Digital Commons Network^™

Investigation Of Antimonide Structure Types And The Structural Studies Of Molybdates, Dixie Plaisance Gautreaux

LSU Doctoral Dissertations

This dissertation highlights the investigation of ternary lanthanide antimonide structure types and their physical properties. In particular, these ternary phases allow for the systematic investigation of the structure in an effort to correlate structure and properties. The ternary antimonides are layered structures with two-dimensional square sheets or nets, which influence the properties of these materials. In an effort to determine how structural changes influence the physical properties, various single crystals of compounds relating to the orthorhombic CeNiSb3 structure have been grown and characterized. The layered CeNiSb3 structure consists of Sb sheets, NiSb6 distorted octahedra, and CeSb9 monocapped square anti-prisms. LnNi(Sn,Sb)3 …

Synthesis And Surface Characterization Of Silica-Polypeptide Composite Particles, Erick Isael Soto-Cantu

LSU Doctoral Dissertations

The synthesis and sequential surface characterization of silica-polypeptide composite particles is described. Nearly monodisperse colloidal silica cores were obtained by the alkaline hydrolysis of tetraethyl orthosilicate (TEOS). The hydrodynamic radius can be easily controlled in the range of ƒî 20-140 nm by the water/TEOS ratio in the starting reaction mixture. The surface of the synthesized silica cores was further passivated/functionalized (P/F) by a mixture of (3-aminopropyl) trimethoxysilane (APS) and methyl-trimethoxysilane (MTMS). The amino groups were quantified using UV-Vis spectrometry after reaction with ninhydrin. The use of zeta potential measurements of the P/F silica particles at low pH is presented as …

Genetic Analysis Of The Boundary Element Associated Factors-Beaf32a And Beaf-32b, Swarnava Roy

LSU Doctoral Dissertations

Insulators are DNA elements that have been shown to restrict the communication between enhancers and promoters in transgenic assays. In my PhD work I have attempted to highlight the function and importance of insulators by using the Boundary Element Associated Factors- BEAF -32A and BEAF-32B as model insulator binding proteins. We generated a null BEAFAB-KO allele and BEAFA-KO allele by using homologous recombination method. BEAF-32B was found to be sufficient to obtain viable flies. Our results show that BEAF is required for both oogenesis and development. Position independent expression and enhancer-blocking assays showed that BEAF confers insulator function to scs’ …

Genetic And Mechanistic Analysis Of Heterochromatin Spreading In The Yeast S.Cerevisiae, Nithya Jambunathan

LSU Doctoral Dissertations

RNA Polymerase III transcribed tRNA genes are implicated in a wide variety of chromosome organizational functions that includes the ability to act as a boundary to heterochromatic silencing. A tRNA gene has been shown to be a major component of the barrier that prevents spreading of silencing from the HMR locus to the downstream GIT1 gene on chromosome III in S.cerevisiae. Our results suggest that additional proteins are involved in maintaining the boundary function of this tRNA gene. Mutations or deletions of the genes coding for these additional proteins have been shown to either weaken the boundary or enhance silencing. …

Continuous Reservoir Model Updating By Ensemble Kalman Filter On Grid Computing Architectures, Xin Li

LSU Doctoral Dissertations

A reservoir engineering Grid computing toolkit, ResGrid and its extensions, were developed and applied to designed reservoir simulation studies and continuous reservoir model updating. The toolkit provides reservoir engineers with high performance computing capacity to complete their projects without requiring them to delve into Grid resource heterogeneity, security certification, or network protocols.

Continuous and real-time reservoir model updating is an important component of closed-loop model-based reservoir management. The method must rapidly and continuously update reservoir models by assimilating production data, so that the performance predictions and the associated uncertainty are up-to-date for optimization. The ensemble Kalman filter (EnKF), a Bayesian …

Exercise And Peripheral Vascular Function In Health And Disease, Arturo Arce

LSU Doctoral Dissertations

“Chronic disease will never reach its clinical horizon to compromise health if it is attacked at its origin” [1]. Knowledge that one’s risk for cardiovascular events is related to the severity of endothelial dysfunction, and evidence that exercise training can improve endothelial function, has prompted speculation that measures of vascular function may serve as a “barometer” for cardiovascular health. This dissertation consists of three experiments intended to study vascular function and the manner in which it may influence or may be influenced by physical function. Project one examined the influence of high and low volume circuit weight training on forearm …

Redutive Dehalogenation Of Chlorinated Alkanes By Novel Bacteria At The Petroprocessor Of Louisiana Inc. Superfund Site, Jun Yan

LSU Doctoral Dissertations

A reductively dehalogenating enrichment culture was established using chloroalkane-contaminated groundwater from the PetroProcessors of Louisiana, Inc. (PPI) Superfund site. Two novel, strictly anaerobic bacterial strains, designated as BL-DC-8 and BL-DC-9, were isolated from the enrichment culture. These strains represent the first bacteria known to anaerobically dehalogenate 1,2,3-trichloropropane, the degradation pathway of which was determined. Both strains could be cultured in completely defined basal medium and were also able to dehalogenate a variety of other vicinally chlorinated alkanes including 1,1,2,2-tetrachloroethane, 1,1,2-trichloroethane, 1,2-dichloroethane, and 1,2-dichloropropane via dichloroelimination reactions. Chlorinated alkanes containing only a single chlorine substituent (1-chloropropane, 2-chloropropane), chlorinated alkenes (tetrachloroethene, trichloroethene, …

From The Mountains To The Podium: The Rhetoric Of Fidel Castro, Brent C. Kice

LSU Doctoral Dissertations

This dissertation examines the rhetoric utilized by Fidel Castro that Castro used in order to maintain his tenure as the sole leader of Cuba for almost 50 years. Castro employs identification through division with an enemy, and he is able to perpetuate this division through an ongoing, dynamically perceived narrative. This narrative takes shape in the form of “the revolution,” a rhetorical construction designed to create a collective Cuban identity, which, in turn, is furthered through ideology by Castro’s elimination of competing points of views. Castro’s unique role as narrator has allowed him to adapt to events and maintain this …

Processes And/Of Performance: Difference, Memory, And Experimentation, Benjamin Daniel Powell

LSU Doctoral Dissertations

This study enacts performance analyses by combining experimental and avant-garde performance practices of artists or art movements such as John Cage, Jerzy Grotowski, Dadaism, and Eugenio Barba with the differential philosophies of Jacques Derrida and Gilles Deleuze. By focusing on the ways that performance practice informs understandings of “the ghost” and différance in Derrida’s theories, and processes of production and experimentation in Deleuze’s, this study examines performance as a process of negotiating practice and theory that continues to produce rather than disappear. To reinforce the productive capacity of performance, this study looks at three different sites and the processes at …

New Media In New Democracies: Perceptions Of Good Governance Among Traditional And Internet-Based Media Users In Kyrgyzstan, Svetlana Viktorovna Kulikova

LSU Doctoral Dissertations

This dissertation explores the potential and role of the Internet-based media in the Kyrgyz Republic’s political processes after the 2005 March Revolution. It uses a model of interaction between the government and citizens through various types of realities: the reality constructed and imposed by the state-controlled media, the reality created by alternative, independent sources of information online, and the realities experienced by citizens in their daily lives. The model pulled together various theories from political science, sociology, psychology, and mass communication and focused on the exit-voice-loyalty options available for the citizens in response to governance practices. The research project uses …

Latino Representation In U.S. Legislatures: Interests, Behavior, And Influence, Stella M. Rouse

LSU Doctoral Dissertations

Despite the growth of Latinos in the general population and in legislatures, their impact on the political process has received little scholarly attention. In this project, I present a theoretical framework of Latino legislative behavior that draws upon two important concepts of representation- descriptive and substantive- to better understand how ethnicity influences legislative activity and whether it is dependent on such factors as institutional context, legislative composition, and constituency characteristics. The project is unique in its comprehensive analysis of the legislative process and in its mixed methodological approach which includes both quantitative and qualitative elements. The analysis involves five parts: …

Louis Aragon And Pierre Drieu La Rochelle: Servility And Subversion, Oana Carmina Cimpean

LSU Doctoral Dissertations

This dissertation addresses the use of literature in support of political ideologies, starting from the cases of Louis Aragon and Pierre Drieu La Rochelle. Aragon and Drieu wrote extensively about man’s alienation in the modern world and, more importantly, about the possibility of overcoming that alienation. Both argued for the creation of a new man who could erect a new world on the ruins of the old. Though Aragon was a communist and Drieu a fascist, they shared an apocalyptic view of the world and believed themselves to be living in the last stage of history, the prelude to a …

Landscape Analysis Of Vegetation Change In Coastal Louisiana Following Hurricanes Katrina And Rita, Gregory Dean Steyer

LSU Doctoral Dissertations

Investigations of hurricane disturbances on coastal vegetated communities are common, but relatively few are comprehensive across broad geographic regions. The 2005 hurricanes, Katrina and Rita, exposed Louisiana coastal landscapes to physical modifications and extensive and prolonged flooding, resulting in measurable physicochemical changes. This research used remote sensing and field investigations to regionally assess (1) porewater salinity and sulfide impacts to and recovery of coastal Louisiana vegetation communities, and (2) the importance of mineral sediment deposition on accretionary processes. Hurricane effects were most direct and prominent in eastern Louisiana from Katrina and western Louisiana from Rita, compared to central Louisiana exposed …

Adsorption And Photochemical Transformation Of Polycyclic Aromatic Hydrocarbons On Atmospheric Water Films, Jing Chen

LSU Doctoral Dissertations

Atmospheric water films affect the processing of chemicals in the atmosphere and have potential effects on human health and the environment. In this work, adsorption and photochemical transformations of gas-phase PAHs were studied in a flow-tube photo-reactor with a view to understanding the behavior of gas-phase PAHs occurring in thin water films such as those of aerosols and fog. Naphthalene and phenanthrene were chosen as model PAHs for this study. Bulk water-air and air-to-interface partition constants of naphthalene and phenanthrene were estimated from the experiments based on the dependence of the equilibrium uptake on the water film thickness. Theoretical computations …

Catalytic Synthesis Of Ethanol From Biomass-Derived Syngas, Adefemi Adelanwa Egbebi

LSU Doctoral Dissertations

Syngas produced by gasification of biomass or coal can be converted directly to ethanol and higher alcohols by processes based on heterogeneous catalysts. Ethanol can be used as a neat fuel or fuel additive or as a hydrogen carrier. Rhodium-based catalysts have been found to be most selective for the formation of C₂ oxygenates from the hydrogenation of CO when suitably promoted. Here, we explore the effects of Mn, Fe, and Li promoters on Rh/TiO₂. Rh-TiO₂, Rh-Li/TiO₂, Rh-Mn/TiO₂, Rh-Mn-Li/TiO₂ and Rh-Mn-Li-Fe/TiO₂ catalysts were tested for the hydrogenation of CO …

Solid-Phase Synthesis Of Asymmetrically Substituted Phthalocyanines, Sultan Sibel Erdem

LSU Doctoral Dissertations

Phthalocyanines (Pcs) are excellent candidates for use as fluorophores for near-infrared (near-IR) fluorescent tagging of biomolecules and as photodynamic therapy (PDT) agents. Synthesis of Pcs with asymmetrical substitution on the periphery is often difficult due to the problems during the purification of the Pc mixtures obtained. The objective of this project is to design and synthesize chemically robust near-IR fluorophores for bioanalytical applications and to develop new synthetic methods for rapid synthesis of the target compounds. A novel synthetic route was developed utilizing a hydrophilic, polyethylene glycol-based (PEG) support with different types of linkers. The Pcs were functionalized with either …

A Longitudinal Study Of Married Women's Probability Of Being Housewives In Reforming Urban China, Chiung-Yin Hu

LSU Doctoral Dissertations

This study examines married women’s employment status and the factors associated with their being full-time housewives between 1989 and 2004 in urban China. I argue that the transition from a command economy to a market-oriented economy since the early 1980s has had negative impacts on married women’s labor force participation. Using six waves of the Chinese Health and Nutrition Survey (1989, 1991, 1993, 1997, 2000, and 2004), I find that the percentages of full-time housewives in urban China tripled in just 15 years, and the largest amount of growth occurred in the most recent period. Regression analyses confirm that married …

Elasto-Plastic And Damage Modeling Of Reinforced Concrete, Ziad N. Taqieddin

LSU Doctoral Dissertations

Modeling the mechanical behavior of Reinforced Concrete (RC) is still one of the most difficult challenges in the field of structural engineering. The Nonlinear Finite Element Analysis (NFEA) and modeling of the behavior of RC members are the primary goals of this study. The macroscopic components of RC, Concrete material and reinforcing steel, are represented herein by separate material models. These material models are combined together using a model that describes the global effect of interaction between reinforcing steel and concrete in order to simulate the behavior of the composite RC material. A thermodynamically consistent constitutive model for concrete that …

Internal Cooling In Ribbed Rectangular (Ar=4:1) Passages At High Rotation Numbers And Improvement In Finning Strategies, Fuguo Zhou

LSU Doctoral Dissertations

Experimental studies have been performed on two-pass rectangular internal coolant channels with aspect ratio AR 4:1 with high rotation numbers. Three passages are investigated: smooth, 90 deg ribbed and 45 deg ribbed. A maximum Reynolds number of 150,000 and a maximum rotation number of 0.6 are achieved in the study. These maximum parameter values are considerably higher than those previously reported for the 4:1 AR geometry, and provide data for parameter ranges that may be representative of certain modern turbine blades. Heat transfer behaviors with rotation in the three passages are presented. Rotation effects, density effects and buoyancy effects are …

Surgery Description Of Colored Knots, Steven Daniel Wallace

LSU Doctoral Dissertations

By a knot, or link, we mean a circle, or a collection of circles, embedded in the three-sphere S3. The study of knots is a very rich subject and plays a key role in the area of low-dimensional topology. In fact, a theorem of W.B.R. Lickorish and A.D. Wallace states that any three-dimensional manifold may be described by Dehn surgery along a link which is the process of removing the link from S3 and then gluing it back in a way that possibly changes the resulting manifold. In this dissertation, we will be interested in the pair (K, ρ) consisting …

Cause Of Hispanic Homicides In Major Metropolitan Areas, Michael Gregory Bisciglia

LSU Doctoral Dissertations

Research investigating the relationship between segregation and crime has been extensively examined in the literature. Although numerous studies have looked at segregation’s influence homicides, most have focused on African Americans. This study extends current research by focusing on Hispanic segregation and homicide victimization. Using a 236 city sample, homicides are shown to rise when Hispanics are segregated from Whites. In comparison, a 208 city sample finds that segregation also contributes to a rise in African American homicides. It was also expected that the more homogeneous Hispanic population would reduce homicides, but such an association was not present in the full …

The Anomaly Of Racial Variance In Female Perpetrated Spousal Killing: A Structural Explanation, Mark Melder

LSU Doctoral Dissertations

ABSTRACT Research investigating the relationship of structural factors to homicide abounds in the literature. There is also extant research on female perpetrated intimate partner killings (IPK). However this literature for the most part has examined the phenomenon itself, or has disaggregated the rates by race, where it was discovered that there is a racial anomaly in intimate killings, Black females kill their partners at a higher rate than White females. This research sought to determine how structural factors function to differentially amplify this rate, using classic controls for homicide and adding measures for the presence of female kin, the presence …

Academic Impropriety: Violation Of Normative Teaching Behaviors As Identified By Nursing Educators, Melanie Hilburn Green

LSU Doctoral Dissertations

With public criticism of American higher education on the rise, it is prudent for those in the academy to reflect upon their responsibilities to their students. Of particular salience is an examination of what constitutes misconduct within the faculty role. This dissertation reports the results of a study designed to identify what nursing educators believe to be the violation of normative teaching behaviors. A sequential explanatory mixed methods design was utilized to develop an understanding of the actions that constitute academic impropriety. The College Teaching Behaviors Inventory, a survey instrument designed by Braxton and Bayer (1999), was distributed to deans …

Assessing The Effectiveness Of The Response To Instruction Model For English Language Learners By Utilizing A Non-Language-Based Intervention, Chisato Komatsu

LSU Doctoral Dissertations

The purpose of the current investigation was to examine the use of the Response to Intervention (RTI) model for English Language learners (ELLs) by using a computerized constant time delay procedure (CTD) that de-emphasized the use of language. Forty-five ELLs, 22 native English speakers, and five students with a diagnosis of mild mental retardation participated in the study. A computer-administered CTD procedure was utilized for paired associate tasks. The study found differences and patterns in students’ performances that could be used to differentiate responders and non-responders to intervention. An interesting finding was that once the students were divided into groups …

The Perils And Empowerments Of Mountain Literacies: Reading Loss And Shifting Identities In Appalachian Memoirs And Novels, Erica Abrams Locklear

LSU Doctoral Dissertations

This dissertation analyzes the literary portrayal of literacy events in memoirs and novels written by Appalachian women during the twentieth and twenty-first centuries. Drawing from contemporary literacy scholarship, my project engages several definitions of the term "literacy," including theories defining it as a technical skill, a social act, cultural knowledge, or a potent form of ideological power. In a region historically (and often inaccurately) stigmatized as illiterate, "literacy" is a loaded term, a concept doubly associated with cultural pride and with cultural loss. By applying literacy theories to Appalachian literature, I analyze the identity conflicts literacy attainment causes for several …

The Reliability And Validity Of Screening Measures In Reading, James Albert Van Hook

LSU Doctoral Dissertations

National educational groups have recommended the use of universal screening to assist in the early identification of reading problems. One of the most widely used measures used for the universal screening of reading is oral reading fluency (ORF) (Fewster & Macmillan, 2002). However, ORF is somewhat time consuming to administer and has been reported to lack “face validity” with teachers (Fuchs, Fuchs & Maxwell, 1988). The purpose of this study was to investigate maze and other group-administered reading assessments because of their potential as a time efficient assessment that is as psychometrically valid as ORF. In this study, maze and …

Stochastic And Copula Models For Credit Derivatives, Chao Meng

LSU Doctoral Dissertations

We prove results relating to the exit time of a stochastic process from a region in N-dimensional space. We compute certain stochastic integrals involving the exit time. Taking a Gaussian copula model for the hitting time behavior, we prove several results on the sensitivity of quantities connected with the hitting times to parameters of the model, as well as the large-N behavior. We discuss the relationship of these results to certain credit derivative instruments. Relevant simulations are presented.

A Rhetoric Of Existentialism, Zachary Gershberg

LSU Doctoral Dissertations

Existentialism is often viewed as a morbid philosophy but adapting it to a rhetorical framework reveals a consistent interest in the ontological function of communication. The exchange of discourse and symbols is what ties humans together and existentialism examines the meaning that abounds in life as opposed to attempting to discover the meaning of life. As a rhetorical construct, existentialism provides a critical and unique view of agency and edification as a method of rhetorical practice.

Exploration Of New Ternary Gallides And Investigation Of Their Structure-Property Relationships, Jung Young Cho

LSU Doctoral Dissertations

This dissertation focuses on the investigation of new ternary intermetallic gallides, which may exhibit exotic physical properties such as heavy-fermion behavior, large magnetoresistance, and even superconductivity. In particular, the Ln-Cu-Ga (Ln = lanthanides) system has been systematically investigated by changing a reaction ratio and/or using a different temperature profile to optimize desired phases. Single crystals of Ln2MGa12 (Ln = La, Ce; M = Ni, Cu) have been synthesized using Ga flux and compared to their Pd analogues. Interestingly, Ce2MGa12 (M = Ni, Cu) show enhanced Sommerfeld coefficient of ¡Ö 191 mJmol-1K-2 and ¡Ö 69 mJmol-1K-2 for Ni and Cu compounds, …

Factors That Influence Traditional-Age College Students To Re-Enroll In Their Third Year At A Research Extensive University In The Southern Region Of The United States, Joseph M. Lutta

LSU Doctoral Dissertations

Student retention is of policy significance to higher education systems. In the United States, student retention is a major problem in higher education affecting students, universities, and society. Most of the research on student retention has focused on first-year students. Little is known about the retention of college students after their first year. The primary purpose of this study was to determine the influence of selected demographic and academic characteristics on the decision of traditional-age, undergraduate students to re-enroll at a research-extensive university. The population was defined as all traditional-age undergraduate students who entered the selected university during the fall …