absence
Chapter I presents my background as an artist born and raised in Romania, and describes my artwork in connection with my interests and experiences. Maps and traditional Romanian art are important sources of influence. The questions in the statement of problem deal with the way ideas, references to various elements, and installation impact the artwork. Chapter II discusses the installation at the Dallas Visual Art Center, the creative process, and how the artwork addressed the questions in the statement of problem. Important points are: a step into three-dimensionality with the tall, freestanding pieces painted on both sides, the use of topographical contours in creating shapes, issues of form and content as expressed in the painted surfaces, and the interaction of the individual works in the installation.
Date:
May 2002
Creator:
Mitroi, Tudor
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Bioreactor Landfill Cell Feasibility Study ' Reference to City of Denton Subtitle-D Permit #1590A Landfill
The City of Denton Landfill, Permit #1590A, utilizes “Dry-Tomb” techniques for disposal and promotion of municipal solid waste stabilization, as described by the Resource Conservation and Recovery Act (RCRA) prohibition in 40 CFR. Bioreactor research suggests re-circulating leachate increases biodegradation rates and reduces long-term monitoring from fifty years to less than ten years. Current procedures that are followed at Denton's landfill, literature review and the use of the Hydrologic Evaluation of Landfill Performance (HELP) model, suggest that a bioreactor landfill cell is worthy of further research. Re-circulating leachate and augmenting it with additional liquid will increase biodegradation and the need to design and build a landfill gas collection system to capture methane for energy recovery uses.
Date:
May 2002
Creator:
Roberts, Elizabeth
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Loss of Innocence
Loss of Innocence uses sculpture, two-dimensional imagery, and text to explore the moment when children lose their innocence or realize their mortality. In the introduction, I explain that there are many factors, such as age and personality, which determine how children will deal with traumatic events in their lives and the duration of time that must pass before they move past the event. Often, children will combine childhood fantasy with random facts to create their own satisfactory explanation of what has happened. In my problem in lieu of thesis, I discuss work that I created with these thoughts in mind. I explore how the sculpture, two-dimensional imagery, and text work together to convey the emotion of innocence lost.
Date:
May 2002
Creator:
Smith, Jennifer J.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Surfacing the Void
Surfacing the Void is an exploration of surface design in relationship to the topic of voids. For the purpose of this paper, two types of void were addressed: shelters and hulls. The theme behind the sculptural works dealt with negative spaces as an analogy for the voids in people's lives. The goal was to find a way for the surfaces to elicit an emotional response from the viewer that correlates to the impression of either shelter or hull. Keeping this in mind, each experiment was approached with how to best represent the meaning of void being manifested. Imagery was applied during different states of the clay: wet, dry, and fired. Methods of exploration included texturing, drawing, stenciling, stamping, incising, decoupage and covering the surfaces with textiles.
Date:
May 2002
Creator:
Williamson, Melanie L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Are the Needs of North Dakota's Aging Population with Developmental Disabilities Being Overlooked?
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Use of this item is restricted to the UNT Community
North Dakota is faced with the challenge of meeting the needs of its growing population of elderly persons aging with a developmental disability. The challenge of creating new service models presents itself to professionals in the fields of Aging and Developmental Disabilities. Traditionally, the aging person with a developmental disability has been sent to nursing homes or grouped into community programs with younger persons with developmental disability. North Dakota is looking toward the future of caring for this special population through integration with elderly without disabilities.
Date:
May 2002
Creator:
Clark, Amy Klein
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Approach to Quantum Information starting from Bell's Inequality (Part I) and Statistical Analysis of Time Series Corresponding to Complex Processes (Part II)
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Use of this item is restricted to the UNT Community
I: Quantum information obeys laws that subtly extend those governing classical information, making possible novel effect such as cryptography and quantum computation. Quantum computations are extremely sensitive to disruption by interaction of the computer with its environment, but this problem can be overcome by recently developed quantum versions of classical error-correcting codes and fault-tolerant circuits. Based on these ideas, the purpose of this paper is to provide an approach to quantum information by analyzing and demonstrating Bell's inequality and by discussing the problems related to decoherence and error-correcting. II: The growing need for a better understanding of complex processes has stimulated the development of new and more advanced data analysis techniques. The purpose of this research was to investigate some of the already existing techniques (Hurst's rescaled range and relative dispersion analysis), to develop a software able to process time series with these techniques, and to get familiar with the theory of diffusion processes.
Date:
May 2002
Creator:
Failla, Roberto
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Application of the Finite Element Method to Some Simple Systems in One and Two Dimensions.
The finite element method (FEM) is reviewed and applied to the one-dimensional eigensystems of the isotropic harmonic oscillator, finite well, infinite well and radial hydrogen atom, and the two-dimensional eigensystems of the isotropic harmonic oscillator and the propagational modes of sound in a rectangular cavity. Computer codes that I developed were introduced and utilized to find accurate results for the FEM eigensolutions. One of the computer codes was modified and applied to the one-dimensional unbound quantum mechanical system of a square barrier potential and also provided accurate results.
Date:
May 2002
Creator:
Hunnell, Jason C.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Issues of Interpersonal Bonds
Access:
Use of this item is restricted to the UNT Community
In this work, sections of bodies are joined with sections of other people's bodies in order to form a new whole. Adding or subtracting relationships can many times be uncomfortable and strange, which I depict in my invented individuals based on the phases of family, such as birth, death, marriage, divorce, and the acquisition of new forms of family. This work questions issues of the family in terms of its definition, whether biologically or culturally constructed. I am creating hybrids by separating body parts from the whole and then recombining them to form a new individual. These images are a result of thinking about the possibilities and changes that people go through as a result of the new growth or loss of relationships. This work is intended to bring awareness to the way in which people relate and families become more blended.
Date:
May 2002
Creator:
Morin, Tesa B.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Control Mechanisms and Recovery Techniques for Real-Time Data Transmission Over the Internet.
Streaming multimedia content with UDP has become popular over distributed systems such as an Internet. This may encounter many losses due to dropped packets or late arrivals at destination since UDP can only provide best effort delivery. Even UDP doesn't have any self-recovery mechanism from congestion collapse or bursty loss to inform sender of the data to adjust future transmission rate of data like in TCP. So there is a need to incorporate various control schemes like forward error control, interleaving, and congestion control and error concealment into real-time transmission to prevent from effect of losses. Loss can be repaired by retransmission if roundtrip delay is allowed, otherwise error concealment techniques will be used based on the type and amount of loss. This paper implements the interleaving technique with packet spacing of varying interleaver block size for protecting real-time data from loss and its effect during transformation across the Internet. The packets are interleaved and maintain some time gap between two consecutive packets before being transmitted into the Internet. Thus loss of packets can be reduced from congestion and preventing loss of consecutive packets of information when a burst of several packets are lost. Several experiments have been conducted with …
Date:
August 2002
Creator:
Battula, Venkata Krishna Rao
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The impact of rising energy prices on the poor over time in the United States.
Policy makers and households are concerned about the impact of rising energy prices on low-income households. In a trend starting in the 1970s, low-income households are spending an increasingly disproportionate share of their income on home energy. The burden on a household imposed by energy prices can be analyzed through four factors: energy price, energy consumption, income level, and level of assistance provided to help with the costs of energy. The combination of these factors indicates that the energy burden is continuing to be disproportionately large for the nation's poor. Therefore, policy makers make further efforts to alleviate this burden by modifying energy pricing regulation.
Date:
August 2002
Creator:
Long, Pei-Ling Amy
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Sequence without Uniformity
The inspiration for my undergraduate body of work is derived from my fascination with Henri Matisse, Jacob Lawrence, and the Impressionists. I suddenly became captivated with the Impressionist movement and the independence of abstraction. I set into motion a series of paintings and drawings featuring random African-Americans and African society representatives in vibrant color and abstracting forms, and was specifically concerned with altering the form outside of the realistic area. While in graduate school, I began to think about how the transformation from realism to abstraction combined with the conception of mortal to the immortal. I worked through ideas to see exactly where these views began, and where they would take me as an artist. Almost immediately I experimented with random figures found specifically in the N'debele culture in South Africa. In addition, I incorporated abstraction and expressive marks within the figure and slowly introduced cut paper, flat imagery and abstraction with the realistic figure. This became very challenging but I was determined to unite these ideas successfully. More recently, my work has concentrated on the essential elements that have influenced my work as an artist, which recedes to childhood. The main elements most prevalent within the work is rhythm …
Date:
August 2002
Creator:
Woodford, Nicole Yvonne
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Developing a Test Bed for Interactive Narrative in Virtual Environments
Access:
Use of this item is restricted to the UNT Community
As Virtual Environments (VE) become a more commonly used method of interaction and presentation, supporting users as they navigate and interact with scenarios presented in VE will be a significant issue. A key step in understanding the needs of users in these situations will be observing them perform representative tasks in a fully developed environment. In this paper, we describe the development of a test bed for interactive narrative in a virtual environment. The test bed was specifically developed to present multiple, simultaneous sequences of events (scenarios or narratives) and to support user navigation through these scenarios. These capabilities will support the development of multiple users testing scenarios, allowing us to study and better understand the needs of users of narrative VEs.
Date:
August 2002
Creator:
Mellacheruvu, Krishna
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Fabrication of MOS capacitor and transitor structure using contact photolithography.
Access:
Use of this item is restricted to the UNT Community
This problem in lieu of thesis report describes a practical photolithographic method to produce micro patterns on metal-oxide-semiconductor or metal-oxide-semiconductor-metal layers for electrical measurements. The desired patterns are then transferred from the photo mask to the photoresist-coated metal film by exposure, followed by wet etching. In the procedure described in this report, it was observed that microstructures as small as 27 mm with an edge roughness of ~ 2 mm can be reproducibly generated with this process. MOS capacitors and transistors structures can be fabricated by using this technique. The method described in this report requires access to only simple facilities so that it is relatively inexpensive, and the overall time required for the whole process is short.
Date:
August 2002
Creator:
Su, Danni
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Implementation of Scalable Secure Multicasting
Access:
Use of this item is restricted to the UNT Community
A large number of applications like multi-player games, video conferencing, chat groups and network management are presently based on multicast communication. As the group communication model is being deployed for mainstream use, it is critical to provide security mechanisms that facilitate confidentiality, authenticity and integrity in group communications. Providing security in multicast communication requires addressing the problem of scalability in group key distribution. Scalability is a concern in group communication due to group membership dynamics. Joining and leaving of members requires the distribution of a new session key to all the existing members of the group. The two approaches to key management namely centralized and distributed approaches are reviewed. A hybrid solution is then provided, which represents a improved scalable and robust approach for a secure multicast framework. This framework then is implemented in an example application of a multicast news service.
Date:
August 2002
Creator:
Vellanki, Ramakrishnaprasad
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library