Digital Commons Network^™

Leaching Characteristics Of Inorganic Contaminants From Coal Fly Ash, Tingzhi Su

Doctoral Dissertations

"Leaching of trace elements raises environmental concerns in coal fly ash disposal and reuse. US EPA is in the process of creating the first national rule on coal ash management. However, due to the complexity of coal fly ash composition, the leaching characteristics of trace elements are not well understood. Meanwhile, driven by the tightening emission regulations, new types of coal fly ashes are continuously generated as a result of the technological evolution at coal energy industry. The changing landscape highlights the needs for a comprehensive database to assess the leaching characteristics of different types of coal fly ashes, evaluation …

Preliminary Model Development Of Metal Complexation Of Polyester Derivatives Of 2,2'-Biimidazole, Shelonda Rena Taylor Finch

Doctoral Dissertations

"The objective of this study was to develop a chemical model for metal ion complex formation by a macroligand system with multi-metal binding sites using 2,2'-biimidazole as the starting molecule of the ligand system. Prior studies in this laboratory guided the selection of diesters and hydroxyethyl derivatives of 2,2'-biimidazole as model monomers. In addition, metal ion complexation studies with 2,2'-biimidazole derivatives were conducted. As a result, crystal structures of 1,1'-di(methylpropionato)-2,2-biimidazole, 2,2'-bis(1H-imidazolium) dinitrate and silver 2,2'-bis(1H-imidazolium) trinitrate, were reported. The crystal structures indicated a dependence upon the binding ability of the protonated 2,2'-biimidazole and counter ions. transesterification of the diesters and …

Processing And Characterization Of Boron Carbide-Hafnium Diboride Ceramics, Harlan J. Brown-Shaklee

Doctoral Dissertations

"Hafnium diboride based ceramics are promising candidate materials for advanced aerospace and nuclear reactor components. The effectiveness of boron carbide and carbon as HfB₂ sintering additives was systematically evaluated. In the first stage of the research, boron carbide and carbon additives were found to improve the densification behavior of milled HfB₂ powder in part by removing oxides at the HfB₂ surface during processing. Boron carbide additives reduced the hot pressing temperature of HfB₂ by 150⁰C compared to carbon, which reduced the hot pressing temperature by ~50⁰C. Reduction of oxide impurities alone could not explain the difference in sintering enhancement, however, …

Surface Modification Of Micro-Fluidic Devices, Zhan Gao

Doctoral Dissertations

"The surface modification, fabrication and characterization of microfluidic sensor systems for oxygen and glucose measurements with the use of polymeric materials were investigated in this dissertation. This dissertation is prepared in publication format. The first manuscript focuses on the surface modification of SU -8 layer to enhance the wettability. The improvement of wettability is critical since biofouling can be minimized during bioanalysis. A novel in situ photopattemable grafting technology was used to attach biocompatible polymer layers on SU-8 surface, changing its property from hydrophobicity to hydrophilicity. The results were confirmed by contact angle measurement and Fourier Transform Infrared (FTIR) spectra. …

The Black Poor, Black Elites, And America's Prisons, James Forman Jr.

Cardozo Law Review

No abstract provided.

Racial Redistricting In A Post-Racial World, Gilda R. Daniels

Cardozo Law Review

The 2011 redistricting will provide some interesting challenges for minority voting rights. How can we preserve minority electoral opportunities and gains in the wake of Bartlett v. Strickland and Georgia v. Ashcroft? What is the impact on future voting rights litigation and are coalition district claims viable as an opportunity to continue the electoral gains made since the passage of the Voting Rights Act? Are majority-minority districts safe from legislative backsliding? The Supreme Court's construed admonitions against race-conscious redistricting in recent cases may become cautionary tales. This Article discusses the central role the Voting Rights Act should play in …

One Pot Synthesis Of Metal, Carbides And Polymeric Aerogels, Naveen K. Chandrasekaran

Doctoral Dissertations

"Ultra-low density, three-dimensional assemblies of nanoparticles are referred to as aerogels, and typically are derived from supercritical fluid (SCF) drying of wet-gels. Aerogels are generally fragile materials, but that issue has been addressed successfully by X-aerogels, in which the inorganic nanoparticle framework plays the role of the template for the accumulation of polymer that connects covalently and crosslinks the nanoparticles. The resulting materials can be 300x stronger than the native network, for a nominal increase in density by a factor of 3x. Since the exceptional mechanical properties of X-aerogels are traced to the conformal polymer coating, it was reasonable to …

Modeling Hourly Electricity Prices: A Structural Time Series Approach Incorporating Modified Garch Innovations, Edirisinghe Mudiyanselage Asitha Edirisinghe

Doctoral Dissertations

"The main objective of this research is to develop time series based procedures for modeling day-ahead and real-time hourly electricity prices. Such empirical processes exhibit features that make the direct application of standard time series models infeasible. Four years of hourly day-ahead and real-time electricity price data from the region supplied by the American Electric Power (AEP) company through the PJM Regional Transmission Organization (RTO) and one half years of real-time electricity prices from the MISO RTO are utilized as an empirical basis for developing such procedures. The price data show several features, such as irregular seasonal behavior, weekly and …

Multiple Differential Study Of Fragmentation Processes In 75 Kev Proton-Molecular Hydrogen Collisions, Kisra Nayomal Egodapitiya

Doctoral Dissertations

"Double Differential Cross Sections (DDCS) were measured for single ionization of H₂ by 75 keV proton (p) impact as a function of the projectile scattering angle (θp) for a fixed energy loss (ΔE) for two different target-collimating slit distances, which determined the width of the projectile wave packet (Δx). In one case Δx was larger than the inter-nuclear separation of the H₂ molecule (coherent projectile beam), while for the other case it was much smaller than the inter-nuclear separation (incoherent projectile beam). A Young type interference pattern was observed in the coherent data, but this was not present in the …

Crustal Structure And Evolution Beneath The Colorado Plateau And The Southern Basin And Range Province, Lamuail Bashir

Doctoral Dissertations

"Stacking of about 15,500 P-to-S receiver functions recorded at 72 USArray and other broadband seismic stations placed on the Colorado Plateau and the SBRP in Arizona revealed systematic spatial variations in crustal Vp/Vs, crustal thickness and amplitude of P-to-S converted phases. Our results reveal that the BRP is characterized by a thin crust (28.2 ± 0.5 km), a mean Vp/Vs of 1.761 ± 0.014 and a mean amplitude (R) of P - to - S converted wave (relative to that of the direct P wave) of 0.181 ± 0.014 that are similar to a typical continental crust, consistent with the …

Additivity Of Strengthening Mechanisms In Ultrafine Grained Aluminum Alloy, Nilesh Kumar

Doctoral Dissertations

"Friction stir processing (FSP) has been used in the present work to obtain ultrafine grained (UFG) microstructure in a twin-roll cast (TRC) Al-Mg-Sc alloy. An attempt has been made to establish a correlation between processing, microstructure, and properties (mechanical) in UFG regime for this alloy system.

The effect of initial microstructural conditions and processing parameters (tool rotation rate) were shown to have a profound impact on the development of UFG microstructure. FSP led to a microstructure consisting of grains with an average grain size as small as 390 nm, having high angle grain boundaries and a completely random texture. The …

Naturalistic Emotional Speech Corpora With Large Scale Emotional Dimension Ratings, Brian Vaughan

Doctoral

The investigation of the emotional dimensions of speech is dependent on large sets of reliable data. Existing work has been carried out on the creation of emotional speech corpora and the acoustic analysis of emotional speech and this research seeks to build
upon this work while suggesting new methods and areas of potential. A review of the literature determined that a two dimensional emotional model of activation and evaluation was the ideal method for representing the emotional states expressed in
speech. Two case studies were carried out to investigate methods of obtaining natural
underlying emotional speech in a high quality …

Characterisation Of Metallo-Cyclodextrins For Chiral Separations, Gary Hessman

Doctoral

Almost half of commercial pharmaceuticals are chiral and therefore effective analytical techniques to detect and quantify enantiomers are important in the pharmaceutical sector to ensure drug safety and efficacy. In this work copper(II) complexes of aminoalkane derivatives of β-cyclodextrin (CDEn, CDPn and CDBn) were investigated to determine if they provide a versatile solution for the direct separation of the enantiomers of DOPA, benserazide and carbidopa using capillary electrophoresis. Tyrosine was used as a model compound. Electronic spectroscopy was used in order to determine if copper(II) coordinates to the amino-CDs and to determine if further coordination to the guest species occurs. …

Hall-Effect Thruster Surface Properties Investigation, David George Zidar

Masters Theses

"Surface properties of Hall-effect thruster channel walls play an important role in the performance and lifetime of the device. Physical models of near-wall effects are beginning to be incorporated into thruster simulations, and these models must account for evolution of channel surface properties due to thruster operation. Results from this study show differences in boron nitride channel surface properties from beginning-of-life and after 100's of hours of operation. Two worn thruster channels of different boron nitride grades are compared with their corresponding pristine and shadow-shielded samples. Pristine HP grade boron nitride surface roughness is 9000±700 Å, while the worn sample …

Inalienable Possessions And Flyin' West: African American Women In The Pioneer West, Justin Hosbey

USF Tampa Graduate Theses and Dissertations

Nicodemus, Kansas is one of the few remaining settlements founded by African American former slaves in the post-Civil War period of American history. Designated by the National Park Service as a National Historic Site in 1996, Nicodemus has secured its role as a place deemed important to the history of America. For this project, I worked as an intern for the Nicodemus Historical Society, under the direction of Angela Bates. This local heritage preservation agency manages archival and genealogical records important to Nicodemus descendants, and exhibits several of the community's cultural and material artifacts for the public. I was specifically …

Fantasy, Leisure, And Labor: A Story Of Temple Terrace's Historic Architecture, Rachelle Hostetler

USF Tampa Graduate Theses and Dissertations

The purpose of this project is to explore how the community planning and style of housing of Temple Terrace Estates embodies the socio-economic conflicts inherent to the United States in the 1920s. To account for missing narratives, I will approach this research from a critical cultural perspective. I chose this approach as a way to investigate the power dynamics in the city during the time it was known as Temple Terrace Estates Inc. The Estates attracted investors by encouraging northerners to purchase a Mediterranean Revival or Spanish Colonial style villa in conjunction with a parcel of a large orange grove, …

A Comparison Of Ecological Conditions And Relationships In An Altered Wetland And An Unaltered Wetland, Mark Kiyoshi Hurst

USF Tampa Graduate Theses and Dissertations

The purpose of the study is to identify and quantify the hydrologic and ecologic differences between two adjacent sections of Colt Creek; one section unaltered and one section altered by clearing and drainage. These differences were measured by monitoring water levels, groundcover vegetation in each of the two areas, and monitoring numbers and species of birds utilizing the two areas. Surface water levels were measured in three locations: in the historic Colt Creek flow way, in the ditch draining the creek, and in an adjacent wetland strand. In addition, a shallow monitor well in the creek was used to measure …

Evaluating Knowledge And Attitudes Of Graduate Nursing Students Regarding Pain, Eric Bartholomew Jackson

USF Tampa Graduate Theses and Dissertations

Insufficient pain management continues to be problematic for hospitalized patients throughout the country. It significantly interferes with a person's quality of life making it an issue of great concern to nurses in any setting. However, nurses do not do a good job of managing pain. The purpose of this evaluation was to assess graduate nursing students' knowledge and attitudes toward pain management.

Forty (n=40) graduate nursing students were asked to participate in the evaluation. All students agreed and completed the Demographic Data Form, Nurses Attitude Survey and the Pain Management and Principles Assessment. Thirty-eight females and two males participated in …

Growth And Characterization Of Thermoelectric Ba8Ga16Ge30 Type-I Clathrate Thin-Films Deposited By Pulsed Dual-Laser Ablation, Robert Harry Hyde

USF Tampa Graduate Theses and Dissertations

The on-going interest in thermoelectric (TE) materials, in the form of bulk and films, motivates investigation of materials that exhibit low thermal conductivity and good electrical conductivity. Such materials are phonon-glass electron-crystals (PGEC), and the multi-component type-I clathrate Ba₈Ga₁₆Ge₃₀ is in this category. This work reports the first investigation of Ba₈Ga₁₆Ge₃₀ films grown by pulsed laser deposition (PLD).

This dissertation details the in-situ growth of polycrystalline type-I clathrate Ba₈Ga₁₆Ge₃₀ thin-films by pulsed laser ablation. Films deposited using conventional laser ablation produced films that contained a …

Case-Control Study Of Sunlight Exposure And Cutaneous Human Papillomavirus Seroreactivity In Basal Cell And Squamous Cell Carcinomas Of The Skin, Michelle R. Iannacone

USF Tampa Graduate Theses and Dissertations

Non-melanoma skin cancer (NMSC), comprised of basal cell carcinoma (BCC) and squamous cell carcinoma (SCC), is the most common cancer in Caucasians. Ultraviolet radiation (UVR) exposure is the most important environmental risk factor for both BCC and SCC development. However, the precise relationship between UVR and the risk of NMSC is complex, and the relationship may differ by skin cancer type. It has been hypothesized that intermittent patterns and childhood sunlight exposure are important for BCC while continuous (chronic) and lifelong (i.e. childhood and adulthood) sunlight exposure is important for SCC. Epidemiologic studies have demonstrated that cutaneous human papillomavirus (HPV) …

The Conservation And Ecology Of Carnivorous Plants, David Jennings

USF Tampa Graduate Theses and Dissertations

As discussed in Chapter 1, although our understanding of the ecology and evolution of carnivorous plants has greatly improved in recent years, many fundamental questions remain unanswered. Unfortunately, at the present time, many carnivorous plants are increasingly threatened by anthropogenic activities. Indeed, over half of the carnivorous plant species assessed by the International Union for the Conservation of Nature (IUCN) are listed as `threatened', but the threats to carnivorous plants have not previously been quantified. In Chapter 2, I quantified the conservation threats to carnivorous plant taxa worldwide by searching peer-reviewed literature, and found data on the threats to 48 …

"Take Another Look At 'Em": Passing Performances Of Gender In The Junior-Freshman Weddings Of Florida State College For Women, 1909-1925, Sarah Lynne Jünke

USF Tampa Graduate Theses and Dissertations

Junior-freshmen weddings were all-female mock weddings that were performed as annual traditions on college campuses throughout the U.S. in the early part of the twentieth-century. In the weddings, college women played both the men's and women's roles, and were joined as husband and wife by their college administration. This thesis focuses on the junior-freshman weddings of Florida State College for Women during the years 1909-1925 and argues that the weddings expressed the conflicted cultural contexts that college women in the Progressive Era confronted, but that, significantly, this expression was done through passing performances of gender. The women's choice of passing …

Oxygen Diffusion Characterization Of Frp Composites Used In Concrete Repair And Rehabilitation, Chandra K. Khoe

USF Tampa Graduate Theses and Dissertations

Many independent studies have conclusively demonstrated that fiber reinforced polymers (FRP) slow down chloride-induced corrosion of steel in concrete. The mechanism for this slow down is not well understood but it has been hypothesized that FRP serves as a barrier to the ingress of chloride, moisture, and oxygen that sustain electrochemical corrosion of steel.

This dissertation presents results from an experimental study that determined the oxygen permeation rates of materials used in infrastructure repair. In the study, the oxygen permeation constants for epoxy, carbon and glass fiber laminates, concrete, epoxy-concrete and FRP-concrete systems were determined and a method developed to …

An Analysis On The Experience Of Mentoring Support In A College Alternative Teacher Certification Program, Debra Voutsinas Kilgore

USF Tampa Graduate Theses and Dissertations

The purpose of this research study was to explore how college alternative teacher certification (ATC) participants experience mentoring support. The goal was to obtain a rich and deep understanding of the nature of the mentoring experience in a college ATC program through the perspectives of mentees and their mentors. The ATC program was the Educator Preparation Institute (EPI).

Semi-structured interviews were conducted. Eight individuals participated in the study, four were mentors and four were EPI students. A triangulated set of research methods for data collection and analysis was used, including member checks, validation forms, and peer reviews. All the interviews …

Teacher Commitment To The Implementation Of Ninth Grade Academies And Their Perceptions Of School Leadership, Deborah Kindel

USF Tampa Graduate Theses and Dissertations

This study examined the commitment of teachers to the implementation of ninth grade academies and their perceptions of school leadership during the reform process. Concern for successful high school completion prompted the redesign of ninth grade into a school-within-a-school format within a Florida school district. Therefore, the purpose of this study was to determine the type of commitment and form of leadership evident in this reform initiative along with the relationship between them. As a mindset for change, commitment was represented as affective, normative, and continuance. Leadership styles were delineated as transformational, transactional, and passive/avoidant along with related outcomes of …

How To Get From Here To There: Poetic Connections In Tracy Letts's "Man From Nebraska," "August: Osage County," And "Superior Donuts.", Deborah Ann Kochman

USF Tampa Graduate Theses and Dissertations

In this thesis, Kochman examines the textual references to poetry in contemporary playwright Tracy Letts's "Man from Nebraska," "August: Osage County," and "Superior Donuts" and explores how specific references function as a "poetic exchange" between the protagonists and the respective agents of change or moral touchstones in each play and how these "poetic exchanges" suggest a diminishment or elevation of the intrinsic value of art -- specifically, poetry -- as a force for personal and cultural renewal. While Letts's writing is hardly "poetic" and his structure closer to "narrative," he focuses on "the repressed" - both emotionally and socially --and …

Assessing The Relationship Of Monocytes With Primary And Secondary Dengue Infection Among Hospitalized Dengue Patients In Malaysia, 2010: A Cross-Sectional Study, Benjamin Glenn Klekamp

USF Tampa Graduate Theses and Dissertations

Dengue, a group of four similar viruses transmitted through the bite of a mosquito, is estimated to infect upwards of 100 million annually in over 100 nations throughout the global equatorial belt. Distribution of global dengue is highly skewed as Southeast Asian and Western Pacific regions endure 75% of the global dengue burden. Similar to other regional countries, Malaysia has been rapidly urbanizing, which has supported a hyperendemic dengue state.

The biological pathway by which dengue infection causes a wide range of clinical manifestations, spanning asymptomatic to life-threatening severe complications, is not comprehensively understood. Historically, severe dengue complications have primarily …

Talking With Als Patients: An Exploratory Study Of Patient Attitudes Toward Mass Messages About Als, Kamden Kuhn

USF Tampa Graduate Theses and Dissertations

This study examines the attitudes and opinions of ALS patients toward mass messages about their condition. Six focus groups of ALS patient support groups viewed and responded to public relations messages, charity advertisements, and a news story. Results suggest that mass messages remind participants of the need for public ALS awareness. Participants also said they shared in the narratives and identify closely with the characters in the messages they viewed, and participants expressed concern with disease depictions. These concerns included a tension between positive and realistic portrayals, identification of message inaccuracies, and a desire for more specific disease information. The …

Gender Differences In Lung Cancer Treatment And Survival, Margaret Anne Kowski

USF Tampa Graduate Theses and Dissertations

The objectives of this research were to test treatment and survival differences between women and men with lung cancer as there is minimal investigation in the literature. Three research questions were developed with statistical testing for gender differences based on similar cancer type, stage, treatment assignment and survival. Data for 44,863 primary lung cancer cases were collected from eight U.S. state-based cancer registries to investigate the research questions. The lung cancer incidence data included the morphological cell-types of adenocarcinoma (AC); squamous cell carcinoma (SCC); large cell carcinoma (LCC) and small cell carcinoma (SCC). Stage, grade, treatment type, as well as, …

The Jewish Trail Of Tears The Evian Conference Of July 1938, Dennis Ross Laffer

USF Tampa Graduate Theses and Dissertations

The purpose of this thesis was to explore the origins, formulation, course and outcome of the Intergovernmental Committee for Political Refugees meeting (better known as the Evian Conference) of July 1938. Special emphasis was placed on contemporary and later historical assessments of this assembly which represented the first international cooperative attempt to solve an acute refugee crisis. A general review followed by a more detailed evaluation was made of existing official and un-official accounts of the meeting utilizing both public records, private diaries, books, newspapers, journals and other periodicals for the period of January 1, 1938 through December 31, 1939. …