Three different types of cage crown ethers have been prepared and their complexation properties with Ag(I) have been studied. Atomic absorption, fluorescence quenching, and UV absorption have been used to study the interaction between the hosts (cage crown ethers) and guests (Ag+). For the cage-annulated crown ethers that contain aromatic rings, cation-π and π-π interactions may contribute significantly to the overall complexation ability of the host system. Piperazine groups may cooperate, and the piperazine nitrogen atoms provide unshared electrons, which may form a complex with Ag+. In addition, relatively soft donor atoms (e.g., Br) are well-suited for complexation with Ag+, which is a softer Lewis acid than alkali metal cations.

The study utilized the covariance structure comparison methodology - Multigroup Analysis in Structural Equation Modeling - evaluating measurement equivalence of English and Spanish versions of an employee opinion survey. The concept of measurement equivalence was defined as consisting of four components: sample equivalence, semantic equivalence, conceptual equivalence and scalar equivalence. The results revealed that the two language versions of the survey exhibited acceptable measurement equivalence across five survey dimensions Communications, Supervision, Leadership, Job Content & Satisfaction and Company Image & Commitment. Contrary to the study second hypothesis, there was no meaningful difference in opinion scores between English-speaking and Spanish-speaking respondents on the latent construct of Job Content & Satisfaction.

This study investigated the effects of test length (10, 20 and 30 items), scoring schema (proportion of dichotomous ad polytomous scoring) and item analysis model (IRT and Rasch) on the ability estimates, test information levels and optimization criteria of mixed item format tests. Polytomous item responses to 30 items for 1000 examinees were simulated using the generalized partial-credit model and SAS software. Portions of the data were re-coded dichotomously over 11 structured proportions to create 33 sets of test responses including mixed item format tests. MULTILOG software was used to calculate the examinee ability estimates, standard errors, item and test information, reliability and fit indices. A comparison of IRT and Rasch item analysis procedures was made using SPSS software across ability estimates and standard errors of ability estimates using a 3 x 11 x 2 fixed factorial ANOVA. Effect sizes and power were reported for each procedure. Scheffe post hoc procedures were conducted on significant factos. Test information was analyzed and compared across the range of ability levels for all 66-design combinations. The results indicated that both test length and the proportion of items scored polytomously had a significant impact on the amount of test information produced by mixed item …

No Way Out: A Historical Documentary is the written companion to a forty-minute documentary film entitled "No Way Out". The film deals with a 1974 inmate standoff at a prison in Huntsville, Texas known as the Carrasco Incident. The film examines the prison takeover through the eyes of those who lived through it. Composed of five interviews, "No Way Out" is a compilation of various points of view ranging from former hostages, members of the press, and law enforcement. The written companion for this piece discusses the three phases of the production for this film. These chapters are designed to share with the reader the various intricacies of documentary filmmaking. The thesis also explores theoretical issues concerning collective memory, coping behavior, and the ethics of historical documentary filmmaking.

The purpose of this study was to explore the practices of formal and informal teacher technologists in two school settings: an elite private, high school academy and an urban poor, middle school academy. This investigation included clarifying the role of the formal and informal teacher technologist and investigating the need for both formal and informal teacher technologists. This study also explored the technological differences between the public academy middle school and the private academy high school. Two formal and eight informal teacher technologists were interviewed face-to-face three times, each using the transcendental phenomenology research design. Each teacher technologist was also observed at least once in classroom and teacher training sessions. The results of this study revealed (1) the role of the teacher technologist was a fast technology problem solver; and (2) although students and teachers used technology, the schools lagged in adequate technology and/or teacher training; (3) the teacher technologists used the Internet to build and evaluate curriculum; (4) most students used tool software centered around project-based activities; (5) teacher technologists trained other teachers to be collaborative risk-takers in using technology; (6) teacher technologists shared what they learn with students and other teachers; and (7) students could be student-learners or …

Handheld computers may hold the possibility for a one-to-one computer: student ratio. The impact of the use of Palm® (Palm, Inc.) handhelds on information acquisition and use by 5th grade students in a North Texas school during a class research project was investigated. Five research questions were examined using observation, interviews, surveys, and document analysis. Are there differences in information gathering and use with the Palm between gifted, dyslexic, and regular learners? What relevance criteria do students use to evaluate a web site to determine whether to download the site to the Palm and afterwards whether to use the downloaded site's information in the report? How do the Palms affect the writing process? Do the animations and concept maps produced on the Palm demonstrate understanding of the intended concepts? Are there significant differences in results (i.e., final products grade) between Palm users and non-Palm users? Three groups of learners in the class, gifted, dyslexic, and regular learners, participated in the study. The regular and dyslexic students reported using Web sites that had not been downloaded to the Palm. Students reported several factors used to decide whether to download Web sites, but the predominant deciding factor was the amount of information. …

Automatic memory management is crucial in implementation of runtime systems even though it induces a significant computational overhead. In this thesis I explore the use of statistical properties of the directed graph describing the set of live data to decide between garbage collection and heap expansion in a memory management algorithm combining the dynamic array represented heaps with a mark and sweep garbage collector to enhance its performance. The sampling method predicting the density and the distribution of useful data is implemented as a partial marking algorithm. The algorithm randomly marks the nodes of the directed graph representing the live data at different depths with a variable probability factor p. Using the information gathered by the partial marking algorithm in the current step and the knowledge gathered in the previous iterations, the proposed empirical formula predicts with reasonable accuracy the density of live nodes on the heap, to decide between garbage collection and heap expansion. The resulting heuristics are tested empirically and shown to improve overall execution performance significantly in the context of the Jinni Prolog compiler's runtime system.

The focus of the study is on financial reporting for non-U.S. firms registered with the Securities Exchange Commission (SEC) but using International Accounting Standards (IAS). This study addresses two issues, (1) whether the comparability of financial reporting among firms using IAS in credit and equity financing jurisdictions increases over time and (2) the associated capital market implications. The motivation for the study is the SEC's ongoing assessment of IAS for possible use by non-U.S. registrants for listing and capital raising in the U.S. Previous research on variations in financial reporting practices has revealed distinctly different types of financial reporting depending on country of origin. Moreover, some research suggests that such differences in financial reporting tend to persist in spite of harmonization efforts of accounting standards. This study suggests that there may be a systematic difference between credit and equity firms' financial reporting that is manifested by the fact that credit firms' adjustments to U.S. GAAP are greater than the adjustments made by equity firms. This systematic difference has had the following capital market consequences for credit firms, (1) a decreasing strength of association between accounting earnings and share prices post-1994, (2) an increased bid-ask spread post-1994, and (3) a decreased …

This work is an exploration into the palindrome, both as a literary form and an expression of infinity. The first two chapters address the fascinating manner in which the mind contextualizes fragments of speech and ludicrous grammatical implications that are spawned by the poetic structure of the palindrome (third chapter). The thesis then departs from the literary aspect of the palindrome and focuses in the fourth chapter on structural likenesses in psychology and mythology. The fifth chapter argues the palindrome and parallel conceptual structures as examples of recursion, then presents examples of recursion in language/grammar, art, and computer science. The sixth chapter uses instances of the recursive equiangular spiral throughout nature to introduce recursion and therefore the palindrome as an archetypal expression of infinity. The thesis ends with a list of the author's palindromes.

The purpose of this study was to examine the effects frequenting the street had on the social-emotional development of children in Cuenca, Ecuador. While the study sought to discover who these children were, it primarily observed the levels of trust these children felt in the various contexts of their lives, their level of safety, where they saw themselves in the future, what made a place feel like a home, their sense of self-esteem, and how they saw themselves contributing to their future. The research instrument used in this study was a modified youth questionnaire previously developed by Tyler and Tyler (1991) in a study with street children/youth in Bogóta, Colombia. The results are presented in 11 case studies of children who ranged in age between 7 and 12 years.

The medium of language is important to environmental philosophy, and more specifically, to the establishment and understanding of environmental relationships. The differences between animal and human language point to our unique semantic range, which results from our neuro-linguistic process of signification. An examination of the linguistic implications of the problem of nature and the tenets of semiotics challenges the idea of a clean word to world fit. Because signs are the medium in which meaning is constructed, questions about nature must in part be questions of language. Environmental discourse itself is bound up in sociolinguistic productions and we must attend not only to what language says, but to what it does. NEPA functions as a speech act that systematically invokes an ethical framework by which it colonizes the domain of valuation and fails to provide a genuine opportunity for non-commodity values to be expressed.

Through this body of work and this paper the possibilities of using Fashion Design to express the concepts of the circle has been explored. This was done with three questions in mind: How can I use the shape of the circle as inspiration for fashion design? How can I express related words and phrases in my design? and How can I use the colors black and white to emphasize the concept of my design. To answer these questions I have created two groups of garments: one was inspired by circular objects, such as cherries and drops, and the other starting from words and phrases such as "study circle" and "circle the wagons." In the first group the emphasis was on the aesthetics of the garment while the second group was more focused on meaning. All garments are black and white.

This study examined the experience of 140 students in a counselor training program that required students to participate in 10 sessions of individual counseling during their training program in order to increase their self-awareness. Students had the option of fulfilling the requirement through being counseled either by more advanced students within the training program or by mental health professionals outside the program. Results indicated that students in both settings reported a significant increase in their self-awareness. Students who fulfilled the requirement in a setting outside of the counseling program clinics reported a significantly higher increase in self-awareness than those who fulfilled the requirement within the counseling program clinics. Students' reports of increased self-awareness did not vary by their stages of progress through the program. Participants reported significant ethical concerns regarding confidentiality and dual relationships that reportedly reduced the beneficial impact of the counseling experience. Students who fulfilled the counseling requirement within the counseling program clinics experienced significantly greater ethical concerns than did those who fulfilled the requirement outside the program clinics. As with effect on self-awareness, stage in the program was not related to impact of ethical concerns on the required counseling experience. The overwhelming majority (91.4%) of participants supported …

The kinetics of the pressure dependent O + SO2 + Ar reaction have been investigated using laser photolysis resonance fluorescence at temperatures of 289 K, 399 K, 581 K, 699 K, 842 K and 1040 K and at pressures from 30-665 torr. Falloff was observed for the first time in the pressure dependence. Application of Lindemann theory yielded an Arrhenius expression of k(T) = 3.3 x 10-32exp(-992/T) cm6 molecule-1 s-1 for the low pressure limit and k(T) = 8.47 x 10-14exp(-468/T) cm3 molecule-1 s-1 for the high pressure limit at temperatures between 289 and 842 K. The reaction is unusual as it possesses a positive activation energy at low temperature, yet at higher temperatures the activation energy is negative, illustrating a reaction barrier.

The Lewisville Lake Environmental Learning Area (LLELA) is a wildlife management area with tallgrass prairie, an endangered ecosystem. Essential ecosystem processes, especially fire, are part of restoration. To support fire management efforts at LLELA and surrounding areas, this project evaluated and developed tools for fire restoration. The four primary prairie grasses respond favorably to burning. Fuel loads and fuel models vary by scale and survey method. One- and 10-hour fuel moisture can be predicted using a statistical model; 100- and 1,000-hour fuel moisture cannot. Historic weather data suggests that burning can occur when it is most effective. The production of ozone precursors produced by burning is comparable to those emitted every six minutes by regional automobiles.

Teacher attrition is a problem with a number of implications, not the least of which is the teacher shortage. Almost half of all new teachers leave the profession within the first five years, creating a difficult model where more teachers leave the teaching profession compared to teachers entering the profession. Part of the problem is a result of career progression. However, most of teacher attrition is a result of factors such as inadequate pay, administrative support, workplace conditions, student related issues, and collegiality with peers. Without a thorough understanding of the factors that contribute to teacher attrition it is impossible to create an environment where "No Child is Left Behind". Although teachers do not enter the profession with the notion of getting rich, they do need to make enough money to support themselves and their families. Furthermore, professional status in America is closely tied to socioeconomic status. Therefore, while salary may be the largest component of teacher attrition, school and district characteristics, teacher qualifications, and demographics also affect a teacher's decision to leave the profession.

The impact of training on virtual team effectiveness was assessed in five areas: communication, planning tasks and setting goals, solving problems and making decisions, resolving conflict, and responding to customer requirements. A 12-page survey was developed exploring all aspects of virtual teams. 180 surveys were distributed, 52 were returned representing 43 companies. Training led to higher effectiveness in planning tasks and setting goals, solving problems and making decisions, and conflict resolution, but not in communication and responding to customer requirements. Training may not solve all the problems that virtual teams will encounter; however, training will make the challenges easier to handle.

This written thesis accompanies a 32-minute documentary video, Journey for Jazz, which explores four Korean students who major in jazz at the University of North Texas in Denton. Detailed accounts of the pre-production, production, and post-production of the video guide the reader to understand the challenging and rewarding process of making this documentary. Theoretical issues are also discussed, including Bill Nichols's typology of documentary modes as a useful tool for analysis of hybrid documentaries and conventions of the observational and interactive mode in Journey for Jazz, which is considered a hybrid of both modes. The film focuses mainly on the scholarly and artistic experiences that the four students undergo while studying jazz in the United States.

The fractal operators discussed in this dissertation are introduced in the form originally proposed in an earlier book of the candidate, which proves to be very convenient for physicists, due to its heuristic and intuitive nature. This dissertation proves that these fractal operators are the most convenient tools to address a number of problems in condensed matter, in accordance with the point of view of many other authors, and with the earlier book of the candidate. The microscopic foundation of the fractal calculus on the basis of either classical or quantum mechanics is still unknown, and the second part of this dissertation aims at this important task. This dissertation proves that the adoption of a master equation approach, and so of probabilistic as well as dynamical argument yields a satisfactory solution of the problem, as shown in a work by the candidate already published. At the same time, this dissertation shows that the foundation of Levy statistics is compatible with ordinary statistical mechanics and thermodynamics. The problem of the connection with the Kolmogorov-Sinai entropy is a delicate problem that, however, can be successfully solved. The derivation from a microscopic Liouville-like approach based on densities, however, is shown to be impossible. …

This research project was inspired by a survey that was designed to help an organization determine how well it was doing in its efforts to empower associates and achieve a goal of continuous improvement. Initial review of the survey created suspicion that the survey was not built around the appropriate dimensions to accurately measure the level of empowerment in organizations. As such, the survey was psychometrically analyzed to determine the validity of the instrument as a measure of empowerment. Additionally, an extensive review of the literature was performed to determine new dimensions that would most accurately measure empowerment. Eight dimensions (culture, trust, accountability, leadership, ability, commitment, responsibility, and communication) were put forth as the most appropriate to measure empowerment. Subject matter experts with knowledge and experience in the area of organizational empowerment reviewed the new dimensions for accuracy and fit with the original survey items.

The purpose of this study was to evaluate the effects of a computer program on the training and maintenance of diaphragmatic breathing. The biofeedback portion was visual computer training and the results were displayed concurrently with participants' breathing responses to monitor display. The verbal feedback portion was praise that was given and recorded when participants responded with predominantly diaphragmatic breathing at the scheduled moment and response instruction that was given when participants responded with predominantly thoracic breathing. The results of this study indicate the computer program's effectiveness needs to be increased by supplementation with verbal feedback.

Content-based image retrieval (CBIR) is the retrieval of images from a collection by means of internal feature measures of the information content of the images. In CBIR systems, text media is usually used only to retrieve exemplar images for further searching by image feature content. This research work describes a new method for integrating multimedia text and image content features to increase the retrieval performance of the system. I am exploring the content-based features of an image extracted from a video to build a storyboard for search retrieval of images. Metadata encoded multimedia features include extracting primitive features like color, shape and text from an image. Histograms are built for all the features extracted and stored in a database. Images are searched based on comparing these histogram values of the extracted image with the stored values. These histogram values are used for extraction of keyframes from a collection of images parsed from a video file. Individual shots of images are extracted from a video clip and run through processes that extract the features and build the histogram values. A keyframe extraction algorithm is run to get the keyframes from the collection of images to build a storyboard of images. In …

The widely used vector model maintains its popularity because of its simplicity, fast speed, and the appeal of using spatial proximity for semantic proximity. However, this model faces a disadvantage that is associated with the vagueness from keywords overlapping. Efforts have been made to improve the vector model. The research on improving document representation has been focused on four areas, namely, statistical co-occurrence of related items, forming term phrases, grouping of related words, and representing the content of documents. In this thesis, we propose the idea-indexing model to improve document representation for the filtering task in IR. The idea-indexing model matches document terms with the ideas they express and indexes the document with these ideas. This indexing scheme represents the document with its semantics instead of sets of independent terms. We show in this thesis that indexing with ideas leads to better performance.

The problem of establishing the correct approach to complexity is a very hot and crucial issue to which this dissertation gives some contributions. This dissertation considers two main possibilities, one, advocated by Tsallis and co-workers, setting the foundation of complexity on a generalized, non-extensive , form of thermodynamics, and another, proposed by the UNT Center for Nonlinear Science, on complexity as a new condition that, for physical systems, would be equivalent to a state of matter intermediate between dynamics and thermodynamics. In the first part of this dissertation, the concept of Kolmogorov-Sinai entropy is introduced. The Pesin theorem is generalized in the formalism of Tsallis non-extensive thermodynamics. This generalized form of Pesin theorem is used in the study of two major classes of problems, whose prototypes are given by the Manneville and the logistic map respectively. The results of these studies convince us that the approach to complexity must be made along lines different from those of the non-extensive thermodynamics. We have been convinced that the Lévy walk can be used as a prototype model of complexity, as a condition of balance between order and randomness that yields new phenomena such as aging, and multifractality. We reach the conclusions that …