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14,479
UNT Theses and Dissertations
5,559
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2,036
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1,422
Austin American-Statesman Newspaper Collection
1,142
Freie Presse für Texas
1,004
San Antonio Light
932
The Greensheet
635
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628
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216
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20,835 Matching Results
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Freie Presse für Texas. (San Antonio, Tex.), Vol. 19, No. 588, Ed. 1 Wednesday, May 7, 1884
Daily German-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
May 7, 1884
Creator:
Hanschke, Robert
Object Type:
Newspaper
System:
The Portal to Texas History
Freie Presse für Texas. (San Antonio, Tex.), Vol. 19, No. 589, Ed. 1 Thursday, May 8, 1884
Daily German-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
May 8, 1884
Creator:
Hanschke, Robert
Object Type:
Newspaper
System:
The Portal to Texas History
Freie Presse für Texas. (San Antonio, Tex.), Vol. 19, No. 590, Ed. 1 Friday, May 9, 1884
Daily German-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
May 9, 1884
Creator:
Hanschke, Robert
Object Type:
Newspaper
System:
The Portal to Texas History
Freie Presse für Texas. (San Antonio, Tex.), Vol. 19, No. 591, Ed. 1 Saturday, May 10, 1884
Daily German-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
May 10, 1884
Creator:
Hanschke, Robert
Object Type:
Newspaper
System:
The Portal to Texas History
Freie Presse für Texas. (San Antonio, Tex.), Vol. 19, No. 592, Ed. 1 Monday, May 12, 1884
Daily German-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
May 12, 1884
Creator:
Hanschke, Robert
Object Type:
Newspaper
System:
The Portal to Texas History
Freie Presse für Texas. (San Antonio, Tex.), Vol. 19, No. 583, Ed. 1 Thursday, May 1, 1884
Daily German-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
May 1, 1884
Creator:
Hanschke, Robert
Object Type:
Newspaper
System:
The Portal to Texas History
Freie Presse für Texas. (San Antonio, Tex.), Vol. 19, No. 584, Ed. 1 Friday, May 2, 1884
Daily German-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
May 2, 1884
Creator:
Hanschke, Robert
Object Type:
Newspaper
System:
The Portal to Texas History
Freie Presse für Texas. (San Antonio, Tex.), Vol. 19, No. 585, Ed. 1 Saturday, May 3, 1884
Daily German-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
May 3, 1884
Creator:
Hanschke, Robert
Object Type:
Newspaper
System:
The Portal to Texas History
Freie Presse für Texas. (San Antonio, Tex.), Vol. 19, No. 586, Ed. 1 Monday, May 5, 1884
Daily German-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
May 5, 1884
Creator:
Hanschke, Robert
Object Type:
Newspaper
System:
The Portal to Texas History
Freie Presse für Texas. (San Antonio, Tex.), Vol. 29, No. 3670, Ed. 1 Tuesday, May 1, 1894
Daily German-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
May 1, 1894
Creator:
Hanschke, Robert
Object Type:
Newspaper
System:
The Portal to Texas History
Freie Presse für Texas. (San Antonio, Tex.), Vol. 29, No. 3671, Ed. 1 Wednesday, May 2, 1894
Daily German-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
May 2, 1894
Creator:
Hanschke, Robert
Object Type:
Newspaper
System:
The Portal to Texas History
Freie Presse für Texas. (San Antonio, Tex.), Vol. 29, No. 3672, Ed. 1 Thursday, May 3, 1894
Daily German-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
May 3, 1894
Creator:
Hanschke, Robert
Object Type:
Newspaper
System:
The Portal to Texas History
An Analysis of the Effectiveness of Computer Assisted Instruction in General Chemistry at an Urban University.
The science-major General Chemistry sequence offered at the University of Houston has been investigated with respect to the effectiveness of recent incorporation of various levels of computer technology. As part of this investigation, questionnaire responses, student evaluations and grade averages and distributions from up to the last ten years have been analyzed and compared. Increased use of web-based material is both popular and effective, particularly with respect to providing extra information and supplemental questions. Instructor contact via e-mail is also well-received. Both uses of technology should be encouraged. In contrast, electronic classroom presentation is less popular. While initial use may lead to improved grades and retention, these levels decrease quickly, possibly due to a reduction in instructor spontaneity.
Date:
May 2002
Creator:
McGuffey, Angela
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Thermochemical Study of Crystalline Solutes Dissolved in Ternary Hydrogen-Bonding Solvent Mixtures
The purpose of this dissertation is to investigate the thermochemical properties of nonelectrolyte solutes dissolved in ternary solvent mixtures, and to develop mathematical expressions for predicting and describing behavior in the solvent mixtures. Forty-five ternary solvent systems were studied containing an ether (Methyl tert-butyl ether, Dibutyl ether, or 1,4-Dioxane), an alcohol (1-Propanol, 2-Propanol, 1-Butanol, 2-Butanol, or 2-Methyl-1-propanol), and an alkane (Cyclohexane, Heptane, or 2,2,4-Trimethylpentane) cosolvents. The Combined NIBS (Nearly Ideal Binary Solvent)/Redlich-Kister equation was used to assess the experimental data. The average percent deviation between predicted and observed values was less than ± 2 per cent error, documenting that this model provides a fairly accurate description of the observed solubility behavior. In addition, Mobile Order theory, the Kretschmer-Wiebe model, and the Mecke-Kempter model were extended to ternary solvent mixtures containing an alcohol (or an alkoxyalcohol) and alkane cosolvents. Expressions derived from Mobile Order theory predicted the experimental mole fraction solubility of anthracene in ternary alcohol + alkane + alkane mixtures to within ± 5.8%, in ternary alcohol + alcohol + alkane mixtures to within ± 4.0%, and in ternary alcohol + alcohol + alcohol mixtures to within ± 3.6%. In comparison, expressions derived from the Kretschmer-Wiebe model and the Mecke-Kempter …
Date:
May 2001
Creator:
Pribyla, Karen J.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Stoichiometry and Deposition Temperature Dependence of the Microstructural and Electrical Properties of Barium Strontium Titanate Thin Films
Barium Strontium Titanate (BST) was deposited on Pt/ZrO2 / SiO2/Si substrates using liquid source metal organic chemical vapor deposition. A stoichiometry series was deposited with various GrII/Ti ratios (0.658 to 1.022) and a temperature series was deposited at 550 to 700°C. The thin films were characterized using transmission electron microscopy. Both series of samples contained cubic perovskite BST and an amorphous phase. The grain size increased and the volume fraction of amorphous phase decreased with increasing deposition temperature. The electrical and microstructural properties improved as the GrII/Ti ratio approached 1 and deteriorated beyond 1. This research demonstrates that BST thin films are a strong candidate for future MOS transistor gate insulator applications.
Date:
May 1998
Creator:
Pena, Piedad
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Studies of L-Asparaginase from Lactobacillus Plantarum
This study is concerned with the regulation of Lasparaginase (LA) in the cell-free crude extracts from Lactobacillus plantarum (ATCC8014). A previously reported finding that adenosine triphosphate (ATP) inhibits the action of LA in crude extracts was confirmed. The study was extended to include the mono-, di-, and triphosphates of adenosine, guanosine, cytidine, and uridine. These compounds were also shown to inhibit LA activity. These andother studies revealed that LA appears to be an allosteric type enzyme exhibiting positive homotropism with respect to substrate and heterotropism with respect to the nucleotides tested. The regulation of LA activity by high energy compounds, when coupled with asparagine synthetaseL suggests a relationship between amide synthesis-amide degradation and the energy levels of the cell.
Date:
May 1979
Creator:
Nalepka, Edward R.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Study of the Processing Properties of Hard-Particle Reinforced Composite Solders
The microstructural, mechanical and thermal properties of various composite solder formulations were investigated. Special interest was given in observing the processing properties, microstructural characteristics, fatigue behavior, tensile strength, and the effect of environmental ageing on the composite solder formulations. The solderability parameters wetting and speed of soldering, reflow temperature, and the thermal stability of the resulting composite solder were also examined.
Date:
May 1994
Creator:
Calderon, Jose Guadalupe
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Study of Hydration of Fly Ash in the Presence of Calcium Nitrate and Calcium Formate
This research was designed to investigate the hydration reaction of fly ash when exposed to water. The effects that calcium nitrate and calcium formate have on the hydration reactions were also examined.
Date:
May 1994
Creator:
Hill, Russell L. (Russell Lee)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Synthesis of Aziridine Analogues of Pyrethroids
Rules which correlate structure and insecticidal activity of pyrethroids have evolved over the last thirty years from the results obtained in the testing of various synthetic pyrethroids. The major portion of these rules have dealt either with the development of new alcohol moieties or variations in the unsaturated side chain of the cyclopropane ring. There has been very little work done concerning modifications of the cyclopropane ring. This study was initiated to discover the affect of substituting an aziridin ring for the cyclopropane ring found in pyrethroids.
Date:
May 1981
Creator:
Sheppard, Rex Gerald
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Conformational Analysis Using Carbon-13-Carbon-13 and Carbon-13-Hydrogen Spin-Spin Coupling Constants
This study consists of four major areas of research. First, the relationship between and was extended to Lrl nil homoallylic couplings and was used to determine the relative degree of puckering in a series of dihydroaromatic carboxylic acids. Second, the effect of coupling contributions transmitted through space were examined by theoretical calculations of the intermediate neglect of differential overlap finite perturbation theory type (INDO-FPT) including selective overlap reduction experiments to determine the sign and magnitude of the major through-space contributions and the effect of the orientation of the substituent upon the vicinal carbon3 carbon coupling. Third, the dependence of the J upon substituent orientation in norbornanes was empirically investigated by the synthesis of a series of lactones and cyclic ethers whose conformation was rigid and known. Fourth, a large number of norbornanes substituted with methyls in the 1, 3, and 7 position and a carbon-13 labeled substituent in the 2 position were synthesized and studied in order to obtain a variety of vicinal C-C couplings; all the NMR parameters for this series of compounds were determined while the carbon13 labeled substituent was varied from methyl to methylene to carbinol to aldehyde and to carboxylic acid.
Date:
May 1981
Creator:
McDaniel, Cato R., Jr.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Content Originality Analysis of HRD Focused Dissertations and Published Academic Articles using TurnItIn Plagiarism Detection Software
This empirical exploratory study quantitatively analyzed content similarity indices (potential plagiarism) from a corpus consisting of 360 dissertations and 360 published articles. The population was defined using the filtering search criteria human resource development, training and development, organizational development, career development, or HRD. This study described in detail the process of collecting content similarity analysis (CSA) metadata using Turnitin software (www.turnitin.com). This researcher conducted robust descriptive statistics, a Wilcoxon signed-rank statistic between the similarity indices before and after false positives were excluded, and a multinomial logistic regression analysis to predict levels of plagiarism for the dissertations and the published articles. The corpus of dissertations had an adjusted rate of document similarity (potential plagiarism) of M = 9%, (SD = 6%) with 88.1% of the dissertations in the low level of plagiarism, 9.7% in the high and 2.2% in the excessive group. The corpus of published articles had an adjusted rate of document similarity (potential plagiarism) of M = 11%, (SD = 10%) with 79.2% of the published articles in the low level of plagiarism, 12.8% in the high and 8.1% in the excessive group. Most of the difference between the dissertations and published articles were attributed to plagiarism-of-self issues which …
Date:
May 2017
Creator:
Mayes, Robin James
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Analysis of Volatile Impurities in Air by Gas Chromatography/Mass Spectrometry
The determination of carbon monoxide is also possible by trapping CO on preconditioned molecular sieve and thermal desorption. Analysis in this case is performed by gas chromatography/mass spectroscopy, although the trapping technique is applicable to other suitable GC techniques.
Date:
May 1993
Creator:
Talasek, Robert Thomas
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Electronic Spectrum of (-)-S-(pS)-2,5,3',6'-Tetrahydro-2.2-Paracyclophane-2-Carboxylic Acid
A new, efficient route was used in the synthesis of [2.2]-paracyclophane-2-carboxylic acid. The acid as then resolved and the Birch reduction performed yielding one enantiomer of tetrahydro-[2.2]-paracyclophane-2-carboxylic acid. The ultraviolet spectrum of tetrahydro-[2.2]-paracyclophane- 2-carboxylic acid in isopenthane shows one absorption at 206 nm (Emax = 5,271). There are three bands observed in the circular dichroism spectrum in isopentane at 236 nm ([] = 1.8 X 104), 201 nm ([0] = -16 X 104) and a positive band indicated below 180 nm but not observed. The bands were assigned and possible reasons for the occurrence of a mr'r* transition at unexpectedly long wavelengths are discussed.
Date:
May 1980
Creator:
Hall, Lindsey
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Evaluation of Adsorption and Microcoulometric Methods for Determination of Halogenated Organic Compounds in Water
Two adsorption/microcoulometric methods have been investigated for total organic halogen (TOX) in water. TOX, a proposed water-quality parameter, is a rapid, surrogate method to detect halides microcoulometrically and does not require compound identification before water quality can be judged. An XAD resin is used to concentrate organic halides that are eluted by a two-step, two-solvent procedure, followed by analysis using :chromatography or pyrolysis to convert organic halides to halide. In the granular activated carbon (GAC) method, the entire GAC-organic halide sample is pyrolyzed. TOX measurements of model compounds are comparable by both methods, but GAC was found to be superior to XAD for adsorption of chlorinated humics in drinking water and chlorinated lake water.
Date:
May 1980
Creator:
Kinstley, Warren O. (Warren Owen)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library