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 Collection: UNT Theses and Dissertations
Solicitor Success: The Continuing Exploration of the Determinants of Governmental Success at the Supreme Court, 1986-2005

Solicitor Success: The Continuing Exploration of the Determinants of Governmental Success at the Supreme Court, 1986-2005

Date: August 2007
Creator: Grubbs, Kevin
Description: Studies of the Supreme Court consistently show that the Office of the Solicitor General enjoys remarkable success before the Supreme Court, both at the certiorari stage and at the merits stage. These studies offer a variety of explanations for Solicitor General success, but fail to portray accurately the Office of the Solicitor General and to account for variations in governmental success. This paper seeks to continue the exploration of governmental success. By looking at the Office of the Solicitor General as a series of individuals with distinct characteristics rather than as a single entity, and by accounting for various situational dynamics, I attempt to explain the variations in executive success.
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Characterization of Novel Solvents and Absorbents for Chemical Separations

Characterization of Novel Solvents and Absorbents for Chemical Separations

Date: May 2011
Creator: Grubbs, Laura Michelle Sprunger
Description: Predictive methods have been employed to characterize chemical separation mediums including solvents and absorbents. These studies included creating Abraham solvation parameter models for room-temperature ionic liquids (RTILs) utilizing novel ion-specific and group contribution methodologies, polydimethyl siloxane (PDMS) utilizing standard methodology, and the micelles cetyltrimethylammonium bromide (CTAB) and sodium dodecylsulfate (SDS) utilizing a combined experimental setup methodology with indicator variables. These predictive models allows for the characterization of both standard and new chemicals for use in chemical separations including gas chromatography (GC), solid phase microextraction (SPME), and micellar electrokinetic chromatography (MEKC). Gas-to-RTIL and water-to-RTIL predictive models were created with a standard deviation of 0.112 and 0.139 log units, respectively, for the ion-specific model and with a standard deviation of 0.155 and 0.177 log units, respectively, for the group contribution fragment method. Enthalpy of solvation for solutes dissolved into ionic liquids predictive models were created with ion-specific coefficients to within standard deviations of 1.7 kJ/mol. These models allow for the characterization of studied ionic liquids as well as prediction of solute-solvent properties of previously unstudied ionic liquids. Predictive models were created for the logarithm of solute's gas-to-fiber sorption and water-to-fiber sorption coefficient for polydimethyl siloxane for wet and dry conditions. These models ...
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Induction of Visible Mutations in Mormoniella by Use of Low Frequency Ultrasonic Energy

Induction of Visible Mutations in Mormoniella by Use of Low Frequency Ultrasonic Energy

Date: August 1972
Creator: Grubbs, Steven C.
Description: Low-frequency ultrasonic energy was utilized in an attempt to induce visible mutations in the parasitoid wasp Mormoniella vitripennis. This study demonstrates that low frequency ultrasound may be used as an effective mutagenic agent in this organism, and suggests that it may have applications to other genetic systems.
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The Role and Contributions of Independent Sales Representatives in the Relationship Between Merchandise Suppliers and Small Retailers: Dynamic Interactions in the Channel

The Role and Contributions of Independent Sales Representatives in the Relationship Between Merchandise Suppliers and Small Retailers: Dynamic Interactions in the Channel

Date: May 1998
Creator: Gruben, Kathleen H. (Kathleen Hall)
Description: Small retailers are searching for a basis of competitive advantage to compete against larger retailers. The independent sales representative (rep) may represent such a basis. Little is known about how the role of reps and their performance is perceived by suppliers and retailers. We do not know what is expected from reps, if the reps' performance meets suppliers and retailers expectations, or whether met expectations lead to a basis of competitive advantage. Primarily, the study was designed to identify the role and contributions reps in the interactions between the supplier and retailer in the channel of distribution.
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The Effects of Different Percentages of Incentive Pay to Base Pay on Work Productivity

The Effects of Different Percentages of Incentive Pay to Base Pay on Work Productivity

Date: December 1992
Creator: Gruenberg, Joel S.
Description: None
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Electrostatic Effects in III-V Semiconductor Based Metal-optical Nanostructures

Electrostatic Effects in III-V Semiconductor Based Metal-optical Nanostructures

Access: Use of this item is restricted to the UNT Community.
Date: May 2012
Creator: Gryczynski, Karol Grzegorz
Description: The modification of the band edge or emission energy of semiconductor quantum well light emitters due to image charge induced phenomenon is an emerging field of study. This effect observed in quantum well light emitters is critical for all metal-optics based light emitters including plasmonics, or nanometallic electrode based light emitters. This dissertation presents, for the first time, a systematic study of the image charge effect on semiconductor–metal systems. the necessity of introducing the image charge interactions is demonstrated by experiments and mathematical methods for semiconductor-metal image charge interactions are introduced and developed.
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Opioid/Adrenergic Interaction in Regulating Canine Cardiac Function

Opioid/Adrenergic Interaction in Regulating Canine Cardiac Function

Date: May 1990
Creator: Gu, Hong
Description: Opioid/adrenergic interactions were studied to evaluate two hypotheses: (1) naloxone potentiates the effect of epinephrine on cardiac contractility by increasing circulating epinephrine concentrations; and (2) endogenous and exogenous opioids alter left cardiac nerve stimulationinduced norepinephrine release and cardiac function. A canine isolated heart-lung preparation was used for the first study. Plasma epinephrine was determined and myocardial epinephrine uptake was calculated during intravenous epinephrine infusion. Naloxone (4 mg) was given and the epinephrine infusion was repeated. Naloxone increased cardiac contractility, coronary blood flow, and the coronary sinus epinephrine concentration. When coronary blood flow was subsequently held constant (100% above resting), naloxone increased only contractility. This result indicated that the previously observed increase in coronary sinus epinephrine was flow dependent. Corticosterone (an uptake II blocker) was employed as a positive control. Corticosterone increased the contractile response to epinephrine, but unlike naloxone, corticosterone was accompanied by a clear decrease in myocardial epinephrine uptake. The stereospecificity of the response to naloxone was investigated and (+) naloxone equaled or exceeded (-) naloxone in potentiating the inotropic effect of epinephrine. In the second study, the left cardiac nerve was isolated and electrically stimulated in intact dogs. Norepinephrine overflow gradually declined during successive control stimulations. Pretreatment with ...
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Ternary Oxide Structures for High Temperature Lubrication

Ternary Oxide Structures for High Temperature Lubrication

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Date: August 2015
Creator: Gu, Jingjing
Description: In this research, a temperature dependent tribological investigation of selected ternary oxides was undertaken. Based on the promising results of previous studies on silver based ternary oxides, copper based ternary oxides were selected to conduct a comparative study since both copper and silver are located in the same group in the periodic table of the elements. Two methods were used to create ternary oxides: (i) solid chemical synthesis to create powders and (ii) sputtering to produce thin films. X-ray diffraction was used to explore the evolution of phases, chemical properties, and structural properties of the coatings before and after tribotesting. Scanning electron microscopy, Auger scanning nanoprobe spectroscopy, and X-ray photoelectron spectroscopy were used to investigate the chemical and morphological properties of these materials after sliding tests. These techniques revealed that chameleon coatings of copper ternary oxides produce a friction coefficient of 0.23 when wear tested at 430 °C. The low friction is due to the formation of copper tantalate phase and copper in the coatings. All sputtering coatings showed similar tribological properties up to 430 °C.
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Intramolecular [2+2] Cycloadditions of Phenoxyketenes and Intermolecular [2+2] Cycloadditions of Aminoketenes

Intramolecular [2+2] Cycloadditions of Phenoxyketenes and Intermolecular [2+2] Cycloadditions of Aminoketenes

Date: May 1989
Creator: Gu, Yi Qi
Description: One objective of this study was to explore the intramolecular [2+2] cycloadditions of phenoxyketenes to carbonyl groups with isoflavones and benzofurans as target compounds. The other objective was to investigate the eyeloaddition reactions of rarely studied aminoketenes. The conversion of 2-(carboxyalkoxy)benzils to the corresponding phenoxyketenes leads to an intramolecular [2+2] cycloaddition to ultimately yield isoflavones and/or 3-aroylbenzofurans. The product distributions are dependent upon the substitution pattern in the original benzil acids. The initial cycloaddition products, β-lactones, are isolated in some instances while some β-lactones spontaneously underwent decarboxylation and could not be isolated. The ketene intermediate was demonstrated in the intramolecular reaction of benzil acids or ketoacids with sodium acetate and acetic anhydride. It is suggested that sodium acetate and acetic anhydride could serve as a source for the generation of ketenes directly from certain organic acids. The treatment of ketoacids with acetic anhydride and sodium acetate provides a simpler procedure to prepare benzofurans than going through the acid chloride with subsequent triethylamine dehydrochlorination to give the ketenes. N-Ary1-N-alkylaminoketenes were prepared for the first time from the corresponding glycine derivatives by using p-toluenesulfonyl chloride and triethylamine. These aminoketenes underwent in situ cycloadditions with cyclopentadiene, cycloheptene and cyclooctenes to yield only the ...
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WiFi Networks through Directional Antenna: An Experimental Study

WiFi Networks through Directional Antenna: An Experimental Study

Date: May 2015
Creator: Gu, Yixin
Description: In situations where information infrastructure is destroyed or not available, on-demand information infrastructure is pivotal for the success of rescue missions. In this paper, a drone-carried on demand information infrastructure for long-distance WiFi transmission system is developed. It can be used in the areas including emergency response, public event, and battlefield. The WiFi network can be connected to the Internet to extend WiFi access to areas where WiFi and other Internet infrastructures are not available. In order to establish a local area network to propagate WIFI service, directional antennas and wireless routers are used to create it. Due to unstable working condition on the flying drones, a precise heading turning stage is designed to maintain the two directional antennas facing to each other. Even if external interferences change the heading of the drones, the stages will automatically rotate back to where it should be to offset the bias. Also, to maintain the same flying altitude, a ground controller is designed to measure the height of the drones so that the directional antennas can communicate to each other successfully. To verify the design of the whole system, quite a few field experiments were performed. Experiments results indicates the design is reliable, ...
Contributing Partner: UNT Libraries