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New Adventures in the Chemistry of Polycarboncyclic Ring Systems

New Adventures in the Chemistry of Polycarboncyclic Ring Systems

Date: December 1997
Creator: Dong, Zhiming (Eric)
Description: I. Diels-Alder reactions of 1,2,3,4,9,9-hexachloro-1,4,4a,8a-tetrahydro-1,4-metha- nonaphthalene (16) and 1,2,3,4,9,9-hexachloro-1,4,6,7-tetrahydro-1,4-methanonaphthalene (17) toward dienophiles N-methyl-1,2,4-triazoline-3,5-dione (MTAD), N-phenyl-1,2,4-triazoline-3,5-dione (PTAD) and/or N-methylmaleimide (NMM) have been examined. II. Epoxides derived from functionalized 1,4,4a,9a-tetrahydro-9,10-dioxo-1,4-methanoanthracenes (1a and 1b) undergo acid- and base-promoted intramolecular nucleophilic ring-opening to form new polycyclic alcohols. III. The title cycloalkylidenecarbene has been generated via reaction of 8-methylenepentacyclo[5.4.0.0^{2,6}.0^{3,10}. 0^{5.9}]undecan-11-one (44) with diethyl diazomethyl-phosphonate (DAMP). This species could be trapped in situ by cyclohexene, thereby affording the corresponding cycloadduct 46a and 46b.
Contributing Partner: UNT Libraries
A New Algorithm for Finding the Minimum Distance between Two Convex Hulls

A New Algorithm for Finding the Minimum Distance between Two Convex Hulls

Date: May 2009
Creator: Kaown, Dougsoo
Description: The problem of computing the minimum distance between two convex hulls has applications to many areas including robotics, computer graphics and path planning. Moreover, determining the minimum distance between two convex hulls plays a significant role in support vector machines (SVM). In this study, a new algorithm for finding the minimum distance between two convex hulls is proposed and investigated. A convergence of the algorithm is proved and applicability of the algorithm to support vector machines is demostrated. The performance of the new algorithm is compared with the performance of one of the most popular algorithms, the sequential minimal optimization (SMO) method. The new algorithm is simple to understand, easy to implement, and can be more efficient than the SMO method for many SVM problems.
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A New Approach for Transition Metal Free Magnetic Sic: Defect Induced Magnetism After Self-ion Implantation

A New Approach for Transition Metal Free Magnetic Sic: Defect Induced Magnetism After Self-ion Implantation

Date: May 2013
Creator: Kummari, Venkata Chandra Sekhar
Description: SiC has become an attractive wide bandgap semiconductor due to its unique physical and electronic properties and is widely used in high temperature, high frequency, high power and radiation resistant applications. SiC has been used as an alternative to Si in harsh environments such as in the oil industry, nuclear power systems, aeronautical, and space applications. SiC is also known for its polytypism and among them 3C-SiC, 4H-SiC and 6H-SiC are the most common polytypes used for research purposes. Among these polytypes 4H-SiC is gaining importance due to its easy commercial availability with a large bandgap of 3.26 eV at room temperature. Controlled creation of defects in materials is an approach to modify the electronic properties in a way that new functionality may result. SiC is a promising candidate for defect-induced magnetism on which spintronic devices could be developed. The defects considered are of room temperature stable vacancy types, eliminating the need for magnetic impurities, which easily diffuse at room temperature. Impurity free vacancy type defects can be created by implanting the host atoms of silicon or carbon. The implantation fluence determines the defect density, which is a critical parameter for defect induced magnetism. Therefore, we have studied the influence ...
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A New Approach to Measurement of Partial Knowledge

A New Approach to Measurement of Partial Knowledge

Date: August 1973
Creator: Wagner, David E.
Description: The problem of this study is that of developing a testing procedure for multiple-choice tests which would increase the relationship between test scores and a criterion. The procedure investigated in this research was one in which subjects took a multiple-choice test but were required to continue responding on each item until the correct answer was obtained. The total number of responses was used as the score on the test. The purpose of this research was to investigate the possibility of increasing predictability by changing the procedure of administering the test, rather than changing the test itself.
Contributing Partner: UNT Libraries
A New Approach to Teaching Grammar in the Ninth Grade

A New Approach to Teaching Grammar in the Ninth Grade

Date: June 1960
Creator: Smith, Anne Bendon
Description: By presenting first, statement of theory, and then concrete examples and original exercises, wherever practical, this thesis suggests possible ways to combine linguistic methods with traditional ones to make a more effective approach to teaching language in the ninth grade.
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A New Approach to Texas Groundwater Management: An Environmental Justice Argument to Challenge the Rule of Capture

A New Approach to Texas Groundwater Management: An Environmental Justice Argument to Challenge the Rule of Capture

Date: December 2005
Creator: Purvis, Jody
Description: Texas is the last remaining state to utilize the rule of capture, a doctrine based on English Common Law, as a means of regulating groundwater resources. Many of the western states originally used the rule of capture to regulate their groundwater resources, but over time, each of these states replaced the rule of capture with other groundwater laws and regulations. The Texas Water Development Board (TWDB) State Water Plan, Water for Texas-2002, warned Texans if current water usage and laws do not change, there will be an unmet need of 7.5 million acre-feet of water annually by 2050. This caused individuals in state and local government to begin asking the question, "How are we going to meet our future water needs?" In the search for a solution to the water shortage problem people have divided themselves into two groups: one wants to consider the implementation of water conservation measures to reduce per capita water use in order to meet future demands; while the other group wants to spend millions of dollars to build reservoirs and dams along with laying thousands of miles of pipeline to move water around the state. The fact that Texas has yet to come up with ...
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A New Chromophoric Organic Molecule Toward Improved Molecular Optoelectronic Devices

A New Chromophoric Organic Molecule Toward Improved Molecular Optoelectronic Devices

Access: Use of this item is restricted to the UNT Community.
Date: December 2012
Creator: Halbert, Jason Paul
Description: The characterization of 2,3,6,7,10,11-hexabromotriphenylene, Br6TP, is presented toward its potential use as an n-type organic semiconductor and metal-free room temperature phosphor. The crystal structure shows both anisotropic two-dimensional BrBr interactions and inter-layer ?-stacking interactions. Photophysical characteristics were evaluated using solid-state photoluminescence and diffuse reflectance spectroscopies, revealing significantly red-shifted excitations in the visible region for the yellow solid material (compared to ultraviolet absorption bands for the colorless dilute solutions). Correlation of spectral, electrochemical, and computational data suggest the presence of an n-type semiconducting behavior due to the electron-poor aromatic ring. The material shows excellent thermal stability as demonstrated by thermogravimetric analysis and infrared spectra of a thin film deposited by thermal evaporation. The potential for Br6TP and its analogues toward use in several types of photonic and electronic devices is discussed.
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A New Circle

A New Circle

Date: December 2001
Creator: Shutt, Jason
Description: This reflexive documentary film explores the Alabama-Coushatta Indian Tribe of Texas and examines questions of cultural identity. The twenty-one minute film uses footage of cultural events, reservation landscape, photographs, and interviews to bring the viewer into the lives of the Alabama-Coushatta people. The written portion of this thesis details the entire processes of making the film, from the proposal stage to the post-production stage. This includes an examination of the film's evolution from using a proposed ethnographic approach to one less scientific and more personal.
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New Concepts in Drama Education: The Drama Curriculum at the Skyline Career Development Center in Dallas, Texas

New Concepts in Drama Education: The Drama Curriculum at the Skyline Career Development Center in Dallas, Texas

Date: August 1972
Creator: Spalding, Sharon B.
Description: This thesis evaluates the Skyline drama program. The first chapter presents an overview of the program; Chapters II and III describe the core and the advanced curriculum, respectively; and Chapter IV examines the first year of operation and evaluates the entire project.
Contributing Partner: UNT Libraries
New Developments in Interior Design Curricula

New Developments in Interior Design Curricula

Date: August 1972
Creator: Maddox, Roy L.
Description: The problem with which this study is concerned is that of identifying new developments in interior design education which may have resulted from curriculum reevaluations.
Contributing Partner: UNT Libraries